Endocrine - Pituitary Development

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Introduction

Adult pituitary
Martin Heinrich Rathke (1793 – 1860)
Martin Heinrich Rathke (1793 – 1860)
Adult histology

Historically, this endocrine gland was called the "pituitary" as it was originally thought to produce mucous that discharged through the nose. We now know that this is not the function of the pituitary, or hypophysis is an endocrine gland links the brain to peripheral endocrine organs and systems of the body through several specific hormones. The developmental origin of the hypophysis is also unique, with dual epithelial origins from neural ectoderm (posterior) and from surface ectoderm (anterior).


During development, the boundary epitheilal ectoderm in the roof of the pharynx forms a pocket (Rathke's pouch) that comes into contact with the ectoderm of developing brain. Rathke's pouch is named after German embryologist and anatomist Martin Heinrich Rathke (1793 -1860).


Anatomically, the pituitary has 2 main parts posterior, or neurohypophysis and anterior, or adenohypophysis (the pars distalis, pars intermedia, and pars tuberalis). Between the two a specialized vascular (portal) system allows communication from the brain to peripheral endocrine organs and other systems.


Turkish saddle (17th century)

The pituitary is located within the pituitary fossa of the sphenoid bone, anterior to the lamina terminalis and superior to the pharynx. The shape of the bone surrounding the pituitary led to the naming sella turcica (Latin sella = saddle, turcica = Turkish), as it resembled a saddle shape.


Maternal pituitary also increases in size during pregnancy, due mainly to hyperplasia of the prolactin secreting cells (lactotrophs), in preparation for lactation after birth.


Endocrine Links: Introduction | BGD Lecture | Science Lecture | Pineal | Hypothalamus‎ | Pituitary | Thyroid | Parathyroid | Thymus‎ | Pancreas‎ | Adrenal‎ | Gonad‎ | Placenta‎ | Other Tissues | Stage 22 | Abnormalities | Hormones | Category:Endocrine
Historic Embryology - Endocrine  
1903 Islets of Langerhans | 1904 interstitial Cells | 1908 Pancreas Different Species | 1912 Suprarenal Bodies | 1914 Suprarenal Organs | 1915 Pharynx | 1916 Thyroid | 1918 Rabbit Hypophysis | 1935 Mammalian Hypophysis | 1926 Human Hypophysis | 1937 Pineal | 1938 Parathyroid | 1941 Thyroid | 1950 Thyroid Parathyroid Thymus
| Lecture - Head Development | Placodes

Some Recent Findings

  • β-catenin is required in the neural crest and mesencephalon for pituitary gland organogenesis[1] "The pituitary gland is a highly vascularized tissue that requires coordinated interactions between the neural ectoderm, oral ectoderm, and head mesenchyme during development for proper physiological function. ...mesenchyme on the rostral side of Rathke’s pouch is neural crest in origin. This rostral mesenchyme contributes to the vasculature of the pituitary gland."
  • Direct and indirect roles of Fgf3 and Fgf10 in innervation and vascularisation of the vertebrate hypothalamic neurohypophysis.[2] "The neurohypophysis is a crucial component of the hypothalamo-pituitary axis, serving as the site of release of hypothalamic neurohormones into a plexus of hypophyseal capillaries. The growth of hypothalamic axons and capillaries to the forming neurohypophysis in embryogenesis is therefore crucial to future adult homeostasis. Using ex vivo analyses in chick and in vivo analyses in mutant and transgenic zebrafish, we show that Fgf10 and Fgf3 secreted from the forming neurohypophysis exert direct guidance effects on hypothalamic neurosecretory axons. Simultaneously, they promote hypophyseal vascularisation, exerting early direct effects on endothelial cells that are subsequently complemented by indirect effects."
  • Genetic Regulation of Pituitary Gland Development in Human and Mouse[3] recent review article looking at molecular mechanisms of development.
More recent papers  
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Search term: Pituitary Embryology

