36 THOMAS DWIOIIT OX 



Coraco-hrachicdix arises from the coracoiil and from the internal border of the 

 short head of the l)iceps for some 4 inches. It is pierced by the museuh>cutaneons 

 nerve. It divides into two parts. One, tendinous, is inserted into the inner part of the 

 front of the humerus from a little above the middle to the junction of the second and 

 lower thirds or even further. The other part, chiefly muscular, is inserted into the 

 internal muscular septum in the lower third of the arm and b}- an expansion into the 

 fascia of the arm, being fused with the termination of the dorso-epitrochlearis. 



Triceps. The only point to be noted is that, besides its usual insertion, it expands 

 into the fascia of the back of the fore-arm. 



Pronator radii teres has two heads with the human relations to nerve and 

 artery {vide flexor carjyi radialis). 



Palmaris lomjus is inserted more to the radial side than in man. 



Flexor carpi radialis. Besides the usual origin it arises from the oblique line of 

 the radius by a fibrous layer which gives origin to the fibers of the pronator teres ; below 

 the oblique line it arises from the anterior border of the radius to within two inches of 

 the lower end. It is inserted into the base of the second metacarpal. This origin 

 resembles that seen in the gorilla but not in " Sally " nor in Hepburn's chimpanzee. 

 The insertion is the same as that seen in " Sally." In both respects it agrees with 

 Gratiolet and Alix's Troglodytes atibryi. 



Flexor carjn nlnaris. A tendinous slip arises high up from the deep aspect of its 

 ulnar aponeurosis of origin. From this a series of short muscular fibers run obli(iuely 

 downward and outward to another parallel tendon which, lying superficial to the flexor 

 tendons of the finsjers, is inserted into the annular ligament to the radial side of the 

 pisifoi'in, which bone receives the main tendon. The ulnar nerve comes to the surface 

 between the two tendons. (The deep tendon gives origin to some fibers of the flexor 

 sublimis digitorum.) 



This may be called either a double in-sertion of this muscle, or we may say tliat 

 there is an extra palmaris longus. Something resembling this seems to have been seen 

 in gorilla by Duvernoy. 



Flexor sublimis digitorum arises (1) from tlie common condyloid muscular 

 mass and septa within it, (2) from the coronoid, and (3) from the oblique line of the 

 radius. This head is attached also along the anterior Ijorder to within about 2 1-2 

 inches of the lower end. The tendon of the little finger arises from the superficial mass 

 on the ulnar side. The tendon of the annularis arises from the superficial mass more 

 anteriorly. It receives an insignificant reinforcement from the top of the oblique line 

 of the radius. The tendon of the middle finger receives its fibers from the coronoid head 

 and from practically the whole radial origin, whence the fibers run into the edge and 



