Muscles of the Neck. 



153 



207. The Subcutaneous Muscle of the Neck. 



Muscles of the Neck, which move the Head and Lower Jaw: 



Platysma myoides (M. subcutaneus colll). Orig. : Subcutaneous connective 

 tissue of the chest and Fascia pector alls in the region of the second rib. Insert, 

 of the inner bundles which cross each other: At the lower margin of the inferior 

 maxillary bone; of the others: Into the Panniculus adiposus of the face and into 

 the Fascia parotideo-masseterica. (Depresses the lower jaw, and raises the skin.) 



M. sterno - cleido - mastoideus (Fig. 208). Orig. by two heads: From the 

 Manubrium sterni and the sternal extremity of the clavicle. Insert. : Into the mastoid 

 process and into the superior curved line of the occipital bone. (Each acting singly 

 rotates and flexes the head; both acting together and taking their fixed point 

 at the head, elevate the thorax; they also bend forwards the head and neck 

 towards the sternum.) 



M. biventer seu digastricus maxillae inferioris (Fig. 208). Orig. of the 

 posterior belly : From the digastric groove at the mastoid process of the temporal 

 bone; of the anterior belly: from the lower border of the lower jaw, the inter- 

 vening tendon being attached to the hyoid bone. (Depressor of the lower jaw.) 

 Heitzmann, Atlas. I. 20 