Xin Wang, Qiu Du, Zhigang Mao, Xiang Fan, Bin Hu, Zhen Wang, Zhiyong Chen, Xiaobing Jiang, Zongming Wang, Ni Lei, Haijun Wang, Yonghong Zhu Combined treatment with artesunate and bromocriptine has synergistic anticancer effects in pituitary adenoma cell lines. Oncotarget: 2017; PubMed 28501857

Wang Zhen, Du Qiu, Chen Zhiyong, Wang Xin, Jian Mengyao, Zhu Dimin, Hu Chonghui, Wang Haijun, Zhu Yonghong MicroRNA-524-5p Functions as a Tumor Suppressor in a Human Pituitary Tumor-Derived Cell Line. Horm. Metab. Res.: 2017; PubMed 28472828

Nese Akcan, Nedime Serakıncı, Burcu Turkgenc, Ruveyde Bundak, Nerin Bahceciler, Sehime G Temel A Novel TBX19 Gene Mutation in a Case of Congenital Isolated Adrenocorticotropic Hormone Deficiency Presenting with Recurrent Respiratory Tract Infections. Front Endocrinol (Lausanne): 2017, 8;64 PubMed 28458651

Sezcan Mumusoglu, Baris Ata, Volkan Turan, Berfu Demir, Inci Kahyaoglu, Kiper Aslan, Ayse Seyhan Ata, Bulent Yilmaz, Kayhan Yakin, Berrin Avci, Gurkan Uncu, Gurkan Bozdag Does pituitary suppression affect live birth rate in women with congenital hypogonadotrophic hypogonadism undergoing intra-cytoplasmic sperm injection? A multicenter cohort study. Gynecol. Endocrinol.: 2017;1-5 PubMed 28447505

Filip Garbicz, Dawid Mehlich, Beata Rak, Emir Sajjad, Maria Maksymowicz, Wiktor Paskal, Grzegorz Zieliński, Paweł K Włodarski Increased expression of the microRNA 106b~25 cluster and its host gene MCM7 in corticotroph pituitary adenomas is associated with tumor invasion and Crooke's cell morphology. Pituitary: 2017; PubMed 28432562

Embryonic and fetal pituitary.jpg

Development Overview

  • Dual ectoderm origins
    • Ectoderm - ectoderm roof of stomodeum, Rathke's pouch, adenohypophysis
    • Neuroectoderm - prosenecephalon, neurohypophysis

Adenohypophysis

  • Anterior wall proliferates - pars distalis
  • Posterior wall little growth – pars intermedia
  • Rostral growth around infundibular stem – pars tuberalis

Neurohypophysis

  • Infundibulum – median eminence, infundibulum, pars nervosa

Pituitary development animation.gif


Red - surface ectoderm Blue - neural tube ectoderm

Pituitary Timeline

Embryonic and fetal pituitary.jpg
Human embryonic and fetal pituitary
  • Week 4 - hypophysial pouch, Rathke’s pouch, diverticulum from roof
  • Week 5 - elongation, contacts infundibulum, diverticulum of prosencephalon
  • Week 6 - connecting stalk between pouch and oral cavity degenerates
  • Week 10 - growth hormone and ACTH detectable
  • Week 16 - adenohypophysis fully differentiated
  • Week 20 to 24 - growth hormone levels peak, then decline

Embryo Development

Carnegie Stage 22

Developing Pituitary - Human embryo (Carnegie stage 22, week 8)

Stage 22 image 220.jpg Stage 22 image 221.jpg

Stage 22 image 204.jpg


Links: Image - Pituitary | Image - Pituitary Measured | Endocrine - Pituitary Development | Image - Low resolution Plane of Section | Image - Low resolution Pituitary

Carnegie Stage 23

The epithelium of the anterior lobe has become partly subdivided into lobule which project into the mesodermal component of the gland. The abundant vascular elements are well shown in figure 21.[4] Streeter1957 plate02.jpg

