ANATOMY OF THE ANTHROPOID APES. 211 



widest part ; it becomes tendinous about halfway down the arm ; the tendon is inserted 

 on to the palmar fascia just at the wrist. 



(37) Flexor carpi ulnaris. — This muscle arises from the flexor condyle of the 

 humerus, from the fascia covering the forearm, from the septum between itself and the 

 flexor sullimis, and from the first two-thirds of the ulna; its tendon of insertion (on to 

 pisiform) is very short and strap-shaped. 



(38) Flexor sublimis {perforatus) du/itoru7n arises from the flexor condyle between 

 the fiexor ulnaris and flexor carj)i radialis, from the septum between itself and these 

 muscles and also the flexor profundus, and from a part of the radius behind the 

 insertion of the pronator radii teres ; it separates into four tendons in front of the wrist, 

 each of which is inserted on to the second phalanx of digits ii.-v., being perforated 

 by the tendon of the flexor profundus. All four tendons are approximately equal 

 in size. 



(39) Flexor profundus [perforatus) digitorum. — This muscle appears to represent 

 both the muscle so called and the flexor poUicis longus of human anatomy, since it 

 arises both from the radius and ulna ; it also arises from the interosseous ligament, 

 and from the septa between itself and adjacent muscles. The muscle itself divides 

 into four some way in front of the wrist ; of these divisions those belonging to the 

 tendons of digits ii. and in. are the most prominent, each with a glistening tendinous 

 surface beneath. The tendons of the two outer digits arise earlier than the other two, 

 from the common muscular mass ; the four tendons are associated in pairs, those of the 

 two outer digits forming one pair, those of the two inner digits another pair. Each 

 tendon is towards its insertion not obscurely grooved upon the under surface ; more 

 distally still the two halves of each tendon are easily separable ; each is inserted on to 

 the terminal phalanx. A small muscular slip arises from the fourth muscle and passes 

 into a long fine tendon, which joins the tendon of the fourth digit some waj beyond 

 the origin of the lumbricales. 



(40) The lumbricales are four in number ; each passes from the deep flexor to the 

 extensor tendon on the dorsal side of the first phalanx of its digit. 



(41) The pronator quadratus is about an inch and a half in length ; it passes across 

 from the radius to the ulna at the wrist end of these bones. 



§5. The Muscular Anatomy of the Hind Limh. 



(1) Glutceus maximus. — This muscle has an extensive tendinous origin from the 

 anterior and posterior border of the ilium, and an entirely fleshy origin from the 

 coccyx ; the tendon of insertion rapidly narrows towards the actual insertion. 



(la) Ischio-femoraV. — This muscle arises in common with the three next muscles 

 from the tuber ischii; its fleshy insertion is on to the femur just above the origin of 



' I use the name given by MM. Gratiolet and Alix {loc. cit. on p. 180 of this memoir). 



2h2 



