/'//A III'. AD AND NECK. 



75 



transverse branch ; the great auricular, small occipital, and lesser or second 

 occipital are ascending. These branches had to undergo this very distribution . 

 to carry out the scheme of distribution of the cervical nerves a scheme we 

 everywhere invoke when we would account for sensory nerve distribution. 



The communicating brandies are : 



i. Extrinsic, as your dissection should show, with the auriculo-temporal, 

 the facial, the intercostals, the circumflex, and the great occipital. 



FIG. 41. SCHEME OF THE CERVICAL PLEXUS. 

 Note the loops by which one nerve communicates with the next. 



2. Intrinsic : with the hypoglossal, sympathetic, pneumogastric, spinal acces- 

 sory, and brachial plexus, for reasons set forth in a foregoing paragraph. 



External and Internal Series of Muscular Branches of the Cervical 

 Plexus. The scalenus medius, trapezius, levator anguli scapulas, and sterno- 

 cleido-mastoid are, according to the time-honored classification, given as the 

 external series, while all the remaining muscles would naturally fall to the internal 



