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. £c, Ectoderm. G, Ganglion. 

 mis, Mesoderm. N',N" , Nerves. N.br, Nerve-branch of brachial plexus. Sp.c' , Cephalad portion of 

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

 of the body of a vertebra. X 22 diams. 



216 



