Talk:Renal System - Carnegie Stage 22

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UNSW Embryology

Development of the Kidney and Reproduction Systems

© Dr Mark Hill (2010)

[../People.htm Acknowledgements]

Stage 22 Urogenital 3D Model

The individual serial slices have also been incorporated into a 3D model of this embryo [UG3dmodelst22.htm Urogenital System].

Stage 22 Embryo (Human) Urinary System

[../wwwhuman/lowpower/HumE/E6L.htm E6]: R,L adrenal glands under diaphragm.

[../wwwhuman/lowpower/HumE/E7L.htm E7]: Large adrenal glands. Inferior vena cava. Thoracic aorta.

File:Hf1.gif File:Hf2.gif File:Hf3.gif
[../wwwhuman/lowpower/HumF/F1L.htm Fl]: Adrenal glands. R. Kidney. Autonomic ganglia (partly the adrenal medulla precursors). [../wwwhuman/lowpower/HumF/F2L.htm F2]: Kidneys (note retroperitoneal location). Cortex. Medulla. L. Adrenal gland. Superior mesenteric artery. Inferior vena cava. [../wwwhuman/lowpower/HumF/F3L.htm F3]: R testis (note its location relative to the R adrenal). L adrenal. R renal hilus. large channels are branches of ureteric tree.
File:Hf4.gif File:Hf5.gif File:Hf6.gif File:Hf7.gif
[../wwwhuman/lowpower/HumF/F4L.htm F4]: R kidney and R ureter. Inferior vena cava. L. kidney, L renal hilus and L ureter. R testis with R mesonephric duct (precursor of vas deferens). L testis. Umbilical arteries passing into umbilical cord allantois between them. [../wwwhuman/lowpower/HumF/F5L.htm F5]: Kidneys. Ureters. Note umbilical arteries and allantois. Also note how R testis and mesonephric structures are attached to parietal peritoneum by a mesogonad. [../wwwhuman/lowpower/HumF/F5L.htm F6]: Kidneys. Ureters. Note umbilical arteries and allantois. Also note how R testis and mesonephric structures are attached to parietal peritoneum by a mesogonad. [../wwwhuman/lowpower/HumF/F7L.htm F7]: In F7, (dorsal to R testis and liver) note with the distinct lumen of the mesonephric duct, almost solid column of paramesonephric cells and remnants of mesonephric tubules. "mesogonad". Ureters. Bladder with submucosa and detrusor muscle. Umbilical arteries. Division of aorta.
File:Hg1.gif File:Hg2.gif File:Hg3.gif File:Hg4.gif
[../wwwhuman/lowpower/HumG/G1L.htm G1]: Ureters, Bladder. Umbilical arteries. Testis with remains of mesonephros (dorsal), mesonephric duct and paramesonephric cells. Sigmoid colon and mesocolon. [../wwwhuman/lowpower/HumG/G2L.htm G2]: Ureters being displaced ventrally, crossing common iliac arteries. Sigmoid colon. Bladder. Mesonephric ducts (lateral) and paramesonephric ducts (smaller, medial) located dorsal to bladder. [../wwwhuman/lowpower/HumG/G3L.htm G3]: Ureters (cut twice): descending dorsal to bladder and ascending ventrally to enter the bladder at trigone, through the submucosa). Fusion of paramesonephric ducts. Paired mesonephric ducts. Umbilical arteries looping off common iliac arteries. Pubic symphysis. Colon. [../wwwhuman/lowpower/HumG/G4L.htm G4]: Most caudal part of loop of ureters. Urethra emerging from bladder. Mesonephric ducts. Rectocolic junction.
File:Hg5.gif File:Hg6.gif File:Hg7.gif
[../wwwhuman/lowpower/HumG/G5L.htm G5]: Urethra (in region of future prostate gland - note crescentic shape). Rectum. Rectovesical pouch. Between G4 and G5, each mesonephric duct (vas deferens) has joined the prostatic urethra (caudal to the ureters), thereby increasing the caliber of the latter. [../wwwhuman/lowpower/HumG/G6L.htm G6]: Penile urethra, emerging inferiorly to the glans penis. Scrotal swellings (appear before testis descends). [../wwwhuman/lowpower/HumG/G6L.htm G7]: Penile urethra, emerging inferiorly to the glans penis. Scrotal swellings (appear before testis descends). Note F7 MS term: "inebriated Puffin" (dorsal to R testis and liver) lumen of the mesonephric duct (eye), almost solid column of paramesonephric cells (beak) and remnants of mesonephric tubules (body).

