. Elementary physiology . Fig. 35.—Sagittal section of the ankle-joint and articulations of the right foot, a little to the inside of the middle of the great toe. (Allen Thomson.) \ 1, synovial cavity of the ankle joint; 2, posterior astragalo-calcaneal articulation; 3, 3', astragalo-calcaneo-navicular articulation : the interosseous ligament is seen separating 2 from 3'; 4, inferior calcaneo-navicular ligament; 5, part of the long plantar ligament; 6, naviculo-cuneiform articulation; 7, first cuneo-metatarsal articulation ; 8, first metatarso-phalangeal articulation ; . 9, section of the inne
. Elementary physiology . Fig. 35.—Sagittal section of the ankle-joint and articulations of the right foot, a little to the inside of the middle of the great toe. (Allen Thomson.) \ 1, synovial cavity of the ankle joint; 2, posterior astragalo-calcaneal articulation; 3, 3', astragalo-calcaneo-navicular articulation : the interosseous ligament is seen separating 2 from 3'; 4, inferior calcaneo-navicular ligament; 5, part of the long plantar ligament; 6, naviculo-cuneiform articulation; 7, first cuneo-metatarsal articulation ; 8, first metatarso-phalangeal articulation ; . 9, section of the inner sesamoid bone; 10, interphalangeal articulation; 11, placed on the calcaneum, indicates the bursa between the upper part of the tuberosity of that bone and the tendo Achillis. This brief outHne of the structure of the skeleton may be concluded with the following classification of the articulations :— Articulations are divided into two classes—viz. synarthroses, or continuo2Ls articulations; and diarthroses^ or discontinuous articulations. In a synarthrosis the bony surfaces are fixed together either directly or by some interposed substance, such as a disc of cartilage. The two most frequent forms of synarthrosis found in the body are the suture and the symphysis. The suture is met with only in the case of the skull-bones. In this form of articulation the opposed surfaces of bone practically come in contact, being only separated by a thin layer of fibrous tissue. The edges of the bones where they come in contact are often deeply indented or serrated^ so as to firmly interlock with each other. In other cases the edges are thin and bevelled, to meet each other, forming a squamotis suture ; or they may be grooved, forming 2i grooved suture.
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Keywords: ., bookcentury1800, bookdecade1890, bookpubli, booksubjectphysiology
