180 



SUBSC APULO -H YOIDEUS. 

 (Pl. II. 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, extending in a flat tendon, which joins that of the sterno- 

 hyoideus. 



Origin. — 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-maxillaris, 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'Suhocclintalis.) 

 (Pl. III. 2.) 



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

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

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

 ing anteriorly in a conical tendon. 



Origin. — Posteriorly, from the transverse processes of the 

 third, fourth, and fifth cervical vertebrae. 



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

 the sphenoid bone. 



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

 hyoideus ; internally with its fellow and the longus colli ; 

 anteriorly with the guttural 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. 