Fetal Pituitary

Fetal head section 03.jpg

Human Fetal Head (Week 12) - Pituitary

Pituitary Blood Vessel Development

Part of pituitary Arterial supply Systemic venous return Portal system return
Pars anterior and pars intermedia From carotid: a bilateral supply, usually one on each side, sometimes more than one Systemic veins to cavernous sinus following the course of the bilateral arteries Contribute blood to portal vessels
Pars tuberalis From circle of Willis by small branches around the outside of the stalk Small systemic veins corresponding to the arteries Contributes blood to the portal vessels
Pars posterior By branches from the bilateral supply from the carotids By small systemic venous branches following the course ofthe arterial twigs Contributes blood to the portal vessels by fine channels opening into them below their heavy glial sleeves
       


pars distalis - vascularized by hypophysial portal vessels

A study in rats has identified the role of a known regulator of blood vessel development (Vascular Endothelial Growth Factor, VEGF) in the development of the pituitary portal vascular system.[5] "The primary capillaries extended along the developing pars tuberalis, whereas the portal vessels penetrated into the pars distalis at E15.5 (rat) and subsequently expanded into the lobe to connect with the secondary capillary plexus, emerging in the pars distalis. ....study suggests that VEGF-A (Vascular Endothelial Growth Factor A) is involved in the development of the primary capillaries and in the vascularization of the pars distalis, but not in the portal vessels since the formation of portal vessels begins at E13.5 (rat), before the appearance of VEGF-A in the rostral region of the pars distalis."

The pars distalis is vascularized by hypophysial portal vessels that arise from the capillary beds in the median eminence of the hypothalamus (Murakami et al. 1987), and this hypophyseal portal system provides an important link for carrying hormonal information from the central nervous system to the pituitary. The capillaries of the pituitary gland are characterized by richly fenestrated endothelia.

Hypothalamus Endocrine Axes

Links: Image - HPA | Hypothalamus | Pituitary | Adrenal | Image - HPT Axis | Thyroid | Image - HPG female | Image - HPG male | Gonad

Hypothalamus

The hypothalamus is a small region located within the brain that controls many bodily functions, including eating and drinking, sexual functions and behaviors, blood pressure and heart rate, body temperature maintenance, the sleep-wake cycle, and emotional states (e.g., fear, pain, anger, and pleasure). Hypothalamic hormones play pivotal roles in the regulation of many of those functions. Because the hypothalamus is part of the central nervous system, the hypothalamic hormones actually are produced by nerve cells (i.e., neurons).

Hypothalamus

Pituitary

The anterior pituitary produces several important hormones that either stimulate target glands (e.g., the adrenal glands, gonads, or thyroid gland) to produce target gland hormones or directly affect target organs. The pituitary hormones include adreno-corticotropic hormone (ACTH); gonadotropins; thyroid-stimulating hormone (TSH), also called thyrotropin; growth hormone (GH); and prolactin.

The first three of those hormones (ACTH, gonadotropins, and TSH) act on other glands.

  • ACTH stimulates the adrenal cortex to produce corticosteroid hormones (primarily cortisol) as well as small amounts of female and male sex hormones.
  • Gonadotropins comprise two molecules, luteinizing hormone (LH) and follicle-stimulating hormone (FSH). These two hormones regulate the production of female and male sex hormones in the ovaries and testes as well as the production of the germ cells (oocyte and spermatozoa).
  • TSH stimulates the thyroid gland to produce and release thyroid hormone.

The remaining two pituitary hormones, GH and prolactin, directly affect their target organs.

Pituitary

Hormones

Follicle Stimulating Hormone

(Follicle-stimulating hormone, FSH) produced in the anterior pituitary (adenohypophysis) by basophil cell gonadotropes. This glycoprotein hormone postnatally during puberty acts on the gonads (testis and ovary) to regulate fertility. FSH at the cellular level binds the membrane follicle-stimulating hormone receptor (FSH receptor, FSHR), a G protein-coupled receptor (GPCR)/seven-transmembrane domain receptor.

