DISSECTING MANUAL. 



protuberance, and supplying the skin of the scalp as far as the 

 vertex. It supplies the Complexus, Inferior oblique, Semi- 

 spinalis colli, and Multifidus spinae ; and communicates, on the 

 scalp, with the great and the posterior auricular, and the small 

 and the least occipital. [612] 



The posterior cervical plexus consists of communicating loops 

 between the suboccipital and branches of the second, third, 

 and (occasionally) fourth nerves. Branches of these loops 

 supply the surrounding muscles. [612] 



Third Cervical. The posterior primary division is smaller 

 and communicates early with the second and, sometimes, the 

 fourth cervical. It then divides into two branches: the ex- 

 ternal muscular branch supplies the contiguous muscles; the 

 internal cutaneous branch runs backward and inward, be- 

 comes superficial near the midline as the third or least occip- 

 ital nerve, and supplies the neck and scalp, communicating 

 with the great occipital. [612] 



Fourth, Fifth, and Sixth Cervical. The posterior primary 

 divisions are still smaller. They divide under the Complexus 

 into external muscular branches to neighboring muscles, and 

 internal cutaneous branches to the back of the neck near the 

 midline. [613] 



Seventh and Eighth Cervical. Theposter ior primary divis- 

 ions are the smallest and usually have only muscular branches, 

 to the deep muscles of the neck. [613] 



VESSELS. 



The arteries are twigs of the vertebral, which enters the 

 suboccipital triangle, and the other arteries of the front of the 

 neck. 



The veins are the venae comites of the arteries. 



[106] 



