626 STXOrSIS OF NEEVE DISTKIBUTIOlSr. 



the musculo-spiral nerve. The muscles in front of the forearm are 

 supplied by the median nerve, with the exception of the flexor carpi 

 ulnaris and the ulnar half of the flexor profundus digitorum, which are 

 supplied by the ulnar nerve, and the supinator longus, which is supplied 

 by the musculo-spiral. 



3Iuscles of the hand. — The abductor and opponens pollicis, the outer 

 half of the flexor brevis pollicis, and the two outer lumbricales muscles, 

 are supplied by the median nerve : all the other muscles receive their 

 nerves from the ulnar. 



5. To muscles of the lower limb. — Posterior muscles of the hip and 



thigh. — The gluteus maximus is mainly supplied by the small sciatic 

 nerve, and receives at its upper part a separate branch from the sacral 

 plexus. The gluteus medius and minimus, together with the tensor 

 vaginae femoris, are supplied by the gluteal nerve. The pyriformis, 

 gemelli, obturator internus, and quadratus femoris receive special 

 branches from the sacral plexus. The hamstring muscles are supplied 

 by branches from the great sciatic nerve. 



Anterior and internal muscles of the thigh. — The psoas muscle is sup- 

 plied by separate twigs from the lumbar nerves. The iliacus, quadriceps 

 extensor femoris, and sartorius are supplied by the anterior crural nerve. 

 The adductor muscles, the obturator externus and the pectineus, are 

 supplied by the obturator nerve, but the adductor magnus likewise 

 receives a branch from the great sciatic, and the pectineus sometimes 

 has a branch from the anterior crural. 



Anterior muscles of the leg and foot. — The muscles in fi'ont of the leg, 

 together with the extensor brevis digitorum, are supplied by the anterior 

 tibial nerve. 



The peroneus longus and brevis are Eupplied by the musculo-cutaneous 

 nerve. 



Posterior muscles of the leg. — The gastrocnemius, plantaris, soleus, 

 and popliteus are supplied by branches from the internal popliteal 

 nerve ; the deep muscles, viz., the flexor longus digitorum, flexor longus 

 pollicis, and tibialis posticus, derive their nerves from the posterior 

 tibial. 



Plantar muscles. — The flexor brevis digitorum, the abductor and 

 flexor brevis pollicis, and the two inner lumbricales, are supplied by the 

 internal plantar nerve ; all the others, including the flexor accessorius 

 and interossei, are supplied by the external plantar nerve. 



III. SYMPATHETIC NERVES. 



The nerves of the sympathetic system are distributed in general to all 

 the internal viscera, and to the coats of the blood-vessels. Some organs, 

 however, receive their nerves also from the cerebro-spinal system, as the 

 lungs, the heart, and the upper and lower parts of the alimentary 

 ■canal. 



This division of the nervous system consists of a somewhat compli- 

 cated collection of ganglia, cords and plexuses, the parts of which may, 

 for convenience, be classified in three groups, viz., the principal gang- 

 liated cords, the great prevertebral plexuses with the nerves proceeding 

 from them, and the ganglia of union with cranial nerves. 



The great gaugliated cords consist of two series, in each of ^vhich 



