46 PRACTICAL ANATOMY. 



The descending branches of the cervical plexus are (i) the suprasternal, 

 (2) the supraclavicular, (3) the supraacromial. Trace these out, as in figure 22. 



Note that the superficial cervical branch passes behind the external jugular 

 vein ; that it is distributed to almost the entire front of the neck ; that it anasto- 

 moses above with the inframandibular branch of the seventh nerve and below 

 with the suprasternal. 



Note the spinal accessory nerve pierces the tapezius muscle, and has many 

 communications with the other nerves in the occipital triangle. To this fact is 



POSTERIOR 

 A URICULAR 



NERVE 



FACIAL NERVE 



AURICULAR BR. OF 



ORE A T A URICULAR 



INFRAHANVIBULAR 



SUPERFICIAL CERVICAL 

 BRANCHES OF SUPER- 

 FICIAL CERVICAL 

 NER VE 



SUPRASTERNAL 



) BRANCHES OF 

 }- GREA T 

 \ AURICULAR 



C RE AT OCCIPITAL 



LESSER OCCIPITAL 



GREAT AURICULAR 

 MASTOID BR. OH 2nd 



SMALL OCCIPITAL 

 SPI.VAL ACCESSORY 



TWIGS FROM THE 

 .VASTOID BRANCU 



BR. TO LKVATOR 



A\<;ri.i si-AWLji 



SI' PR A- A CROMIAL 

 Sl'PRACLAVICCLAR 



BRANCHES TO 



TR APEX I US 



si 8OPBACU.rtC1tLAM 



FIG. 22. SUPERFICIAL BRANCHES OF THE CERVICAL PLEXUS. (After Hirschfeld and Leveille.) 



possibly due the twitching of the shoulder in frostbitten ears ; purely a reflex 

 movement. (Fig. 22.) 



The Superficial Lymphatic T. This will enable you to remember the 

 general distribution of the superficial lymphatic glands in the neck. (Fig. 23.) 

 In the main the lymphatics follow the veins. They are readily seen win 11 

 enlarged by disease ; they are scarcely recognizable in cadavers when not diseased. 



The jugular veins (Fig. 18) in the superficial fascia are : (i) The anterior, 

 near the mid inento-sternal line. It opens into the *iibela:>ian rein or into the 

 external jugular under the stcrno-cleido-mastoid muscle. (2) The posterior jugular 



