180 * MYOLOGY. 



SUBSCAPULO-HYOIDEUS. 

 (PL. n. 23.) 



More laterally situated than the last, this muscle is broad, 

 thin, and elongated, its fibres extending forwards and upwards. 

 Aponeurotic at its origin, it is followed by a long, flat, fleshy 

 belly, ending', in a flat tendon, which joins that of the stemo- 

 hyoideus. 



OHgin. — From the fascia covering the subscapularis muscle. 



Insertion. — To the inferior border of the spur process of the 

 OS hyoides. 



Relation. — Externally with the subscapularis, pectoralis parvus, 

 and sterno-m axillaris, blending also with the levator humeri; 

 internally with the muscles on the inner aspect of the shoulder, 

 the scalenus and rectus capitis anticus major, the trachea and the 

 carotid sheath. 



Action. — It depresses the hyoid apparatus. 



RECTUS CAPITIS ANTICUS MAJOR. 



( Trachelo-suhoccipitalis. ) 



(PL. III. 2.) 



This is the long flexor of the head, and is situated along the 

 anterior half of the region. It is long, and has a flattened, fleshy 

 belly, converging from two or three slips of origin, and teiminat- 

 ing anteriorly in a conical tendon. 



Origin. — Posteriorly, from the transverse processes of the 

 third, fourth, and fifth cervical vertebrsB. 



Insertion. — To the basilar process of the occipital and body of 

 the sphenoid bone. 



Relation. — Externally with the levator humeri, and subscapulo- 

 hyoideus ; internally witb its fellow and the longus colli ; 

 anteriorly with the gutteral pouch and carotid artery, and 

 superiorly with the occipito-atloid joint, and rectus capitis, 

 anticus minor. 



Action. With its fellow it flexes the head downwards ; when 



acting singly, it flexes it laterally. 



