Category:Carnegie Embryo 485: Difference between revisions
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This specimen is cut in transverse section and is therefore well suited for the study of the spinal cord. There are 33 spinal ganglia, but at the thirty-third and thirty-second complete nerve-fibers can not be made out. The thirty-third, in particular, comprises such a small cell-group as to be hardly recognizable. There are 37 primitive vertebrae and a non-vertebrated tail portion 289 um long. As in the several specimens immediately preceding it, the few caudal vertebrae are fused together, showing no distinct boundaries. The non-vertebrated tail portion consists still of germinating mesenchymal cells, while the more cranially situated scleromeres are gradually becoming converted into precartilaginous tissue. | This specimen is cut in transverse section and is therefore well suited for the study of the spinal cord. There are 33 spinal ganglia, but at the thirty-third and thirty-second complete nerve-fibers can not be made out. The thirty-third, in particular, comprises such a small cell-group as to be hardly recognizable. There are 37 primitive vertebrae and a non-vertebrated tail portion 289 um long. As in the several specimens immediately preceding it, the few caudal vertebrae are fused together, showing no distinct boundaries. The non-vertebrated tail portion consists still of germinating mesenchymal cells, while the more cranially situated scleromeres are gradually becoming converted into precartilaginous tissue. | ||
[[Category:Carnegie Stage]] | |||
[[Category:Historic Embryology]][[Category:1910's]][[Category:Carnegie Collection]] | |||
Latest revision as of 16:17, 7 November 2017
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. 485, 13 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.
This specimen is cut in transverse section and is therefore well suited for the study of the spinal cord. There are 33 spinal ganglia, but at the thirty-third and thirty-second complete nerve-fibers can not be made out. The thirty-third, in particular, comprises such a small cell-group as to be hardly recognizable. There are 37 primitive vertebrae and a non-vertebrated tail portion 289 um long. As in the several specimens immediately preceding it, the few caudal vertebrae are fused together, showing no distinct boundaries. The non-vertebrated tail portion consists still of germinating mesenchymal cells, while the more cranially situated scleromeres are gradually becoming converted into precartilaginous tissue.
Pages in category 'Carnegie Embryo 485'
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