STUDY OF SECTIONS OF EMBRYO OF 20 MM. 



Cin. D.R. epen. arach. Sk. EC. 



319 



V .arc. 



A.sul. 



Vert. _ 



Nch. 



muse. 



Sym. 



V.il. 



cart". 



V.p. 



Pen. 



FIG. 216. PIG, 20 MM. TRANSVERSE SERIES 59, SECTION 1253. 



arach, Arachnoid membrane. A.sul, Arteria sulci. cart', cart", Cartilaginous anlages of elements of the skeleton 

 of the limb. Cin, Neurone layer of spinal cord. D.R, Dorsal root. EC, Ectoderm, epen, Ependymal layer 

 of spinal cord. G, Spinal ganglion, muse, One of the muscular anlages. N, N, N, Nerves of the lumbar 

 plexus. Nch, Notochord. Pen, Penis. Red, Rectum. Sk, Anlage of the dura mater. Sym, Sympathetic 

 nerve. T, Tail. Ur, Urethra. V.drc, Vertebral arch. Vert, Vertebra. V.il, Iliac vein. V.p, Border 

 vein of the limb. X 22 diams. 