  • testis - sertoli cell
  • ovary - granulosa cell

Luteinizing Hormone

(lutropin, lutrophin, LH) produced in the anterior pituitary (adenohypophysis) by basophil cell gonadotropes. LH at the cellular level binds the membrane luteinizing hormone receptor (LH receptor, LHR), a G protein-coupled receptor (GPCR)/seven-transmembrane domain receptor.

  • testis - Leydig cell
  • ovary - theca cell

Postnatal

Postnatal thyrotropin levels graph.jpg

Postnatal thyrotropin (TSH) levels[6]

Links: Neonatal_Development | Puberty Development

Sexual Dimorphism

Quantitation of the human pituitary by magnetic resonance imaging (MRI) from childhood through puberty has identified volmetric differences between male and female pituitary sizes between 14 to 17 years of age.[7]

  • Females had larger pituitary glands than males in the age 14 to 17 year old groups.
  • Young (19 years and under) and old (20 years and older) females demonstrated a correlation between pituitary volume and age.
  • Males did not show this relationship.

Adult Histology

Adenohypophysis

  • Acidophils - cytoplasm that stains red or orange
    • polypeptide hormones: Somatotropes, produce growth hormone; Lactotropes produce prolactin)
  • Basophils - cytoplasm that stains a bluish colour
    • glycoprotein hormones: Thyrotropes produce thyroid stimulating hormone; Gonadotropes produce luteinizing hormone or follicle-stimulating hormone; Corticotropes produce adrenocorticotrophic hormone)
  • Chromophobes - cytoplasm that stains very poorly
  • acidophils or basophils that are degranulated and depleted of hormone

Pituitary histology 001.jpg Pituitary histology 002.jpg

Neurohypophysis

  • Infundibular process - usually referred to as posterior pituitary (unmyelinated axons from hypothalamic neurosecretory neurons, supraoptic and paraventricular hypothalamic nuclei)
    • 2 other parts: median eminence and infundibular stalk

Pituitary histology 003.jpg Pituitary histology 004.jpg


Links: Pituitary - neurohypophysis (large histology image)

Molecular

  • Pituitary development: regulatory codes in mammalian organogenesis.[8] "During mammalian pituitary gland development, distinct cell types emerge from a common primordium. Appearance of specific cell types occurs in response to opposing signaling gradients that emanate from distinct organizing centers. These signals induce expression of interacting transcriptional regulators, including DNA binding-dependent activators and DNA binding-independent transrepressors, in temporally and spatially overlapping patterns. Together they synergistically regulate precursor proliferation and induction of distinct cell types. Terminal cell type differentiation requires selective gene activation strategies and long-term active repression, mediated by cell type-specific and promoter-specific recruitment of coregulatory complexes. These mechanisms imply the potential for flexibility in the ultimate identity of differentiated cell types."
  • Pax6 is essential for establishing ventral-dorsal cell boundaries in pituitary gland development.[9] "The transcription factor Pax6 (paired homeodomain) has been shown to be expressed transiently in the dorsal portion of the developing pituitary before the ventral/dorsal appearance of specific cell types. Transient dorsal expression of Pax6 could establish the boundary between dorsal and ventral cell types, based on the inhibition of Shh ventral signals."

Genes

Pit1 (pituitary-specific transcription factor) is a transcription factor important for pituitary development and muations in this gene can lead to abnormalities in pituitary development and hormone production.

