THE SKELETOX 



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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., Mvotome. N'ch., Notochord Nt' 

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

 artery. 



