Sp. c." 



FIG. 128. PIG, 12.0 MM. FRONTAL SERIES 6, SECTION 572. 



A.i.s, Intersegmental artery. A.L, Anterior limb, cin, Cinerea of spinal cord. EC, Ectoderm. G, Ganglion. 

 mes, Mesoderm. N 1 ' ,N f> ', Nerves. JV.br, Nerve-branch of brachial plexus. Sp.c' ', Cephalad portion of 

 spinal cord. Sp.c" , Caudad portion of spinal cord. V.arch, Anlage of arch of vertebra. Vert, Anlage 

 of the body of a vertebra. X 22 diams. 



216 



