MYOLOGY 83 



Insertion. — To the crescent-shaped area at the back of the skull. 



Shape. — Short, thick, fleshy bundle. 



Relations. — Superiorly with the complexus; inferiorly with the 

 trachelo-mastoideus and the vertebrae. 



Action. — Singly, pulls the head to one side; acting with its fellow, 

 extends the head. 



- Biventer Cervicis (Fig. 19, No. 9). Location. — Occupies the su- 

 perior part of the neck. 



Origin. — From the side of the neural spine of the first dorsal 

 vertebra, and from the adjacent tendon of the longus colli posticus. 



Insertion. — To the occiput.- 



Shape. — Tendinous in the middle with a more or less spindle- 

 shaped belly at each end. 



Relations.- — Superior to the longus coUi posticus. It lies next to 

 the skin. 



Action.- — Extends the head on the neck and elevates the neck. 



Longus Colli Posticus (Fig. 19, No. 10). (Synonym. — Longus 

 colli dorsalis.) 



Location. — Occupies the superior part of the neck. 



Origin. — From the marginal edges of the summits of the neural 

 spines of the first two dorsal vertebrae. 



Insertion. — To the transverse process of the axis, and superior 

 part of the cervical vertebrae. 



Shape.- — -A long, somewhat narrow, flattened muscle, the inferior 

 portion of which is divided into five or six fasciculi. 



Relations.- — Superiorly with the biventer cervicis and inferiorly 

 with the vertebrae. 



Action. — Raises the neck upward. 



Obliquus Colli (Fig. 19, No. 11). Location. — On the lateral side 

 of the neck. 



Origin and Insertion. — The first of the seven fasciculi originates 

 from the diapophysis of the eleventh cervical vertebra, winds ob- 

 Uquely over the tenth, and is inserted into the posterior margin 

 of the postzygapophysis of the ninth vertebra. In its passage it 

 receives the slip from the longus colli posticus. The next fasciculus 

 originates from the transverse process of the tenth cervical vertebra, 

 winds obliquely over the ninth vertebra, and is inserted to the post- 

 zygapophysis of the eighth vertebra. ^ In its passage it also receives 

 a fasciculus from the longus colh posticus. The next three fas- 

 cicuU originate in a similar manner being attached to similar post- 



