. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MARSUPIALIA. behind the inner malleolus, and is inserted into the inner or tibial cuneiform bone. The muscle which has the relative position and origins of the flexor longus polticis, sends its tendon by the usual route to the sole of the foot, where it divides and distributes a flexor tendon to all the toes except the rudimental hallux; it has the same disposition in the Opossums, where the hinder thumb or great toe is fully developed; for this modification, however, the Comparative Anatomist is already prepared by meet
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MARSUPIALIA. behind the inner malleolus, and is inserted into the inner or tibial cuneiform bone. The muscle which has the relative position and origins of the flexor longus polticis, sends its tendon by the usual route to the sole of the foot, where it divides and distributes a flexor tendon to all the toes except the rudimental hallux; it has the same disposition in the Opossums, where the hinder thumb or great toe is fully developed; for this modification, however, the Comparative Anatomist is already prepared by meeting with it in the first step from man, viz. in the Chimpanzee and Orang.* The third deep-seated muscle, being situ- ated internal to the two preceding ones, may be the analogue of the flexor digitorum commu- nis longus; it nevertheless sends no tendon to the toes nor even to the tarsus, but its fibres pass from the tibia obliquely outwards and down- wards between the preceding muscle and the interosseous ligament to the fibula, where they are exclusively inserted so as to oppose the plantaris and rotate the foot outwards. This muscle closely adheres to the interosseous fascia, and thus resembles in its attachments the pronator quadratus of the fore limb : it is most developed in the pedimanous climbing Marsupials, where the rotation of the foot is more extensive and more useful. The subjoined illustration (Jig. 113) of this modification of the muscles of the hind-foot is taken from a dissection of the Pkalangista vul- pina, which very closely accords with that above described in the Duxyurus macrurus: a, expanded tendon of the sartorius; b, gracilis; c, Semitendinosus ; and d, semi-membranosus; both these muscles are inserted, as in many other quadrupeds, low down the tibia : e, gas- trocnemius; J\ plantaris; g, the analogue of the flexor longus pollicis pedis; h, tibialis posti- cus; this muscle divides and is inserted by two tendons, A'and //', into the internal and middle
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