THE CERVICAL PLEXUS. 



285 



intertransverse muscles, the nerve divides into an ascending part, which joins the 

 first cervical nerve, and a descending part to the third. 



CERVICAL PLEXUS. 



The cervical plexus is formed by the anterior divisions of the upper four cervical 

 nerves, and distributes branches to some of the muscles of the neck, and 4 to a 



Fig. 191. THK SUPERFICIAL BRANCHES OF THE CERVICAL PLEXUS. 



andLeveille.) J 



(From Sappey, after Hirschfeld 



1, superficial cervical nerve (represented too large) ; 2, its inferior branch ; 3, its superior branoh ; 4, 

 its union with the facial ; 5, great auricular nerve ; 6, one of its facial branches ; 7, its branch to the 

 lobule ; 8, twig which pierces the auricle to pass to its outer surface ; 9, branch to the deep surface of 

 the pinna; 10, its union with the posterior auricular of the facial nerve ; 11, small occipital nerve ; 

 12, its branch which unites with the great occipital nerve ; 13, a mastoid branch arising separately from 

 the plexus ; 14, twigs from this to the back of the neck ; 15, inner, 16, 17. middle, 18, outer branches 

 of the supraclavicular nerves ; 19, branch of the cervical nerves passing into the trapezius muscle ; 20, 

 spinal accessory distributed to the same and receiving a uniting branch from the cervical nerves ; 21, 

 branch to the levator scapulae ; 22, trunk of the facial nerve ; 23, its posterior auricular branch passing 

 into the occipital and postei'ior and superior auricular muscles ; 24, its cervical branch ; 25, great 

 occipital nerve. 



portion of the integument of the head, neck, and chest. It is placed opposite 

 the first four vertebrae, beneath the sterno-mastoid muscle, and rests against 

 the middle scalenus muscle and the levator anguli scapulae. The disposition 



VOL. III. PT. 2. T 



