THE EXTREMITIES OF ORYCTEROPUS CAPENSIS. 



">77 



to the coronoid process, but, as though vicariously, and AS an effort compensatory for 

 the single insertion of the biceps, sends a small oii'set to terminate at the radius, imme- 



Tamandua. Meckel states that 

 by a broad tendon. In the Ant 



diately below the tendon of the latter muscle 



This muscle is, according to Rapp l , wanth 

 in the Platypus, it is inserted into the rad 

 eater it is fused, he says, with the "elbow-head" of the biceps 2 . 



The brachialis antlcus is inserted, according to Tom-bet, into the ulna only, in Jf.jit- 

 bata. This muscle, he says, " se comportc avee la longuc portion du biceps OOninie le 

 fait la courte portion unie au coraco-brachial" 3 . 



Triceps. — This muscle may be described as composed of four factors or element , 



which are as follow : 



1. External head. — Arises from the posterior portion of the " anatomical neck " of 



humerus, partly fleshy, partly tendinous 



space 



intervening between the outer 



tuberosity and the head of the bone, overlapping here the 4 combined origin of the pre- 

 ceding muscle and the supinator longus. It takes origin, too, from the space included 

 between the articular head of the bone and the inner tuberosity, fusing here with the 

 highest fibres of origin of the internal factor of the muscle. Halfway down it receives 

 on its anterior free edge part of the tendon of the most posterior, or scapular, division 

 of the deltoid. It is finally inserted into the external aspect of the long olecranon pro- 

 cess of the ulna, fusing posteriorly, in the lower third of its course, with the anterior of 



muscle 



Its anterior free edge is continuous 



from the whole poster 



the two scapular divisions of the 



strong fascia covering the outer aspect of the arm. 



2. Internal head.— This portion of the muscle takes 

 surface of the humerus, and from the posterior edge of the supracondyloid ridge, nearly 

 as far as the inner condyle. It is crossed, at the junction of its upper with its middle 

 third, by the tendon of the latissimus dorsi, and is finally inserted into the posterior 

 part of the olecranon, fusing in front with the epitrochleo-anconeus and part of t\\afl 



pi 



d behind with the offset to the elbow, derived from the lat 



do 



(the dorso-epitrochlien). 



3. Anterior scapular div 

 human-anatomy nomenclat 



from the ant 



and middle thirds of the 



This, which appears to answer to the " long " head of 

 by far the largest element of the muscle. It arises 



xillary border of the scapula, being over- 

 es minor. It is inserted into the whole of 



lapped at the first half of its origin by the teres 



the posterior aspect of the olecranon, the outermost portion of its tendon occupyin 



kind of fossa at the back of the above pr 



At the junction of its superior with 



lv by the external humeral head, posteriorly by 



On looking at this factor of the muscl 



inferior half, it is joined anterio 



posterior scapular division, next to be described 



from the inner side of the arm, it will be seen to be made up of two portions, the poster 



of which receives into its anterior concave and semitendinous margin the poster 



nvex edge of the front porti 

 4. Posterior scapular divisi 



— Arises from nearly the whole extent of tin- poster 



1 0/>. cit. p. 48, 



Op. cit. p. 525 



3 



Op. cit. p. 10; see, too, pi. iii. 



4l2 



