7 6 



PRACTICAL ANATOMY. 



series. It may be said, with all deference, that this classification is categorical only. 

 It rests on no basis of physiology, philosophy, rationalism, or even sense ; it is 

 categorical only. It belongs to that part of our nomenclature that had its origin 

 in fanciful creations, and in location only, like sphenoid, ethmoid, and external 

 iliac. It is tolerated in anatomy and revered on account of its antiquity. 



The branches of the cervical plexus, tabulated according to the prevailing 

 custom, but carried out to their distribution to show that these nerves are 

 physiologically associated, directly or indirectly, with respiration : 



J.Thne, Sub -scapular Mrues, 

 2Jniern 



fflnar 

 Jntern-al -cutaneous 

 Lesser IntefTull cutaneous 



flam litters 



tnatomy 



FIG. 42. SCHEME OF THE BKACHIAL PLEXUS. 

 Note the acute angles characterizing the union of nerves. 



SUPERFICIAL BRANCHES. (Fio. 43.) 



ASCENDING. (i) Second occipital supplies the skin over the mastoid insertion of 

 the sterno-cleido-mastoid. (2) Lesser occipital supplies the skin of the scalp 

 over the occipital origin of the trapezius, and over the greater insertion of 

 the sterno-mastoid. (3) Great auricular supplies the skin over the facial 

 part of the platysma and parotid gland, and over the insertions of the 

 three dermal muscles inserted into the external ear. (4) Superficial cenncal 

 supplies the skin over the origin of the muscles arising from the genial 

 tubercles, and over the muscles inserted into the hyoid bone. 



