File:Keibel Mall 2 604.jpg

Fig. 604 a and b. Model of the cloacal region of a human embryo of 11 mm greatest length

(Embryo P. I., from the collection of Professor Hochstetter, Vienna.)

Model prepared by my pupil Frau Gervai. a, From the right side; b, median sagittal section.

The rectum is completely separated from the ventral remains of the cloaca, and the cloacal membrane has been divided into the canal and urogenital membranes. The ventral remains of the cloaca has changed its position in that it has been drawn dorsally by the ureters and primary excretory ducts as a result of the enlargement of the dorso-ventral diameter of the body cavity. Thereby its former dorsal wall — compare Fig. 603 — is divided into a ventral and a cranial portion, the former being formed by the urogenital membrane and the latter by what was termed in Fig. 603 the newly formed ventral cloacal wall. The cranial wall is depressed caudally in its middle part. Thus the ventral remains of the cloaca is divided into three portions: into, 1, the vesico-urethral anlage, the dorsal portion, 2, the pars pelvina of the urogenital sinus, the middle narrow portion, and, 3, the pars phallica of the urogenital sinus, the ventral broad portion; the latter is closed externally by the urogenital membrane.

Embryology - 27 Apr 2024        Expand to Translate
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Felix W. The development of the urinogenital organs. In Keibel F. and Mall FP. Manual of Human Embryology II. (1912) J. B. Lippincott Company, Philadelphia. pp 752-979.

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Cite this page: Hill, M.A. (2024, April 27) Embryology Keibel Mall 2 604.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_2_604.jpg

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