4 6 



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 inframanclibular branch of the seventh nerve and below 

 with the suprasternal. 



Note the spinal accessory nerve pierces the tape/.ius muscle, and has many 

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



POSTERIOR 

 A URICULAR 



NER VE 



FACIAL NERVE 



AURICULAR Bit. OF 



GREAT AVRICULA.R 



1XFRA1IAXDIBULAS 



S UPBRFICIA L CER VIC A L 

 BRANCHES OF SUPER- 

 FICIAL CERVICAL 

 NERVE 



SUPRASTERNAL 



\ BRANCHES OF 



GREA T 

 ) A URICULAR 



CRF.AT OCCIPITAL 



LESSER OCCIPITAL 



<;RRAT AURICULAR 



MAXT01D BR. OK 2nd 



X.WALL OCCIPITAL 

 SPINAL ACCESS'tltY 



TWIGS FROM THE 

 .UASTOID ItRANCS 



BR. TO LEVATOR 



A\f;l'LI SCAPULA 

 SL'PRA-ACROMIAL 



SVPRACLA YICl'LAR 



-X TO 

 TRAJ'KXfrff 



SL-PRACLA V1CVLAR 



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



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 when 

 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 mcnto-sternal line. It opens into the subclavian rein or into the 

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



