356 NEUROLOGY, OR ANATOMY OF NERVOUS SYSTEM 



facial branches to the skin over the parotid, a mastoid branch 

 to the skin in that region, and auricular branches to the lobule 

 and back of the auricle. By these branches the nerve also 

 communicates with the facial and small occipital. 



(c) The occipitalis minor, from the second and third (some- 

 times only the second), runs along the posterior border of the 

 sternomastoid to the head and supplies the scalp. It com- 

 municates with the great occipital and the great and posterior 

 auricular nerves, and gives a branch to the auricle. 



FIG. 63 



Neuraxis of Peripheral 

 Sensory Neurone 



Nerve Trunk 



Spinal Ganglioti 



Dendrite of 



Peripheral Sensory 



Neurone 



Anterior Horn of Gray Matter 

 of Spinal Cord 



Neuraxis of Peripheral Motor Neurone 



f Sympathetic Ganglion 



Neuraxt* of 



Sympathetic Neurone 



Diagram to show the composition of a peripheral nerve trunk. 

 (Bohm and Davidoff.) 



2. DESCENDING BRANCHES. These are the supraclavicular 

 nerves. They arise from the third and fourth cervical, and 

 divide into the suprastcrnal, supraclavicidar, and xupraacromial 

 branches, which descend between the trapezius and sterno- 

 mastoid to supply the skin over the regions indicated by their 

 names. 



The deep branches .consist of an e.rfernal and an internal 

 series. 



The EXTERNAL include muscular, to the sternomastoid 

 (from the second); trapezius, scalenus medius, and levator 

 anguli scapulse (from the third and fourth), and communicating, 



