D.A\ 



arach. 



V.arc 



A.sul. 



Vert 



Red. 



cart. 



G. 



Nch. 



N. 



cart/ 



N. 



N. 



Sym. 



VM. 



Pen. 



Fig. 143. — 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. 

 Nerves of the lumbar plexus. Nch, Notochord. Pen, Penis, 

 mater. Sym, Sympathetic nerve. T, Tail. Ur, Urethra. 

 V.il, Iliac vein. F./, Border vein of the limb. X 22 diams. 



248 



One of the muscular anlages. N, N, N, 

 Rect, Rectum. Sk, Anlage of the dura 

 V.arc, Vertebral arch. Veii, Vertebra. 



