. An introduction to the osteology of the mammalia . ; t great trochanter ; t third trochanter. mere rough ridge. The inner edge of the anterior part ofthe inferior articular surface is very prominent. In all thePerissodactyles there is a strongly marked third trochanter(/), in the form of a compressed ridge curving is entirely absent in all the known Artiodactyles. The fibula is subject to great variations among the differentmembers of the order. In the Rhinoceros, Tapir, Pig, and 334 THE THIGH AND LEG. [CHAP. Hippopotamus it is complete and distinct, though slenderin proportion
. An introduction to the osteology of the mammalia . ; t great trochanter ; t third trochanter. mere rough ridge. The inner edge of the anterior part ofthe inferior articular surface is very prominent. In all thePerissodactyles there is a strongly marked third trochanter(/), in the form of a compressed ridge curving is entirely absent in all the known Artiodactyles. The fibula is subject to great variations among the differentmembers of the order. In the Rhinoceros, Tapir, Pig, and 334 THE THIGH AND LEG. [CHAP. Hippopotamus it is complete and distinct, though slenderin proportion to the tibia. In the horse a mere styli-formrudiment of the proximal end is present. In all Pecora and Tylopoda, a small distinct bone, havinga very definite form, articulating with the lower end of thetibia, and forming the external malleolus, appears torepresent the distal extremity of the fibula (see Fig. 119).There is occasionally in addition a slender styliform rudi-ment of the proximal extremity, but the two are never unitedtogether by FIG. 119.—Anterior aspect of lower end of the right tibia and fibula of Red Deer \Cervus elaphiis), J. t tibia ; f fibula. In the Tragulina the fibula is long and slender, and com-plete, but its lower end is indistinguishably blended withthe tibia. The patella is well ossified, and usually somewhat trian-gular, with the broad end upwards ; but fabellas are notcommonly developed in the Ungulata. In the Hyrax there is a slight ridge on the femur in theplace of a third trochanter. The fibula is complete, andthickest at its proximal end, where it generally ankyloseswith the tibia. The styloid process of the tibia articulates bytwo facets with two corresponding surfaces of the astragalus. XVIII.] CETACEA. 135 The femur of the Elephant is long and very straight; theaxis of the head is more in a line with that of the shaft thanusual. The great trochanter is not much developed, andthe small trochanter is nearly obsolete. The fibula is com
Size: 1459px × 1713px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbones, bookyear1885