 


Stage 22 Embryo (Human) Genital System (Male) ([#Female also see Female])
File:Hf3.gif File:Hf4.gif File:Hf5.gif File:Hf6.gif
[../wwwhuman/lowpower/HumF/F3L.htm F3]: R testis with thick tunica albuginea (pale) and thin urogenital mesentery.Note spleen on L. [../wwwhuman/lowpower/HumF/F4L.htm F4]: Testes. Narrow urogenital mesentery. Remains of mesonephric tubules near hilus (future efferent ductules at mediastinum testis). [../wwwhuman/lowpower/HumF/F5L.htm F5]: Broader urogenital mesentery on R (still narrow on L). [../wwwhuman/lowpower/HumF/F6L.htm F6]: On R: Remnants of mesonephric tubules (primordia of ductuli efferentes). Mesonephric duct (origin of vas deferens). Laterally, the paramesonephric duct (primordia of appendix testis). Note abdominal location of testes in relation to adjacent structures.
File:Hf7.gif File:Hg1.gif File:Hg2.gif File:Hg3.gif
[../wwwhuman/lowpower/HumF/F7L.htm F7]: Developing efferent ductules, mesonephric duct and medially, the paramesonephric duct (appearing solid). Note how the paramesonephric duct crossed the mesonephric duct ventromedially. Urogenital mesentery - note how testis is attached to the developing efferent ductules by a separate narrow flange,the mesorchium. [../wwwhuman/lowpower/HumG/G1L.htm G1]: On R: Lateral mesonephric duct and medial paramesonephric groove. (Changing from a tube to a groove). On L: testis (lower than on R), mesonephric tubules, mesonephric duct (lateral), paramesonephric duct (ventromedial - appearing solid).Bladder. Umbilical arteries. Sigmoid colon and mesocolon. [../wwwhuman/lowpower/HumG/G1L.htm G2]: Transition from abdominal cavity to superior pelvis. note iliac crest, femoral nerve, psoas major muscle, internal iliac vein and artery. Medial convergence of paramesonephric cords and more laterally-located mesonephric ducts, ventral to the colon and dorsal to the bladder. Note position of ureters. N.B. Testis lies above this level which is close to the plane of the future inguinal canal. [../wwwhuman/lowpower/HumG/G3L.htm G3]: Transition from superior (major) pelvis to inferior (minor) pelvis. Rectovesical pouch. Note wide expanse of loose tissue ventral to the pubic symphysis: site of testicular descent.
File:Hg4.gif File:Hg5.gif File:Hg6.gif File:Hg7.gif
[../wwwhuman/lowpower/HumG/G3L.htm G4]: Transition from superior (major) pelvis to inferior (minor) pelvis. Rectovesical pouch. Note wide expanse of loose tissue ventral to the pubic symphysis: site of testicular descent. External genitalia (male)[../wwwhuman/lowpower/HumG/G5L.htm G5]: Minor pelvis. Obturator foramen. Ischium. Head of femur. Acetabulum. Ganglion cells of pelvis plexus. Obturator externus muscle. Urogenital sinus (the caudal enlargement is due to junction of mesonephric ducts). [../wwwhuman/lowpower/HumG/G6L.htm G6]:Level of pelvic floor. Pelvic plexus. Recto-anal junction. Ischium. obturator internus muscle. Greater sciatic notch. Alar of sacrum. Sacro-iliac joint. [../wwwhuman/lowpower/HumG/G6L.htm G7]: Urethra opening ventrally. Genital tubercle (embryonic glans penis).

