File:Bailey308.jpg: Difference between revisions

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Fig. 308. Human embryo of 5 weeks

The ventral body wall has been removed to disclose the mesonephroi. (Kollmann)

The primary mesonephric tubules are arranged segmentally, one appearing in each segment as far back as the pelvic region. Thus the intermediate cell mass may be considered as a series of nephrotomes, corresponding to the sclerotomes and myotomes. The segmental character is soon lost, however, owing to the inequality of growth between the mesonephros and the other segmental structures, and to the development of the secondary and tertiary tubules. As stated above, the first mesonephric tubules appear immediately caudal to the pronephros From this point their formation gradually progresses in a caudal direction as far as the pelvic region. By the further development of the primary and by the addition of the secondary and tertiary tubules and the glomeruli, the mesonephros as a whole increases in size and forms a large structure which projects into the ccelom on each side of the body, forming the so-called mesonephric or Wolffian ridge. It reaches the height of its development in the human embryo about the fifth or sixth week, at which time it extends from the region of the heart to the pelvic region (Fig. 308). Each organ is attached to the dorsal body wall by a distinct mesentery which, at its cephalic end, also sends off a band to the diaphragm the diaphragmatic ligament of the mesonephros.

The peritoneum is reflected over the surface of the mesonephros, and on the ventro-medial side the mesothelium becomes thickened to form the genital ridge (Figs. 276 and 308).

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Reference

Bailey FR. and Miller AM. Text-Book of Embryology (1921) New York: William Wood and Co.

Cite this page: Hill, M.A. (2024, April 19) Embryology Bailey308.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey308.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	11:13, 25 January 2011		791 × 848 (88 KB)	S8600021 (talk \| contribs)	{{Template:Bailey 1921 Figures}} Category:Human Category:Coelom Category:Genital

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+==Fig. 308. Human embryo of 5 weeks==
+The ventral body wall has been removed to disclose the mesonephroi. (Kollmann)
+The primary mesonephric tubules are arranged segmentally, one appearing in each segment as far back as the pelvic region. Thus the intermediate cell mass may be considered as a series of nephrotomes, corresponding to the sclerotomes and myotomes. The segmental character is soon lost, however, owing to the inequality of growth between the mesonephros and the other segmental structures, and to the development of the secondary and tertiary tubules. As stated above, the first mesonephric tubules appear immediately caudal to the pronephros From this point their formation gradually progresses in a caudal direction as far as the pelvic region. By the further development of the primary and by the addition of the secondary and tertiary tubules and the glomeruli, the mesonephros as a whole increases in size and forms a large structure which projects into the ccelom on each side of the body, forming the so-called mesonephric or Wolffian ridge. It reaches the height of its development in the human embryo about the fifth or sixth week, at which time it extends from the region of the heart to the pelvic region (Fig. 308). Each organ is attached to the dorsal body wall by a distinct mesentery which, at its cephalic end, also sends off a band to the diaphragm the diaphragmatic ligament of the mesonephros.
+The peritoneum is reflected over the surface of the mesonephros, and on the ventro-medial side the mesothelium becomes thickened to form the genital ridge (Figs. 276 and 308).
 {{Template:Bailey 1921 Figures}}
-[[Category:Human]]  [[Category:Coelom]] [[Category:Genital]] [[Category:Week 5]]
+[[Category:Human]]  [[Category:Renal]] [[Category:Genital]] [[Category:Week 5]] [[Category:Kollmann]]