ANATOMY OF THE ANTHROPOID APES. 207 



the exact manner of its origin. It is inserted on to the external third of the clavicle 

 and on to the greater part of the scapular spine. 



(8) Mhomhoicleus major. — This muscle arises below the last from the spines of the 

 cervical and first dorsal vertebra ; its line of origin measures three and a half inches ; 

 it arises by fleshy fibres, among which there is, here and there, a slight admixture of 

 tendon. It is inserted on to the posterior border of the scapula immediately above the 

 insertion of the serratus for a length of one and nine-tenths of an inch about two-thirds 

 of the length of the border of the bone. 



(9) Bhomhoideus minor. — This muscle, unlike rhomioideus major, has a distinctly 

 tendinous origin of about one quarter of an inch in length ; the muscle arises just 

 behind the rhomioideus major, but is not overlapped by it, except for about a quarter 

 of an incli anteriorly ; the origin of the muscle is about one and a quarter inch in 

 length. Its insertion is not very distinct from that of the last muscle ; it occupies the 

 rest of the posterior border of the scapula ; it overlaps the insertion of the last muscle 

 before they become joined. 



(10) Rhomioideus occipitalis, — This is a slender flat muscle, measuring nearly one 

 inch across at the origin from the occipital and gradually diminishing towards its 

 insertion. For the last inch and a half or so of its course it runs parallel to, and in 

 close contact with, the rhomhoideus major. But it is quite distinct from it, being not 

 flat but cylindrical, and ending in a longish and very narrow tendon of insertion on to 

 the extreme upper angle of the scapula. 



(11) Levator anguli scapula. — The insertion of this muscle is on to the outer angle 

 of the scapula just above the termination of the line of insertion of the serratus 

 magnus. 



(12) Omohyoid has a fleshy origin from a tubercle on the inferior border of the 

 scapula one inch from the glenoid fossa. 



(13) Serratus magnus arises from all twelve ribs and by twelve more or less marked 

 digitations ; the posterior four or five are less marked than those in front ; it is inserted 

 to the whole of the posterior border of the scapula along a line below the insertion of 

 the rho7nboideus, extending as far as the teres major in front. 



(14) Deltoid. — This muscle is very large; it arises from the last inch or so of the 

 clavicle, from the acromion, and from the spine and posterior border of the scapula, 

 mainly by a thin tendon which forms a fascia covering the underlying supra-spinatus ; 

 the latter origin forms an almost distinct head. The muscle is fleshy down to just 

 before its insertion ; the insertion is mainly on a rough triangular area, the deltoid 

 impression, which measures nearly two inches in length. A few fibres from the deltoid 

 are continued on to the hrachialis anticiis. 



(15) The teres major arises from an area of the scapula near the upper inner border 

 (axillary), from the axillary border itself, and from the septum between itself and the 

 infraspinatus, which is really, as has already been pointed out, partly the origin of ^^ 



