LATEBAL CEEVICAL GROUT, 183 



Action. — It flexes the neck downwards, and moves one vertebra 

 on another. 



Lateral Ceevical Group. 



This is a numerous group, but one difficult of satisfactory suo- 

 division. The following Table enumerates the muscles in the 

 order in which they may be conveniently demonstrated : — 



Levator humeri. 

 Trapezius cervicalis. 

 Rhomboideus longus. 

 Serratus magnus (a portion). 

 Splenius 



Trachelo-mastoideus. 

 Complexus major. 



Complexus minor. 

 Rectus capitis posticus major. 

 Rectus capitis posticus minor. 

 Obliquus capitis anticus. 

 ObUquus capitis posticus. 

 Spinalis colli. 

 Litertransversalis colli. 



LEVATOR HUMERI. 



(Mastoido-humeralis.) 



(Pl. IL 12.) 



Occupying the infero-lateral part of the neck, this muscle is 

 large, flat, and elongated, extending downwards from, the back of 

 the head to the arm. Its fleshy portion is divisible into deep 

 and superficial parts, the first being placed anteriorly. 



Attachments. — Anteriorly, by one tendon to the crest of the 

 occiput and the mastoid process of the temporal bone ; by the 

 other to the wing of the atlas, this tendon being also common to 

 the splenius and trachelo-ma,stoideus ; to the transverse processes 

 of the second, third, and fourth cervical vertebrse, and the fascia 

 of the neck. Covering the shoulder joint, it is attached to a line 

 extending downwards from the deltoid ridge ; and to the fascia of 

 the muscles of the shoulder and arm, joining the scapular fascia 

 by an aponeurotic expansion continuous also with the fascia of the 

 cervical trapezius. 



Relation. — Externally with the panniculus ; inferiorly with 

 the carotid artery, jugular vein, and stemo-maxillaris ; internally 

 with the splenius, trachelo-mastoideus, rectus capitis anticus major, 

 scalenus, serratus magnus, and other muscles ; anteriorly with the 

 parotid gland. It is connected with the ligamentum nuchas by 

 the aponeurosis of the panniculus, and infero-laterally becomes 