  • PIT1 Pituitary-Specific Transcription Factor 1 - transcription factor responsible for pituitary development and hormone expression in mammals. OMIM 173110 | Gene Map Locus: 3p11 | is a pituitary-specific transcription factor responsible for pituitary development and hormone expression in mammals and is a member of the POU family of transcription factors that regulate mammalian development.
  • PitX1 Paired-Like Homeodomain Transcription Factor 1 - transcription factor expressed in pituitary primordium. Member of bicoid-related vertebrate homeobox genes. OMIM 602149 | Gene Map Locus: 5q31
  • PitX2 Paired-Like Homeodomain Transcription Factor 2 - transcription factor expressed in pituitary primordium and other anterior structures, including the eye Member of bicoid-related vertebrate homeobox genes. OMIM 601542 | Gene Map Locus: 4q25-q26
  • VEGF Vascular Endothelial Growth Factor - mitogen growth factor for vascular endothelial cells. Role in pituitary vascular development. OMIM 192240 | Gene Map Locus: 1q23-q24

Abnormalities

Anatomical abnormalities asssociated with the Rathke's pouch include a craniopharyngeal canal, from the anterior part of the fossa hypophyseos of the sphenoid bone to the under surface of the skull. The stomodeal end may also be present at the junction of the septum of the nose with the palate.

Abnormal functional development of the pituitary can lead to a wide range of other organ diseases due to the effect of hormones released from the pituitary on many other endocrine and non-endocrine organs (For example: dwarfism, hypothyroidism). (More? NIH Genes and Disease Chapter 41 - Endocrine)

Pituitary Duplication

Occurring as either a complete or partial duplication, this is an extremely rare abnormality with poor neonatal survival due to associated abnormalities. [10] Recently a heterozygous deletion of chromosome 14, including the thyroid transcription factor-1 gene, has been identified with duplication of the pituitary stalk.[11]

Pituitary Adenoma Classification

There are several abnormalities associated with abnormal levels of the hormonal output of the pituitary due to the development of pituitary tumours (adenomas).

Growth hormone (GH) adenoma

Growth hormone (GH) adenomas, which are benign pituitary tumors lead to chronic high GH output levels, that may lead to acromegaly in adults and gigantism in children.

Acromegaly (Greek, acro = "extremities"; megaly = "enlargement") is a clinical term for a hormonal disorder that results from excess growth hormone (GH) in the body. The pituitary produces excessive amounts of growth hormone, usually due to benign, or noncancerous, pituitary tumours (adenomas). Childhood adenomas lead to gigantism rather than acromegaly, due to continued and excess growth in the still unfused growth plates in the long bones of the legs.

Links: NIH - acromegaly

Adrenocorticotropic (ACTH) adenoma

Cushing's disease caused either by a pituitary adenoma produces excess adrenocorticotropic hormone (ACTH, corticotropin) or due to ectopic tumors secreting ACTH or corticotropin-releasing hormone (CRH). Classification can be applied using specific criteria (clinical presentation, biochemical data, histology of growth pattern, tinctorial characteristics, proliferative activity, immunohistology marker expression, ultrastructure and molecular biology). The current classification used is the World Health Organization classification of 2000 recently updated in 2004.

