578 MR. J. C. GALTON ON THE MYOLOGY OF 



third of the axillary costa of the scapula, and soon joins the latlssimus dorsi, at the 

 point where this latter gives off the dorso-epitrochlien detachment for the elbow. 



If this factor of the triceps be regarded from the onter aspect of the arm, it will appear 

 to be joined at the middle third of its hinder margin by the latlssimus dorsi as this 

 muscle passes up towards its insertion. On surveying it, however, from the inner 

 side, the latter muscle, just before it becomes tendinous, will be seen in intimate 

 relation with the inner face of its middle third. 



The teres major, as already described, is, at its origin, completely fused with this 

 division of the triceps. Prof. Humphry, in his description of the triceps \ states that 

 this factor is " confluent, to some extent, with the latlssimus dorsi." 



Rapp, in the course of his description of the muscles of M. tamandua, remarks 2 , that, 

 besides the triceps, there is a longer muscle, which is, moreover, much thicker than the 

 foregoing, and is partly covered by it. It springs from the scapula, in close company 

 with the teres major, and is inserted into the olecranon. A portion of its tendon passes 



to the fascia of the forearm, " die er spannen kann 

 Pouchet describes 3 a similar muscle, as present in the Great Anteater, under the 

 name of "accessoire interne" (of the triceps), which he regards as synonymous with a 

 muscle represented in one of Cuvier's plates of the myology of the Tamandua (op. cit. 

 pi. 261. fig. 1), under the following designation :— « Triceps, portion allant au tendon du 

 grand dorsal, dit quatrieme extenseur." 



This muscle appears, from Pouchet's figures, to be the dorso-epitrochlien, reinforced by 

 a scapular contingent, since some of its fibres are continuous above with the latlssimus 

 dorsi, while its termination is at the elbow. This author, however, regards it as » un 



organe qu'on pourrait a un autre point de vue rattacher au systeme des muscles 

 pouciers." 



Epitrochleo^nconem.- This muscle, which is represented by Cuvier as a division of 



the internal humeral factor of the biceps \ is very fairly developed. It arises from the 

 strong tubercle in which the supracondyloid ridge ends, immediately above the inner 

 condyle of the humerus, just posterior to the origin of the pronator fcm-and terminates 

 at the hamular projection of the olecranon, becoming first blended with the inner 

 humeral factor of the triceps, and with the ulnar head of origin of the Jlexor profundus. 

 It has the usual relation to the ulnar nerve. Cuvier represents it as too broad at its 

 origin. Prof. Humphry describes this muscle », under the name of anconeus intern**, as 

 an element (which it certainly is) of the triceps ; and mentions, in a foot-note, that it is 

 synonymous with the epitrochleo-ctnconeus, « found not unfrequently in the human 

 subject Rapp describes this muscle, independently of the triceps, as occurring in the 

 1 amandua, under the name of " anconeus parvus " « 



A similar muscle is described by Pouchet ' as a factor of the triceps, under the designa- 

 tion of 'Taste interne." It is, according to him, - tres-court et forme le pendant de 



■» It, moreover, " cache en partie le flechisseur commune des doisrts. il en est 



1 



:101 



Op 



Op. cit. p. 48. • Qp. cit. p. 12, and pi. iii. fig. 1. 



»• «<• p. n, ,a pl i, % . ,. ^■c.v.m. . 0j , a, P . «. 



