NERVES. 35 



NERVES. 



BEEVES : 31 pairs, viz.: 8 cervical, 12 dorsal, 5 

 lumbar, 5 sacral, i coccygeal. Each have an anterior and 

 posterior root, hence have moto-sensor functions. 



'Cervlca'les I (see pages 15 and 16). Dorsa'les : ist from be- 

 tween ist and 2d dorsal vertebrae, the last from between i2th 

 dorsal and ist lumbar. The POSTERIOR branches have external 

 and internal branches. The cutaneous branches are the 6 

 upper from the internal branches, the 6 lower from the exter- 

 nal branches. These nerves supply the structures of the 

 back. ANTERIOR branches supply walls of the chest and 

 abdomen, each having branches from the sympathetic. Su- 

 ferio'res Intercosta'les ) pass forwards with the arteries, giving 

 off numerous branches, the chief being the lateral cutaneous, 

 which have anterior and posterior branches. The ist inter- 

 costal has no lateral branches; the 2d has a large one (the 

 intercos'to-humera'lis,) which supplies the integument of up- 

 per inner half of arm. Intercosta'les inferio'res, have nearly 

 the same course as the superior, supplying the anterior cuta- 

 neous nerves to abdomen, and having lateral branches. 



LumTjaleS : have largest roots of all ; have anterior and 

 Posterior branches ; the latter having external and internal 

 branches ; the anterior branches uniting to form the lumbar 

 plexus. Supply muscles and integument in their region. The 

 anterior branches communicate with sympathetic. Sacra'103 

 and Coccygea'les : (see nerves of lower extremity.) 



EXTREMITY. 



MUSCLES. 



(l) ILIAC REGION 3. 



Pso'aS ttag'nSS last dorsal and all lumbar vertebrae (trans- 

 verse processes) lesser trochanter, in union with iliacus. [An- 

 terior branches lumbar.] 



Pso'aS par'vug : sides of bodies last dorsal and ist lumbar 

 vertebrae ilio-pectineal eminence. [Anterior branches lum- 

 bar.] 



Ili'aCUSI iliac fossa, crest and anterior spinous processes of 

 ilium, base sacrum outer side tendon psoas magnus. [Ante- 

 rior crural.] 



(2) ANTERIOR FEMORAL REGION 7. 



Ten'SOr 7agi'n fem'oriS : outer crest ilium, anterior superior 

 Spinous process fascia lata, % way (laterally) down the thigh. 

 [Superior gluteal.J 



