142 The Alligator and Its Allies 



muUJE. 



XXVI 



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, h, c. presacral nerves. 8. 



a & ;3. postsacral nerves. 

 s=XXVI. sacral nerve (26th 9. 

 spinal nerve). 



2. to extensor ilco-tibialis muscle. 1 1 . 



3. to femoro-tibialis muscle. 13. 



4. to ileo-fibularis muscle. 



5. to ileo-femoralis muscle. 14. 



6. to caudi-ilco-fcmoralis mus- 



cle. 15. 



7. caudi-fcmoralis muscle. 



to flexor tibialis extemus 

 muscle. 



to flexor tibialis internus 

 muscle. 



to ischio-femoralis muscle. 



pubo - ischio - femoralis in- 

 ternus. 



pubo - ischio - femoralis ex- 

 tcrnus muscle. 



to pubo-ischio-femoralis pos- 

 terior muscle. 



