ANATOMY IN A NUTSHELL. 



521 



one-third of the lower border of the zygomatic arch and all of its inner surface. 



Insertion. — The insertion of the superficial portion is into the angle and 

 Lower half of the outer surface of ramus of the jaw. The insertion of the deep 

 portion is in the upper half of the ramus and outer surface of the coronoid pro- 

 cess of the lower jaw. 



Action. — It is a muscle of mastication. It raises the back part of the 

 lower jaw. 



Nerve Supply. — Masseteric branch of inferior maxillary division of the 

 fifth nerve. 



Blood Supply. — Facial artery, transverse facial artery, and the masseteric 

 branch of the inferior maxillary artery. 



PLATECCLXXI. 



CAVITY OF 

 CERVIX WITH 

 AReOR VITA 



EXTERNAL CS 



The Uterus, Horizontal Section. 



3. Occipito-frontalis muscle, which has been described on page ">13. 



4. Sterno-cleido-mastoid, which has been described on page 40. 



5. Splenitis capitis, which has been described on page 272. 



6. Traehelo-masfoid, which lias been described on page '-'7 1. 



7. Digastric— Description. This muscle, which pierces the Stylo-hyoid 

 muscle near its insertion on the hyoid hone, consists of two fleshy bellies and ;i 

 rounded tendon between them. From this tendon of the Digastric a broad 

 aponeurosis is given off which is attached to the body and greater cornu of the 

 hyoid bone. This aponeurosis is called the supra-hyoid aponeurosis. 



