7 8 PRACTICAL ANATOMY. 



The branches you will find given off above the clavicle : 



1. Muscular branches to the subclavius, scaleni, longus colli, rhomboidei, 

 as indicated in figure 42. 



2. A communicating branch to the phrenic nerve. Follow the phrenic 

 nerve up, on the scalenus anticus muscle, and you will find a delicate nerve 

 coming through the muscle. 



3. The posterior thoracic nerve, also called the long thoracic, the external 



FACIAL NERVE 



AURICULAR BR. OF 



GREAT AURICULAR 



IfiFRAMANDIB ULAR 



SUPERFICIAL CERVICAL 

 BRANCHES OF SUPER- ( 

 FICIAL CERVICAL { 

 NERVE 



SUPRASTERNAL 



) BRANCHES OF 

 V GREA T 

 ) AURICULAR 



(IRE AT OCCIPITAL 



I.K.1SER OCCIPITAL 



HREAT AUSICCLAR 

 MASTOID BR. OR and 



SMALL OCCIPITAL 

 SPINAL ACCESSOR F 



TWIGS FROM THE 

 MASTOID BRAXCB 



BR. TO LKVATOR 



AffGULI SCAPULA 

 Sl'PRA- A CR OMIAL 



S CPRA CLA VICL' LA R 



BRANCHES TO 



TRAPEZim 



SL'PRAULA VICl'LAX 



FIG. 43. SUPERFICIAL BRANCHES OF THE CERVICAL PLEXUS. (After Hirschfeld and Leveille.) 



phrenic, and external respiratory nerve of Bell, supplies the serratus magnus 

 muscle. You will find this nerve in the axillary space. 



4. The suprascapular nerve (Fig. 42) arises from the upper trunk. It passes 

 through the suprascapular foramen, in the superior costa of the scapula and 

 supplies the supra- and infraspinati muscles. 



Branches from t/ic UnicJiial Plexus /'refer. Outer cord: External anterior 

 thoracic nerve to pectoralis major ; outer head of the median nerve fuses with 

 inner head from the inner cord of the plexus ; musculo-cutaneous nerve to 

 flexors of the forearm and coraco-brachialis. 



Inner cord : Internal anterior thoracic to pectoralis minor ; inner head of the 



