THE SKELETON 



413 







-~' f \ 

 ,;*j 



;vj 



FIG. 232. Frontal section through the base of the tail of a chick 

 embryo of 96 hours. The anterior end of the section (above 

 in the figure) is at a higher plane than the posterior end. 



caud. Scl., Caudal division of the sclerotome. ceph. Scl., Ce- 

 phalic division of the sclerotome. Derm., Dermatome. Ep., Epi- 

 dermis. Gn., Ganglion, int's. F., Intersomitic fissure, int'v. F., 

 Intervertebral fissure. My., Myotome. N'ch., Notochord. N. T., 

 Neural tube, per'ch. Sh., Perichordal sheath, s. A., Segmental 

 artery. 



