302 



STUDY OF PIG EMBRYOS. 



Mes. 



FIG. 207. PIG, 12.0 MM. FRONTAL SERIES 6, SECTION 572. 



Inlersegmental artery. A.L, Anterior limb, tin, Cinerea of spinal cord. EC, Ectoderm. G, Ganglion. 

 Iv.D, Intervertebral disc. Mes, Mesoderm. N',N", Nerves. N.br, Nerve-branch of brachial plexus. 

 Sp.cf, Cephalad portion of spinal cord. -Sp.c". Caudad portion of spinal cord. V.arch, Anlage of arch of 

 vertebra. X 22 diams. 



