BRANCHES FROM THE CERVICAL PLEXUS. 



581 



the plexus communicates with the pneumo-gastric, spinal accessory, 

 hypoglossal, and sympathetic nerves. 



Fis. 356. 



Fig. 356. — Dekp Dissection of the Axilla, showing the Brachial Plexus akd 

 NEIGHBOURING Nerves (from Sappej after Hirsclifeld and Leveill^). \ 



Tbe clavicle has been sa.vra tlirougli near its sternal end, and is turned aside with the 

 muscles attached to it ; the subclavius and the greater and lesser pectoral muscles have 

 been removed from the front of the axilla. 1, loop of union between the descendens noni 

 and a branch of the cervical plexus ; 2, pneumo-gastric ; 3, phrenic passing down to the 

 inner side of the scalenus anticus muscle ; 4, antei-ior primary division of the fifth cervical 

 nerve ; 5, the same of the sixth ; 6, 7, the same of the seventh and eighth cervical 

 nerves ; 8, the same of the first dorsal nerve ; 9, 9, bi'anch from the plexus to the sub- 

 clavius muscle, communicating with the jihrenic nerve ; 10, posterior thoracic nerve dis- 

 tributed to the serratus maguus •,11. upjier anterior thoracic nerve passing into the great 

 pectoral muscle ; 13, lower anterior thoracic distributed to the lesser pectoral ; H, twig 

 of communication between these two nerves ; 12, suprascapular nerve passing through the 

 suprascajjular notch ; 15, lower of the two subscapular nerves ; 16, nerve of the teres 

 major ; 17, long subscapular, or nerve of the latissimus dorsi ; 18, accessory of 

 the internal cutaneous nerve ; 19, union of the accessory cutaneous with the second 

 and third intercostal nerves ; 20, lateral branch of the second intercostal ; 21, second 

 internal cutaneous or nerve of Wrisberg ; 22, internal cutaneous nerve ; 23, the ulnar 

 nerve to the inside of the axillary ai'tery, passing behind the vein, and having, in 

 this case, a union with the upper division of the plexus ; 24, the median nerve im- 

 mediately below the place where its two roots embrace the artery, which is divided above 

 this place ; 25, the musculo-cutaneous nerve passing into the coraco-brachialis muscle ; 

 26, the musculo-spiral nerve passing behind -the divided brachial artery. 



