| OCR Text |
Show 692 MR. F. G. PARSONS O N T H E [June 16, fibular joint has anterior and posterior ligaments; its synovial cavity is in direct communication with the knee-joint. The Ankle-joint has feeble anterior and posterior as well as strong lateral ligaments. The internal lateral consists of a superficial and a deep portion; the former is a narrow flat band which passes from the back of the internal malleolus downward and forward to the navicular ; the deep is much broader and stronger and runs downward and backward from the anterior part of the side of the malleolus to the sustentaculum tali, forming an X with the superficial part. The external lateral ligament consists of three bundles-superficial, middle, and deep ; the superficial passes from the back of the external malleolus to the outer side of the calcaneum just behind the articulation with the cuboid ; the middle is thicker aud stronger, and runs downward and backward from the anterior part of the malleolus to the prominent tuberosity on the outer side of the calcaneum, crossing the superficial bundle to form an X ; the deep band run3 almost directly backward from the posterior part of the malleolus to the outer side of the astragalus. Fig. 6. Ankle-joint of Petroyale, from the inner side. In the Foot there are two calcaneo-cuboid ligaments, the outer of which is very strong and runs from the under surface of the calcaneum to the cuboid and on to the bases of the fourth and fifth metatarsals. The inner is much smaller and passes from the sustentaculum tali to the bases of the second and third metatarsals and slightly to the cuboid. As the inner longitudinal arch ot the Kangaroo's foot is not developed, the calcaneonavicular ligament is not very strong. The mechanism of the Kangaroos toot is interesting, and I hope to deal with it more fully in a subsequent paper. |
