MUSCLES OF THE ANTERIOR LIMBS. 



275 



4. The superficial flexor or perforatus has two planes of muscular fibres. The super- 

 ficial plane is destined to the tendons of the medius aiui annuiaris ; the deep plane to the 

 lendons of the index and little finger. Thete tendons are fixed into the secondary 

 phalanges of the above-named digits. 



5. Tlie anterior ulnar resembles the oblique flexor of the metacarpus of the Horse. 

 It is inserted, above, into the epitrochlea and the olecranon ; below, in the pisiform bone. 

 Its action is transmitted, by a fibrous band, from this bone to the fifth metacarpal. 

 It flexes the hand by inclining it inwards. 



Fig. 126. 



Fig. 127. 



SUPERFICIAL MUSCLES OF HUMAN FORE-ARM. 



1, Biceps, with its tendon ; 2, Brachialis an- 

 ticus ; 3, Triceps ; 4, Pronator radii teres ; 

 5, Flexor carpi radialis ; 6, Palmaris lon- 

 gus; 7, A fasciculus of flexor sublimis 

 digitorum; 8, Flexor carpi ulnaris; 9, 

 Palmar fascia; 10, Palmaris brevis; 11, 

 Abductor pollicis ; 12, Flexor brevis pol- 

 licis ; 13, Supinator longus ; 14, Extensor 

 ossis metacarpi, and extensor primi inter- 

 nodii pollicis. 



DEEP LAYER OF SUPERFICIAL MUSCLES OP 

 HUMAN FORE-ARM. 



1, Internal lateral ligament of elbow joint ; 

 2, Anterior ligament ; 3, Orbicular ligament 

 of radius ; 4, Flexor profundus digitorum ; 

 5, Flexor longus pollicis ; 6, Pronator quad- 

 ratus ; 7, Adductor pollicis ; 8, Dorsal in- 

 terosseous of middle, and palmar inter- 

 osseous of ring finger; 9, Dorsal inter- 

 osseous muscle of ring-finger, and palmar 

 interosseous of little finger. 



6. The deep flexor or perforans is resolved into two fasciculi : one, the internal, for 

 the little finger, the annuiaris. and the medius the other, the external, for the index. 

 The three first tendons are sit first united to each other by fibrous bands, and together 

 pass through a sheath formed by the perforatus. 



7. The proper flexor of the thumb, represented in the Dog by the radial portion of the 

 perforans. It is attached, for one part, to the upper three-fourths of the anterior face of 



