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



insertion, partly fleshy, partly tendinous, into the whole of the upper part of the outer 

 tuberosity of the humerus. 



Infraspinatus. — A large muscle, having the usual origin in the fossa from which it 

 derives its name. It is inserted into the external tuberosity of the humerus by a broad 

 strong tendon, which, just before its termination, passes over a facet, somewhat reniform 

 in outline, situated on the outer aspect of the tuberosity, a bursa being interposed. 



Teres minor. — A short, triangular muscle, arising from the outer edge of the anterior 

 third of the axillary costa of the scapula, and overlapping the anterior half of the origin 

 of the "long" head of the triceps. It passes forwards to be inserted fleshy into the 

 humerus, immediately below the facet mentioned in connexion with the preceding 

 muscle. From the middle of the inferior edge of the muscle passes a strong tendon to 

 the "metacromial process" of the scapula. 



Su bscapu la ris. — This muscle takes its usual origin from the inner surface of the 

 scapula, and is inserted by a strong tendon into the inner tuberosity of the humerus. 



Teres major.— A somewhat narrow muscle of nearly uniform width, arising from the 

 lower third of the inner edge of the axillary border of the scapula, and being completely 

 fused at origin with the inferior edge of the subscapular, and with that posterior 

 element of the triceps with which the latissimus dorsi is conjoined, before this latter 

 detaches from itself the dorso-epitrochlien. It passes forwards, being applied closely to 

 the tendon of the latissimus dorsi, to be inserted tendinously into the bicipital groove, a 

 little below the inner tuberosity of the humerus, its tendon lying above that of the last- 

 mentioned muscle, but being slightly overlapped by it on its lower edge. 



Rapp describes in the Tamandua a fusion of the tendon of the teres major with the 

 latissimus dorsi, before it terminates at the humerus 1 . 



Zatissinms dorsi.-This muscle appeared to take origin from strong aponeurotic fascia 

 attached to the lower half of the dorsal portion of the vertebral column covered by the 

 trapezius, also from the lumbar fascia, from which the above muscle also takes orig" 

 and is covered moreover, by the ascending portion of the dermo-humerien, which 

 closely adherent to it. 



Some fibres arise from the tenth, eleventh, and twelfth ribs, interdicting with the 



of the obhqnus_ externus. This eostal origin does not appear to have existed in 



IS 



D 



Prof. Humphry's specimen 



The muscle then passes upwards to be inserted into the inner edge of the bicipital 

 groove of the humerus, fusing first with the lower border of the teres lajor, and detach- 

 mg just before . becomes tendinous, a large muscular contingent (the dorso-e P i IroeW e n) 



Lin nT 7 ^ bef ° re inSerti ° D ' W " h the P° st " riOT I"* ^ the scapular 



oX 7f rn X T- , <W *«™« fe » *> moreover, joined bv fibres which take 



ZLL S f * n ° r "I 6 ° f the SCapUla - Th6Se Wil1 be ™™ m noticed in the 

 descnpt.on of the tnceps The dorso-epitrochlien is most apparent, from the outer aspect 



anlr 12 aS , t ? SmS ° ^ latMmUS dmi ' f ° r > ° n ™™S «* from the inner side, it 



TZIT 6 t0 an element ° f the trice e*> ™ th the above muscle closely applied to 



1 Op. cit. p. 47. 



