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...w a heart that has completed all aspects of septation (atrial, ventricular and outflow tract). ...eart the atrial shunt (foramen ovale, or historically ''foramen Botalli'') and just outside the heart the pulmonary-aortic arch shunt (ductus arteriosus).

...of true embryonic stem cells capable of forming all cell types within the embryo. In mammals, the {{trophectoderm}} will form key cells ({{trophoblast}}) of ...3|'''Carnegie stage 3''']]. This stage is followed by blastocyst hatching and implantation.

...is on the overview of fetal respiratory development. Discussion of current and historic findings during the fetal development of the respiratory system wi ...s for gas exchange to occur, gas exchange is the removal of carbon dioxide and intake of oxygen into the lungs. Gas exchange is imperative for the functio

...ogy Series]]. The collection numbering also incorporated the Blechschmidt embryo collection (Carnegie Nos. 10315-10434 ) in 1972, the collection embryos hav ...collection that have been used in a variety of studies and links to images and information available on this current site.

[[File:Brain_ventricles_and_ganglia_development_03.jpg|thumb|Human brain and ventricular development imaged by MRI{{#pmid:20108226|PMID20108226}}]] ...t age embryos. There have been many studies of adult anatomical structures and also some of the placenta.

...re of transverse septum provides a support within which both blood vessels and liver begin to form in the underlying splanchnic {{mesoderm}}. ...r and heart grow rapidly forming obvious external swellings on the ventral embryo surface. The liver's initial embryonic function is mainly {{cardiovascular}

...two different spermatazoa) and '''monozygotic''' (from one fertilised egg and a single spermatazoa). Higher multiple pregnancies (triplets, quadruplets, ...al event(s) to occur in the first weeks following fertilisation. The later stages of monozygotic embryonic development may well follow the normal pattern of

...=Human embryo week 4 neural crest cells|Human embryo neural crest cells ([[Week 4]], Carnegie stage {{CS11}})]] ...t different rates along the embryo axis between Carnegie stage 11 to 13 in week 4.

...T system fetal development as well as the common fetal stage abnormalities and briefly list common abnormalities occurring in the embryonic stage. | Embryonic Period|| '''Week 4:'''

...). The breakdown of the germinal vesicle indicates a resumption of meiosis and the extrusion of the first {{polar body}} (1 PB) indicates completion of th ...and its follicle 1|1967 Oocyte EM]] | [[Paper - Cell-to-cell communication and ovulation - A study of the cumulus-oocyte complex|1978 Cumulus-oocyte compl

...rain and spinal cord) and neural crest (peripheral nervous system; sensory and sympathetic ganglia). Epidermis (integumentary, skin contribution) developm ...imation shows early neural development from week 3 onward. The whole early embryo development (dorsolateral view) is shown, yolk sac to left.

...hy Weber, in 1842, denied the presence of true lobules in the human liver, and one may himself doubt the appropriateness of the term 'lobule' for either t ...at the multiplication of lobules continues long after birth." The few late stages of the pig which I have been able to procure, consequently, have been of gr

...n.jpg|350px|right|thumb|The stages in sexual differentiation of the female and male reproductive system]] ...oetal developmental processes, exploring the current and historical models and understanding, alongside the congenital abnormalities.

...c weeks 3 through 10, deriving primarily from ectoderm, neural crest cells and mesenchyme. ...d finish with an examination of congenital abnormalities, current research and pending questions for the near future.

...tage16-17-limbs01.jpg|thumb|500px|Human embryonic limb development ([[week 6]])]] [[File:Stage20-23_limbs_b.jpg|thumb|500px|Human embryonic limb development ([[week 8]])]]

=Teratogenecity in the Setting of Cardiac Development and Maldevelopment= ..._.28Post_Fertilization.29_of_Susceptibility_to_a_Drug-Induced_Malformation|Table 2]].

.... Structurally, the seminiferous tubule epithelium is divided into a basal and an apical (adluminal) compartment by the blood–testis barrier (BTB). (Mor A second unique feature of this process is that during mitosis and meiosis the dividing cells remain connected by cytoplasmic bridges as the c

[[File:Week10 adrenal.jpg|thumb|300px|Human adrenal gland ([[Second_Trimester|Week 10]])]] ...form the majority of the “ductless” endocrine glands like gastrointestinal and skin associated “ducted” glands. Differentiation of several also organs

...dult cerebellum anatomy consists of three parts, the '''vermis''' (median) and the two '''hemispheres''' (lateral), which are continuous with each other. ...69,030,000,000 ± 6,650,000,000 (sixty-nine billion thirty million) neurons and 16,040,000,000 ± 2,170,000 other cell types.{{#pmid:26418466|PMID26418466}

[[File:Stage11 sem21.jpg|thumb|300px|Human embryo neural crest cells (stage {{CS11}})]] ...n, neural crest cells form the entire enteric nervous system, both neurons and glia, of the gastrointestinal tract.