Tin: MI & i 



8. Coracii-itiiiiuTdli*. <'<>r<irn-lir<i<-l/i<tli.-<. <T ( hii'iliriK-Jt/'ili*. ( ]''ir. 121. : 

 yms. Coracti-lttniit'i-tili* !'< n-inill. Mitltlli tcaptiio-lutateralU ].<i/l(. 



Volume Situatum Directi<m.~A small < ] minuted inusele, \\liidi ap- 

 ]>ears to belong to the arm rather than the shoulder, as it is situated at the 

 internal face of the humerus, whoso direction it slightly crosses. If it is 

 described as in the subscapular region, it is because of its attachments and 

 action, which arc, in every respect, analogous to those of the other muscles 

 of the shoulder. 



Attachments Form Structure. It commences on the beak of the 

 coracoid process by a small flat tendon, which is at first included In t\\e< n the 

 supraspinatus and subscapularis, but afterwards leaves the interstice fornn d 

 by these two muscles, to glide and bo inflected over the terminal tendon of the 

 latter. This small tendon is succeeded by two muscular branches, one d. ;.. 

 the other superficial. The first is a wide, thin, and short band, almost 

 entirely muscular, attached to the body of the humerus above the internal 

 tuberosity. The second forms a fleshy body of a certain thickness, flattened 

 on both sides, and strongly aponeurotic ; the fasciculi composing it arc 

 longer as they are more posterior, and are inserted, by their inferior extre- 

 mities, into the imprints on the anterior face of the humerus. 



Relations. This muscle is covered by the coraco-radialis, and by the 

 sterno-trochineus, which is partly attached to its tendon. It covers the 

 internal insertion of the subscapularis, the humerus, the common tendon of 

 the great dorsal, and the adductor of the arm, and a small portion of the 

 short flexor and middle extensor of the fore-arm. Its posterior border is 

 margined by the vascular and nervous trunks on the inner aspect of the arm. 

 The anterior humeral nerve passes between its two branches, along with an 

 arterial and venous ramification. 



Action. It is an adductor of the arm, and makes it also pivot inwards. 

 Its direction and the disposition of its attachments do not permit it to 

 produce rotation outwards, though it has been stated to do so by several 

 authors. 



4. Small Scapulo-lmmeralis. 



{Synonyms. Not mentioned by Percivall. Leyh, in addition to the above designation, 

 names it the tensor of the capsular ligament.) 



The scapulo-humeralis gracilis is a very small cylindrical fasciculus, 

 comprised between the large extensor of the fore-arm and the capsule of the 

 scapulo-huineral articulation ; deriving its origin above the margin of the 

 glenoid cavity of the scapula, and terminating below the head of the humerus 

 by a thin tendon, which insinuates itself between the fibres of the short 

 flexor of the fore-arm. This muscle appears to bo peculiar to Solipcds, and 

 has been regarded by Rigot as intended to raise the capsule of the scapnlo 

 humeral articulation during flexion, so as to prevent its being pinched 

 between the articular surfaces. 



DIFFERENTIAL CHARACTERS OF THE MUSCLES OF TUB SHOULDER IN OTHER THAN BOI.IH:i> 



ANIMALS. 



The Carnicora arc the only animals which oiler somewhat notable dilli r< !!<. - In 

 tin- muscles of the: .shonlilrr. 



Tims, the /"//;/ <il><li-/,,r <>!' tin ,in,i. MTV clr\rlo|>.-<l. him an anterior |Krtini arising 

 lin-ctly i'roni the acroiiiiun, an<l a ]>-t ri.>r |".iti"ii whirh -jirin^'s from the whnlu exti-nt 