Stage 22 Embryo (Human)

File:St22sm.gif
[../wwwhuman/lowpower/HumA/A1L.htm A1] [../wwwhuman/lowpower/HumA/a2l.htm A2] [../wwwhuman/lowpower/HumA/a3l.htm A3] [../wwwhuman/lowpower/HumA/a4l.htm A4] [../wwwhuman/lowpower/HumA/a5l.htm A5] [../wwwhuman/lowpower/HumA/a6l.htm A6] [../wwwhuman/lowpower/HumA/a7l.htm A7]
[../wwwhuman/lowpower/HumB/b1l.htm B1] [../wwwhuman/lowpower/HumB/b2l.htm B2] [../wwwhuman/lowpower/HumB/b3l.htm B3] [../wwwhuman/lowpower/HumB/b4l.htm B4] [../wwwhuman/lowpower/HumB/b5l.htm B5] [../wwwhuman/lowpower/HumB/b6l.htm B6] [../wwwhuman/lowpower/HumB/b7l.htm B7]
[../wwwhuman/lowpower/HumC/c1l.htm C1] [../wwwhuman/lowpower/HumC/c2l.htm C2] [../wwwhuman/lowpower/HumC/c3l.htm C3] [../wwwhuman/lowpower/HumC/c4l.htm C4] [../wwwhuman/lowpower/HumC/c5l.htm C5] [../wwwhuman/lowpower/HumC/c6l.htm C6] [../wwwhuman/lowpower/HumC/c7l.htm C7]
[../wwwhuman/lowpower/humd/d1l.htm D1] [../wwwhuman/lowpower/humd/d2l.htm D2] [../wwwhuman/lowpower/humd/d3l.htm D3] [../wwwhuman/lowpower/humd/d4l.htm D4] [../wwwhuman/lowpower/humd/d5l.htm D5] [../wwwhuman/lowpower/humd/d6l.htm D6] [../wwwhuman/lowpower/humd/d7l.htm D7]
[../wwwhuman/lowpower/HumE/e1l.htm E1] [../wwwhuman/lowpower/HumE/e2l.htm E2] [../wwwhuman/lowpower/HumE/e3l.htm E3] [../wwwhuman/lowpower/HumE/e4l.htm E4] [../wwwhuman/lowpower/HumE/e5l.htm E5] [../wwwhuman/lowpower/HumE/e6l.htm E6] [../wwwhuman/lowpower/HumE/e7l.htm E7]
[../wwwhuman/lowpower/HumF/f1l.htm F1] [../wwwhuman/lowpower/HumF/f2l.htm F2] [../wwwhuman/lowpower/HumF/f3l.htm F3] [../wwwhuman/lowpower/HumF/f4l.htm F4] [../wwwhuman/lowpower/HumF/f5l.htm F5] [../wwwhuman/lowpower/HumF/f6l.htm F6] [../wwwhuman/lowpower/HumF/f7l.htm F7]
[../wwwhuman/lowpower/HumG/g1l.htm G1] [../wwwhuman/lowpower/HumG/g2l.htm G2] [../wwwhuman/lowpower/HumG/g3l.htm G3] [../wwwhuman/lowpower/HumG/g4l.htm G4] [../wwwhuman/lowpower/HumG/g5l.htm G5] [../wwwhuman/lowpower/HumG/g6l.htm G6] [../wwwhuman/lowpower/HumG/g7l.htm G7]

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EmailCopyright: Dr Mark HillCreated: 01.06.1997Updated:#BeginDate format:Ge1 14.04.2009#EndDate-> UNSW CRICOS Provider Code No. 00098G

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Comments

Mhicon08.jpg

The kidney goes through several stages of development before establishing the mature kidney.

The functional unit of the kidney, the nephron, develops through a classical epithelial/mesenchyme type of interaction.

The gonads have quite different origins and developmental features, but are closely physically associated. A new more specific section of notes is being developed covering [genital.htm male and female gonad and genital development].

Please email Dr Mark Hill if you wish to make a comment about this current project.©M.A. Hill, 2007