142 The Alligator and Its Allies 



FIG. 32. CRURAL PLEXUS AND ISCHIADIC PLEXUS OF THE LEFT 

 SIDE OF A. MISSISSIPPIENSIS. THE NERVE BRANCHES ARE SHOWN AS 



FAR AS THEIR ENTRANCE INTO THE MUSCLES. THE CRURAL PLEXUS 



is MADE UP OF THE PRESACRAL STEMS a, b, c. THE OBTURATOR NERVE 

 is BUILT OF Two BRANCHES FROM STEMS A & B. (FROM BRONN, AFTER 

 GADOW.) 



a, b, c. presacral nerves, 

 a & /3. postsacral nerves. 

 s=XXVI. sacral nerve (26th 

 spinal nerve). 



2. to extensor ileo-tibialis muscle. 



3. to femoro-tibialis muscle. 



4. to ileo-fibularis muscle. 



5. to ileo-femoralis muscle. 



6. to caudi-ilco-fcmoralis mus- 



cle. 



7. caudi-femoralis muscle. 



8. to flexor tibialis externus 



muscle. 



9. to flexor tibialis internus 



muscle. 

 II. to ischio-femoralis muscle. 



13. pubo - ischio - femoralis in- 



ternus. 



14. pubo - ischio - femoralis ex- 



ternus muscle. 



15. to pubo-ischio-femoralis pos- 



terior muscle. 



