Category:Carnegie Embryo 382
Kunitomo K. The development and reduction of the tail and of the caudal end of the spinal cord (1920) Contrib. Embryol., Carnegie Inst. Wash. Publ. 272, 9: 163-198.
Embryo No. 382, 23 mm Crown-Rump Length
Embryo No. 382 has 34 cartilaginous vertebrae. The last three do not lie exactly in a row in the median line, as can be seen in figures 15 and 41. The ventral portions of the thirty-second and thirty-fourth vertebrae, and the dorsal portion of the thirty-third, have become converted into cartilage, whereas the remainder of these two vertebrae still consists of precartilage tissue, as in younger specimens. .\t the thirty-third vertebra the chorda dorsalis gives ofT a short branch in a dorsal direction. Caudal to this the chorda winds and finally disappears in the caudo-dorsal portion of the thirty-fourth vertebra. Opposite the end of the chorda the wall of the spinal cord is so thickened as to gi\e the iini)ression that the two might have l>een attached. It is to be regretted that in most of the specimens the caudal end of the chorda dorsalis is torn. At the caudal end of the last vertebra the middle sacral artery anastomoses with the anterior spinal artery through a branch, similar to that mentioned in the last specimen. At the caudal end of the embryo there is a bud-like structure of the skin. This proves to be a stunted tail, for at it.s root can be recognized the sharp caudal end of the spinal cord and the terminal branches of the middle sacral artery and vein. The central canal of the spinal cord narrows at the thirty-second vertebra, but the ventral wall of its atr()i)hic portion does not exhibit the folding that usually occurs in this region.
Cite this page: Hill, M.A. (2020, May 31) Embryology Carnegie Embryo 382. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Category:Carnegie_Embryo_382
- © Dr Mark Hill 2020, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
Pages in category ‘Carnegie Embryo 382’
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