Fig. 81. DISSECTION OF THE SPINAL CORD. [Photograph of the first prize dis- 

 section at the University Medical College, 1895, by J. J. Moorhead.] a, Dura of cord 

 reflected, b, Arachnoid and pia of cord still enveloping it. The former membrane 

 is very thin and cannot be demonstrated in such a dissection. The pia and its vascu- 

 lar construction is apparent, c, One of the spinal nerve roots. Many of the others 

 are shown, d, The cauda equina. e, The great sciatic nerve. 