Links: NIH - cushings

Syndromic Hypopituitarism

Combined Pituitary Hormone Deficiency

TBX19 and ACTH Deficiency

References

  1. Shannon W Davis, Amanda H Mortensen, Jessica L Keisler, Amanda L Zacharias, Philip J Gage, Ken-Ichi Yamamura, Sally A Camper β-catenin is required in the neural crest and mesencephalon for pituitary gland organogenesis. BMC Dev. Biol.: 2016, 16(1);16 PubMed 27184910
  2. Fang Liu, Hans-Martin Pogoda, Caroline Alayne Pearson, Kyoji Ohyama, Heiko Löhr, Matthias Hammerschmidt, Marysia Placzek Direct and indirect roles of Fgf3 and Fgf10 in innervation and vascularisation of the vertebrate hypothalamic neurohypophysis. Development: 2013, 140(5);1111-22 PubMed 23404108
  3. Daniel Kelberman, Karine Rizzoti, Robin Lovell-Badge, Iain C A F Robinson, Mehul T Dattani Genetic regulation of pituitary gland development in human and mouse. Endocr. Rev.: 2009, 30(7);790-829 PubMed 19837867 | Endocr Rev.
  4. Streeter GL. Developmental Horizons In Human Embryos Description Or Age Groups XIX, XX, XXI, XXII, And XXIII, Being The Fifth Issue Of A Survey Of The Carnegie Collection. (1957) Carnegie Instn. Wash. Publ. 611, Contrib. Embryol., 36: 167-196.
  5. Takashi Nakakura, Mayumi Yoshida, Hideo Dohra, Masakazu Suzuki, Shigeyasu Tanaka Gene expression of vascular endothelial growth factor-A in the pituitary during formation of the vascular system in the hypothalamic-pituitary axis of the rat. Cell Tissue Res.: 2006, 324(1);87-95 PubMed 16411082
  6. | BMC Endocr Disord.
  7. Frank P MacMaster, Matcheri Keshavan, Yousha Mirza, Normand Carrey, Ameet R Upadhyaya, Rhonda El-Sheikh, Christian J Buhagiar, S Preeya Taormina, Courtney Boyd, Michelle Lynch, Michelle Rose, Jennifer Ivey, Gregory J Moore, David R Rosenberg Development and sexual dimorphism of the pituitary gland. Life Sci.: 2007, 80(10);940-4 PubMed 17174342 | PMC1853319
  8. Kathleen M Scully, Michael G Rosenfeld Pituitary development: regulatory codes in mammalian organogenesis. Science: 2002, 295(5563);2231-5 PubMed 11910101
  9. C Kioussi, S O'Connell, L St-Onge, M Treier, A S Gleiberman, P Gruss, M G Rosenfeld Pax6 is essential for establishing ventral-dorsal cell boundaries in pituitary gland development. Proc. Natl. Acad. Sci. U.S.A.: 1999, 96(25);14378-82 PubMed 10588713
  10. S S Kollias, W S Ball, E C Prenger Review of the embryologic development of the pituitary gland and report of a case of hypophyseal duplication detected by MRI. Neuroradiology: 1995, 37(1);3-12 PubMed 7708185
  11. S Accornero, C Danesino, S Bastianello, I D'Errico, A Guala, L Chiovato Duplication of the pituitary stalk in a patient with a heterozygous deletion of chromosome 14 harboring the thyroid transcription factor-1 gene. J. Clin. Endocrinol. Metab.: 2010, 95(8);3595-6 PubMed 20685887

Online Textbooks

Endocrinology: An Integrated Approach Nussey, S.S. and Whitehead, S.A. Oxford, UK: BIOS Scientific Publishers, Ltd; 2001. table of Contents | The pituitary gland | Embryology of the pituitary gland | Blood supply of the hypothalamo-pituitary axis

NIH Genes & Disease Chapter 41 - Endocrine

Developmental Biology (6th ed) Gilbert, Scott F. Sunderland (MA): Sinauer Associates, Inc.; c2000.

Stages along the hypothalamus-pituitary-thyroid axis of salamanders

Molecular Biology of the Cell (4th Edn) Alberts, Bruce; Johnson, Alexander; Lewis, Julian; Raff, Martin; Roberts, Keith; Walter, Peter. New York: Garland Publishing; 2002. table 15-1. Some Hormone-induced Cell Responses Mediated by Cyclic AMP | Alternative processing pathways for the prohormone proopiomelanocortin

Clinical Methods (3rd Edn) Walker, H.K.; Hall, W.D.; Hurst, J.W.; editors Stoneham (MA). Tests of Pituitary or Target Gland Dysfunction | Pituitary Tumors

Health Services/Technology Assessment Text (HSTAT) Bethesda (MD): National Library of Medicine (US), 2003 Oct. Pituitary Gland search Results

Search NLM Online Textbooks- "pituitary development" : Endocrinology | Molecular Biology of the Cell | The Cell- A molecular Approach

Reviews

Giuseppe Musumeci, Sergio Castorina, Paola Castrogiovanni, Carla Loreto, Rosi Leonardi, Flavia Concetta Aiello, Gaetano Magro, Rosa Imbesi A journey through the pituitary gland: Development, structure and function, with emphasis on embryo-foetal and later development. Acta Histochem.: 2015; PubMed 25858531

