MUSCLES OF THE TRUNK. 



267 



1. Muscles of the Back and Cervix. 

 In the trapezius of Man, a cervical and a dorsal portion can no longer be distinguished. 

 Abo\ie, it is attached to the superior occipital curved line ; below, it is fixed to the external 

 third of the upper border of the clavicle, and to the acromion and scapular spine. The fibres 

 of the trapezius, which are fixed into the clavicle, represent a portion of the mastoido-humeralia 

 , of quadrupeds. 



The latissimus dorsi resembles that of the Dog and Pig, its fleshy portion being very 



Fig. 164. 



FIRST, SECOND, AND PART OF THIRD LAYER OF MUSCLES OF THE BACK OF MAN; THE FIE8T 

 LAYER OCCUPIES THE RIGHT, THE SECOND THE LEFT SIDE. 



Trapezius ; 2, tendinous portion, forming, with a corresponding part of the opposite muscle, the 

 tendinous ellipse on the back of the neck ; 3, acromion process and spine of scapula ; 4, latissimus 

 dorsi ; 5, deltoid; 6, muscles of dorsum of the scapula (infra-spinatus, teres minor, and teres 

 major; 7, obliquus externus; 8, gluteus medius ; 9, glutei maximi ; 10, levator anguli scapulae; 

 11, rhomboideus minor; 12, rhomboideus major; 13, splenius capitis, overlying the splenius, 

 above; 14, splenius colli, partially seen (the common origin of the splenius is attached to the 

 spinous processes below the origin of the rhomboideus major) ; 15, vertebral aponeurosis ; 16, 

 serratus posticus inferior; 17, supra-spinatus ; 18. infra-spinatus; 19, teres minor; 20, teres 

 major; 21, long head of triceps, passing between teres minor and major to the arm; 22, serratus 

 magnus, proceeding forwards from its origin at the base of the scapula ; 23, obliquus internus 

 abdominis. 



developed ; it is attached to the external face of the four last ribs by muscular digitations, and 

 terminates on the border of the bicipital groove. 



The rhomboideus is bifid, as in the smaller Quadrupeds. Less developed than in these 

 animals, the levator anguli scapulx is only fi.xed iu front to the four first cervical vertebrae. 



In Man, the splenius is large, but by its insertions it resembles that of Solipeds. The 

 complexus, thick and broad above, is incompletely divided into two fleshy bodies, which are 



