INFERIOR CERVICAL GROUA 179 



Sterno-maxillaris, 

 Stemo-thyro-hyoideus. 

 Subscapulo-h yoideus. 

 Rectus capitus anticus major. 



Rectus capitis anticus minor. 

 Rectus capitus lateralis. 

 Scalenus. 

 Longus colli. 



STERNO-MAXILLARIS. 

 (Pl. IL 20.) 



Placed along the lower border of the levator humeri, this muscle 

 is long, narrow, and flat, its fibres extending forwards and 

 upwards ; it is fleshy, terminating in a flat tendon. 



Origin. — From the anterior portion of the cariniform cartilage: 

 it is united to its fellow along its inferior third. 



Insertion. — To the angle of the lower jaw. 



Relation. — Externally with the panniculus and the parotid 

 gland ; internally with the sterno-thyro-hyoideus and subscapulo- 

 hyoideus, the trachea and carotid artery ; the jugular vein runs 

 along its superior border. 



Action. — Acting with its fellow, it flexes the head downwards, 

 or singly, it turns the head to one side. 



STERNO-THYRO-HYOIDEUS. 



(Sterno-thyroideus and Sterno-hyoideus.) 



(Pl. IIL 3.) 



This is a slender muscle situated in front of the trachea ; it is 

 narrow, ribbon-shaped, and divided into two parts. Fleshy at its 

 origin, it divides half way up the neck into two portions, each 

 having a tendon of insertion. About their middle the sterno- 

 thyro-hyodei have tendinous intersections, which render tl^em 

 more or less digastric. 



Origin. — From the superior part of the cariniform cartilage, 

 intimately blended with its fellow. 



Insertion. — By one tendon, to the postero-inferior part of the 

 thyroid cartilage, and by the other to the spur process of the os 

 hyoides. 



Relation. — Inferiprly with the sterno-maxillaris ; superiorly 

 with the trachea. 



Action. — It depresses the hyoid bone, and with it the larynx 

 and base of the tongue. 



