SrowEi.i., JVerves 'm the Domestic Cat. 311 



TV. Crur<€us Anterior. — Origin: Seventh lumbar. Dis- 

 tribution: MM. psoas, iliacus, sartorius, vastus externus, 

 V. internus, rectus femoris, crurjeus, pectineus, and gives 

 origin to 



N. Cutaneus Internus Longus. — Distribution: To in- 

 tegument of cephalic crus, dorsum of foot and plantar 

 plexus. 



N'. Obturator. — Origin: Loop between seventh lumbar 

 and first sacral nerves, lumbosacral cord (anthropotomy). 

 Distribution: MM. pectineus, obturator, adductor magnus 

 and longus, gracilis. 



SACRAL NERVES. 



Characters in common: Paired, three pairs; dorsal and 

 ventral divisions; related w^ith sympathic system; muscular 

 and cutaneous; unequal size; formation of sacral plexus, 

 which is the origin of several nerves. 



Special Characters : First sacral nerve., largest of spinal 

 nerves; joined with the lumbar cord in the lumbo-sacral cord. 



N. Gemellus. — Origin: Ramus of first sacral at foramen 

 of exit. Distribution: M. gemellus superior. 



Second Sacral Nerve. — Much smaller than the first nerve; 

 union with first nerve forms N. ischiadicus; joins the third 

 nerve in the anastomotic loop. 



Third Sacral Nerve. — Smallest sacral nerve; joins sacral 

 and coccygeal plexuses; innerves the M. levator ani; the 

 urocyst; by its rami becomes the sacral root of NN. coccy- 

 geus, gluteus, pudicus, and a nerve not homologized. 



N. Gluteus Superior. — Origin: Sacral plexus at first 

 sacral nerve. Distribution: Cephalic branch to M. gluteus 

 medius, caudal branch to M. gluteus minimus, middle branch 

 to M. tensor vaginte femoris. 



N. Ischiadicus. — Origin: Union of first and second sacral 

 nerves. Distribution: MM. quadratus femoris, glutei, pyri- 

 formis, biceps, semi-tendinosus, semi-membranosus, obtura- 

 tor internus, ribband muscle.^. 



