. The anatomy of the domestic animals . Veterinary anatomy. 118 THE SKELETON OF THE HORSE The distal extremity is fused with the tibia, constituting the lateral malleolus. Development.—This resembles that of the ulna. The embrj^onic cartilaginous fibula extends the entire length of the leg, but does not articulate with the femur. The distal part of the shaft is usually reduced to a fibrous band. Three centers of ossification appear, one each for the shaft and the extremities. The distal end unites early with the tibia, forming the lateral malleolus. It is interesting to note that in some cases
. The anatomy of the domestic animals . Veterinary anatomy. 118 THE SKELETON OF THE HORSE The distal extremity is fused with the tibia, constituting the lateral malleolus. Development.—This resembles that of the ulna. The embrj^onic cartilaginous fibula extends the entire length of the leg, but does not articulate with the femur. The distal part of the shaft is usually reduced to a fibrous band. Three centers of ossification appear, one each for the shaft and the extremities. The distal end unites early with the tibia, forming the lateral malleolus. It is interesting to note that in some cases the entire shaft of the fibula develops, a reversion to the condition in the IMiocene ancestors of the horse. THE PATELLA The patella is a large sesamoid bone which articulates with the trochlea of the femur. It presents for description two surfaces, two borders, a base, and an apex. The anterior, free surface (Facies libera) is quadrilateral, convex, and rough for muscular and ligamentous attachment. The articular surface (Facies articularis) is also quadrilateral, but much less extensive. It presents a vertical rounded ridge, which corresponds to the groove. .1 pi'X Fig. 100.—Right Patella of Horse; Anterior View. 1, Attachnient area of middle patellar ligament; 2, attachment area of lateral patellar ligament and biceps Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sisson, Septimus, 1865-1924. Philadelphia ; London : W. B. Saunders Company
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