Daniel Kelberman, Karine Rizzoti, Robin Lovell-Badge, Iain C A F Robinson, Mehul T Dattani Genetic regulation of pituitary gland development in human and mouse. Endocr. Rev.: 2009, 30(7);790-829 PubMed 19837867

M G Rosenfeld, P Briata, J Dasen, A S Gleiberman, C Kioussi, C Lin, S M O'Connell, A Ryan, D P Szeto, M Treier Multistep signaling and transcriptional requirements for pituitary organogenesis in vivo. Recent Prog. Horm. Res.: 2000, 55;1-13; discussion 13-4 PubMed 11036930

H Z Sheng, H Westphal Early steps in pituitary organogenesis. Trends Genet.: 1999, 15(6);236-40 PubMed 10354584

C Kioussi, C Carrière, M G Rosenfeld A model for the development of the hypothalamic-pituitary axis: transcribing the hypophysis. Mech. Dev.: 1999, 81(1-2);23-35 PubMed 10330482


Articles

Takashi Nakakura, Mayumi Yoshida, Hideo Dohra, Masakazu Suzuki, Shigeyasu Tanaka Gene expression of vascular endothelial growth factor-A in the pituitary during formation of the vascular system in the hypothalamic-pituitary axis of the rat. Cell Tissue Res.: 2006, 324(1);87-95 PubMed 16411082

C Kioussi, S O'Connell, L St-Onge, M Treier, A S Gleiberman, P Gruss, M G Rosenfeld Pax6 is essential for establishing ventral-dorsal cell boundaries in pituitary gland development. Proc. Natl. Acad. Sci. U.S.A.: 1999, 96(25);14378-82 PubMed 10588713

M Treier, S O'Connell, A Gleiberman, J Price, D P Szeto, R Burgess, P T Chuang, A P McMahon, M G Rosenfeld Hedgehog signaling is required for pituitary gland development. Development: 2001, 128(3);377-86 PubMed 11152636


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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Frazer JE. Pharyngeal end of Rathke's pouch. (1911) J Anat., 45: 190-196. PMID 17232879

Streeter GL. Developmental Horizons In Human Embryos Description Or Age Groups XIX, XX, XXI, XXII, And XXIII, Being The Fifth Issue Of A Survey Of The Carnegie Collection. (1957) Carnegie Instn. Wash. Publ. 611, Contrib. Embryol., 36: 167-196.

Terms

  • adenohypophyseal placode - Specialised cranial surface ectoderm placode region that will form the endocrine anterior pituitary (adenohypophysis).
  • adenohypophysis - (anterior pituitary, pars anterior) The anterior part of the pituitary, which develops in the early embryo from the surface ectoderm adenohypophyseal placode. This placode will fold inward on the roof of the pharynx forming a transient structure Rathke's pouch, that looses its connection with the surface.
  • anterior pituitary - (adenohypophysis, pars anterior, pars distalis)
  • neurohypophysis - (posterior pituitary)
  • pars tuberalis - (pars tuberalis of the hypophysis) anatomically is the region of anterior pituitary (adenohypophysis) extending along the anterior and lateral surfaces of the hypophyseal stalk. Tuberalis principal cells are low columnar, with cytoplasm containing lipid droplets, glycogen granules, and some colloid droplets.
  • posterior pituitary - (neurohypophysis)
  • Rathke's pouch - An ectodermal fold in roof of pharynx forming anterior pituitary (adenohypophysis) and pars intermedia. Named after German embryologist and anatomist Martin Heinrich Rathke (1793 -1860). (More? Martin Heinrich Rathke)


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Cite this page: Hill, M.A. 2017 Embryology Endocrine - Pituitary Development. Retrieved May 24, 2017, from https://embryology.med.unsw.edu.au/embryology/index.php/Endocrine_-_Pituitary_Development

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