190 



THE NERVOUS SYSTEM. 



(d] The Ramm dorsalis is a very small nerve ; according to 

 Waldeyer it possesses only twenty nerve-fibres. It arises from 



Fig. 127. 



S7 



Ki 



The sciatic plexus, fruui 

 a Communicating nerve from the ninth spinal 



nerve. 



a' Nerve to muse. lev. ani. 

 6 Nerve to oviduct. 

 c Urostyle. 

 cc Communicating twig from the ninth spinal 



nerve. 



ci M. coccygeoiliacus. 

 c.I M. coccygeosacralis. 

 d Nerve to bladder. 

 d' Twig to the m. iliacus. 



e Twig from sciatic plexus to coccygeal plexus, 

 t M. intertransversarius. 

 i M. ilio-coccygeus. 

 ip M. ilio-psoas. i 



lev M. lev. ani. 



oi M. obliq. abdom. internus. 

 f Transverse process of sacrum. 



a drawing by Wiederaheim. 



Ao Aorta. 



Com Point of union of nerves a and cc. 



Is Ischium. 

 x MS Fifth spinal nerve. 

 " M6 Sixth spinal nerve. 

 x Mj Seventh spinal nerve. 

 - 3/8 Eighth spinal nerve. 

 Mg Ninth spinal nerve. 

 *> Mio Tenth spinal nerve. 



M-ja M. ilioliy)Migastricu3. 



3/76 M. cruralK 



Ni Sciatic nerve. 



Ovd Oviduct. 



Reef Rectum. 



S-j, SS, Sg, Sio Kami communicantes of seventh, 

 eighth, ninth, and tenth spinal nerves. 



Vex Bladder. 



8, 9 Eighth and ninth vertebrae. 



