78 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 



POSTERIOR 

 A URICULAR 



NER VE 



FACIAL NERVE 



AURICULAR BR. OF 



GREAT AURICULAR 



INFRAMAXDIBVLAR 



SUPERFICIAL CERVICAL 

 U RANCHES OF SUPER- 

 FICIAL CERVICAL 

 NERVE 



SUPRASTERNAL 



) BRANCHES OF 



OREAT 

 AURICl'LAR 



RBAT OCCIPITAL 



I.KSSKK OCCIPITAL 



flREAT AURICl'LAR 

 MASTOID BR. OK Hid 



KM ALL OCCIPITAL 

 SPINAL ACCESSOR T 



TWIGS FROM THR 

 MASTOID BRANCH 



BR. TO LEVATOR 



AXOULI SCAPVI..S 

 SL'PRA-ACROMIAL 



SUPRACLA rfCL'LAR 



BRAXCHES TO 



TRAPEZIl'S 



STPRACLA VICULAS 



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 the Brachial Plexus Proper. 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 



