180 MYOLOGY. 



SUBSCAPULO-HYOIDEUS. 

 (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-suboccipitalis.) 



(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. 



