THE NERVOUS SYSTEM 22$ 



The anterior tibial supplies the tibial artery and the several 

 muscles of the anterior part of the leg, and furnishes 

 branches to the foot and the articulation of the tarsus and 

 metatarsus. The musculocutaneous nerve passes down 

 along the fibula, supplying the peroneal and extensor 

 muscles of the foot; the internal branch supplies the ad- 

 jacent parts of the foot and toes; the external supplies the 

 toes and communicates with the external saphenous nerve. 



THE GREAT SYMPATHETIC NERVE 



This nerve is divided into two portions: the vertebral 

 and the pre vertebral. 



The vertebral portion is divided into ganglia, 

 which unite and form a cord running longitudinally; it 

 passes alongside the vertebral column from the head to 

 the coccyx, communicates with the spinal and cranial 

 nerves, and distributes branches to the internal organs 

 and viscera. 



The prevertebral portion also comprises a number 

 of ganglia that form plexuses in the head, chest, abdomen, 

 and pelvis. 



The sympathetic nerve, as has been previously stated, 

 communicates with the cerebrospinal nerves immediately 

 at their exit from the cranium and vertebral canal . (See 

 Fig. 114.) 



The branches accompany the arteries that supply the 

 several organs, and form plexuses that surround the 

 blood-vessels; they take the name of the artery they 

 accompany. All the parts of the head, neck, and trunk 

 are supplied, some of them exclusively, by branches from 

 the sympathetic; therefore it has been called the nerve of 

 "organic life." Since it contains so great a number of 

 ganglia, which is evinced from the disposition it has to 

 communicate with others in its distribution, it has also 



