316 MUSCLES OF THE NECK. 



Inserted into the side of the tongue, near the stylo-glossus. 

 Use. To pull the tongue inwards and downwards. 



2. Lingualis, 



Arises from the root of the tongue laterally ; runs forwards 

 between the hyo-glossus and genio-glossus, to be 



Inserted into the tipv of the tongue, along with part of the 

 stylo-glossus. 



Use. To contract the substance of the tongue, and bring is 

 backwards, and to elevate the point of the tongue. 



Muscles situated between the Os Hyoides and Trunk, 



These may be divided into two layers. 

 The first layer consists of two muscles, 



1 . Sterno-Hyoideus, 



Arises, thin and fleshy, from the cartilaginous extremity of 

 the first rib, the upper and inner part of the sternum, and from 

 the clavicle where it joins with the sternum. 



Inserted into the base of the os hyoides. 



Use. To pull the os hyoides downwards. 



2. Omo-Hyoideus, 



Arises, broad, thin, and fleshy, from the superior costa of the 

 scapula, near the semilunar notch, and from the ligament that 

 runs across it ; thence ascending obliquely, it becomes tendinous 

 below the sterno-cleido-mastoid muscle ; and, gi'owing fleshy 

 again, is 



Inserted into the base of the os hyoides, betw^een its corn« 

 and the insertion of the sterno-hyoideus. 



Use. To pull the os hyoides obliquely downwards^ 



The second layer consists of three muscles. 



1 . Sterna- Thyroideus, 



Arises, fleshy, from the whole edge of the uppermost bone 

 of the sternum internally, opposite to the cartilage of the firsJ 

 rib, from which it receives a small part of its origin. 



