104 MUSCULAR SYSTEM. 



LEVATOR HUMERI. — Cervico-subscapu/aris. 



Situatiou. — Antero-inferior and lateral parts of the neck. 



Form. — Flattened, elongated : broadest and thickest at its 

 posterior and inferior parts. 



Attachment. — Superiorly and anteriorly, to the tubercle of the 

 occiput, to the mastoid process of the temporal bone, to the trans- 

 verse process of the atlas, and those of the second, third, and 

 fourth cervical vertebrae; laterally, from the ligamentum nuchse 

 and faschia covering the side of the neck ; inferiorly and poste- 

 riorly, loosely to the head of the humerus, to the scapular faschia, 

 to the muscles about the point of the shoulder, and ultimately to 

 a ridge upon the body of the humerus, which arises from its 

 greater tubercle. 



Relations. — The jugular vein runs along its antero-inferior 

 border, and is covered by it for three-fourths of its length down- 

 wards. The subcutaneous branches of the cervical nerves pierce 

 its substance and ramify upon its surface. Superiorly and pos- 

 teriorly, it is opposed to the splenius ; inferiorly and anteriorly, 

 to the sterno-maxillaris; on its outer side, to the panniculus ; on 

 its inner side, to the rectus capitis anticus major, and to the sca- 

 lenus. Its antero-inferior margin is thin and expanded, and 

 clips inward, forming a thin fleshy partition between the carotid 

 artery and jugular vein. 



Direction. — Longitudinal : sloping with the neck. 



Structure. — Anteriorly it is split into two portions, both thin 

 and aponeurotic at their extremities. Its middle part is thick 

 and entirely fleshy, but upon the arm becomes aponeurotic. 



Action. — To raise the shoulder and arm, and at the same time 

 draw them forwards : or, these parts being fixed, to turn the 

 neck, and head also, to one side ; or, should both act, under such 

 circumstances, the head will be depressed. 



Remark. — Professor Girard considers the fleshy expansion be- 

 tween the artery and vein as a distinct muscle, and names it the 

 subscapulo-hyoideus : and so it would seem most natural to 

 regard it. 



2, — LATERAL CERVICAL REGION. 

 SPLENIUS. — Cervico-mastoideus. 

 Situation. — Occupying the whole of the superior and lateral 

 parts of the neck. 



Form. — Irregularly quadrangular; the supero-lateral portion 

 being acute and extended : thick in substance and flattened upon 

 the sides. 



AttacJunent. — Superiorly, to the ligamentum colli, reaching as 



