NECK. 7 J 



lar tissue below the clavicle. Insertion, into the muscles upon the 

 side of the face and lower jaw. The; draws the skin of the neck 

 and lower jaw downwards. 



Stenio-cleido-mastoideus,^'^ forms the most prominent feature on the 

 outside of the neck. Origin, from the upper part of the 'sternum, 

 and sternal end of the clavicle. Insertimi, into the mastoid process 

 of the temporal and into the superior semicircular ridge of the oc- 

 cipital bone. Use; acting with its fellow, draws the chin towards the 

 breast. 



Sterno-hyoideus}^ — Origin, from the sternum, clavicle, and car- 

 tilage of the first rib. Insertion, into the inferior edge of the os 

 hyoides. Use; draws the hyoid bone towards the sternum. 



SternO'thyroideus}^ — Origin, from the sternum and cartilage of 

 the first rib. Insertion, into the side of the thyroid cartilage. JJse; 

 draws the cartilage downwards. 



ThyreO'hyoideus}^ — Origin, from the side of the thyroid carti- 

 lage. Insertion, into the body and cornua of the os hyoides. TJse ; 

 it approximates the hyoid bone and thyroid cartilage. 



Omo-hyoideiis.^'^ ^^ — Origin, from the superior edge of the sca- 

 pula, near the coracoid notch. Insertion, into the base of the hyoid 

 bone. Use; draws the hyoid bone downwards. It is tendinous in 

 its middle. 



Digastricus.^^ — Origin, from the fossa, behind the mastoid pro- 

 cess of the temporal bone. Insertion, into the base of the lower 

 jaw, at the side of its symphysis ; its middle is tendinous, and per- 

 forates the stylo-hyoid muscle near its insertion. Use; elevates the 

 hyoid bone, and opens the mouth, even when the lower jaw is fixed. 



Stylo-hyoideus? * — Origi?t, from the middle and inferior part of 

 the styloid processes of the temporal bone. Insertion, being per- 

 forated : into the junction of the body and cornua of the hyoid bone. 

 Use; draws the hyoid bone upwards and backwards. 



Stylo- glossus.^ — Origin, from the upper and internal part of the 

 styloid process. Insertion, into the side of the root of the tongue. 

 Use; draws the tongue backwards. 



Stylo-pharyngeus^^ — Origin, from the inner side of the styloid 

 process near its root. Insertion, into the side of the pharynx, be- 

 tween the superior and middle constrictor muscles. Use; raises and 

 widens the pharynx. • 



Mylo-hyoideus,^ forms the floor of the mouth. Origin, from the 

 mylo-hyoidean ridge of the inside of the lower jaw. Insertion, into 

 a white tendinous line, between it and its fellow, and hyoid bone. 

 Use; draws the hyoid bone upwards, and projects the tongue. 



Genio-hyoideus.^ — Origin, from the posterior tubercle, inside of 

 the chin. Insertion, into the body of the hyoid bone. Use; draws 

 it upwards and forwards. 



Longus colli? ^^ — Origin, from the bodies of the three superior 



