316 MUSCLES OF THE PIG 



The flexor carpi externus (M. extensor carpi ulnaris) is covered by a thick, 

 tendinous band, which extends from the extensor epicondyle to the accessory carpal 

 bone and outer aspect of the carpus. The tendon of the muscle perforates this 

 band in the distal part of the forearm and ends on the proximal end of the fifth 

 metacarpal bone. 



The superficial digital flexor has two bellies. The tendon of the superficial 

 head passes down behind the posterior annular ligament of the carpus (bound 

 down by a special annular ligament), forms a ring at the fetlock for a tendon of 

 the deep flexor, and ends by two l^ranches on the second phalanx of the fourth 

 digit. The tendon of the deep head, after detaching a slip to the tendon of the 

 deep flexor, passes down with the latter (for which it forms a ring), and ends on 

 the third digit. 



The deep digital flexor has three heads — humeral, ulnar, and radial. The 

 common tendon divides into four branches, the larger central pair ending on 

 the third phalanges of the principal digits, the smaller pair on the accessory 

 digits. The latter are bound down by a peculiar spiral band. There is no check 

 ligament. 



The lumbricales are represented by bundles which extend from the tleep flexor 

 tendon to the tendon of the deep head of the superficial flexor. 



The third and fourth interossei are present. Each sends two slips to the cor- 

 responding sesamoid bones and extensor tendon. 



There are flexors, adductors, and abductors of the second and fifth digits. 



Muscles of the Pelvic Limb 

 sublumbar muscles 



The psoas minor is intimately united with the psoas major in front, and has a 

 long small tendon which ends on the psoas tubercle. It has no thoracic part. 



The psoas major is large and rounded. It begins at the last rib. 



The quadratus lumborum is well developed, and extends forward as far as 

 the twelfth rib. 



MUSCLES OF THE HIP AND THIGH 



The tensor fasciae latae is broad, and its fleshy part reaches almost to the pa- 

 tella. 



The gluteus superficialis has a sacral head only; it blends with the biceps 

 femoris. 



The gluteus medius has a small lumbar part which does not extend so far 

 forward as in the horse. The deep part (Gluteus accessorius) is pretty clearly 

 marked. 



The gluteus profundus is extensive, reaching nearly to the external angle of the 

 ilium. 



The biceps femoris has a narrow origin from the sacro-sciatic ligament and 

 tuber ischii. It ends below like that of the ox. 



The semitendinosus resembles that of the horse. 



The semimembranosus has two insertions as in the ox. 



The sartorius has two heads of origin, between Avhich the external iliac vessels 

 are situated. The inner arises from the tendon of the psoas minor, the outer one 

 from the iliac fascia. 



The graciles are united at their origin even more than in the ox. 



The pectineus is well developed and is flattened from before l^ackward. 



The adductor shows no division and is partially fused with the gracilis. It 

 ends on the femur just above the origin of the gastrocnemius. 



