Category:Carnegie Embryo 1008

From Embryology

This Embryology category includes pages and images that relate to the Carnegie Collection Embryo No. 1008.

References

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. 1008, 26 mm Crown-Rump Length

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. 1008 has 34 vertebrae, the last being larger than any of the others and divided incompletely into two segments, as diagrammatically shown in figure 19. The end of the chorda dorsalis presents a number of intricate coils and its caudal extremity lies against the thick wall of the spinal cord. The spinal cord narrows at the thirty-second vertebra, thus marking a boundary between the atrophic portion and the upper part of the cord. The walls of the atrophic portion show two folds - one on the ventral, the other on the dorsal wall. The former lies in the region of the thirty-fourth vertebra and is similar to those already seen. The one on the dorsal wall, at a level between the thirtysecond and thirty-third vertebrae, is a diverticulum which projects caudo-dorsally and contains a long, slender cavity continuous with the central canal. Such folds or diverticula are seldom seen on the dorsal wall of the caudal end of the spinal cord. In the other specimens studied folds were frequently encountered at this end of the cord, but always on the ventral wall. On the ventral wall of the upper, wider part of the canal, at a level between the twenty-ninth and thirtieth vertebrae, is another and much larger fold, extending down about the length of two vertebrae. Both of its margins fuse with the ventral wall, thereby forming a channel in the midline of the fold which unites with the central canal. In this specimen the spinal ganglia are 31 in number.



Cite this page: Hill, M.A. (2019, October 22) Embryology Carnegie Embryo 1008. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Category:Carnegie_Embryo_1008

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

Pages in category ‘Carnegie Embryo 1008’

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