no MUSCULAR SYS'I'EM. 



vagura, great sympathetic nerve, and, lower down, the jugular 

 vein. The cervical nerves going to form the axillary plexus 

 cross the scalenus in their descent ; and the axillary artery 

 and vein turn round the first rib immediately beneath its postero- 

 inferior extremity. 



Striictuie. — Constituted of two or three cylindroid divisions, 

 lying one upon the other : its base is tendinous as well as fleshy : 

 its cervical attachments are mostly fleshy. 



Actio)!. — It will aid in the depression of the neck ; and may 

 also have some effect, the neck being fixed, in inspiration, by 

 having a tendency to draw the rib forwards. 



LONGUS COLLI. — Subdorso-alloideus. 



Structure. — Deep-seated : extending along the inferior part of 

 the neck, and thence for some distance along the back. 



Form. — Complicated : made up of many semi-cylindroid fas- 

 ciculi running obliquely one into the other : altogether, broad in 

 the middle and tapering at either extremity. 



Attachment . — Posteriorly, to the bodies of the six anterior- 

 most dorsal vertebrae : anteriorly, to the bodies, transverse pro- 

 cesses and inferior spines, of all the cervical vertebrae, excepting 

 those of the first ; it being fixed by a strong tendon to the body 

 oiili/ of the atlas. 



Relations. — On the outer side it has, posteriorly, the scalenus ; 

 anteriorly, the rectus anticus major: below it, lies the trachea ; 

 above it, the vertebrae. 



Structure. — The dorsal portion is pretty uniform, and is prin- 

 cipally fleshy ; the cervical part is convoluted, and the fibres are 

 intersected with alternate layers of tendon. The anterior end is 

 entirely tendinous; the other part has also a tendon fixing it to 

 the Gth cervical vertebra. The fasciculi run from one cervical 

 transverse process to the other. 



Action. — Its many and extensive attachments, and the prox- 

 imity of the points on which it acts, render it a muscle of con- 

 siderable power and etl'ect in the flexion of the neck : the rainbow 

 curve, and the constrained inflexion of the head towards the 

 breast, are chiefly attiibutable to its full and forcible contrac- 

 tions. 



6.— INFERIOR CERVICO-OCCIPITAL REGION. 



RECTUS CAPITIS ANTICUS MAJOR. — Trachelo-suboccipitalis. 



Situation. — Deep-seated : antero-lateral part of the neck. 



Form. — Pyramidal : base turned forwards. 



Atlac/iment. — Posteriorly, to the transverse processes of the 



