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The navicular and the cuboid unite, and the distal end of the fibula is ankylosed with the tibia. In Cainotherium and Dichobune the upper incisors are fully developed. There are seven grinders; the teeth form a continuous series without a diastema. The metatarsals, the navicular and cuboid, and the distal end of the fibula, remain free.
The contrast between the grossly enlarged and misshapen tibia and the normal or even attenuated fibula is a striking one. Treatment is carried out on lines similar to those recommended in the acquired disease. When curving of the tibia causes disability in walking, the bone may be straightened by a cuneiform resection. Syphilitic dactylitis is met with chiefly in children.
Beach speaks of an individual who suffered fracture of both thighs, and compound comminuted fracture of the tibia, fibula, and tarsal bones into the ankle-joint, necessitating amputation of the leg. The patient not only survived the operation, but recovered with good union in both thighs.
The femur is more like that of the Palaeotheria than that of the horse, and has only a small depression above its outer condyle in the place of the great fossa which is so obvious in the Equidae. The fibula is distinct, but very slender, and its distal end is ankylosed with the tibia. There are three toes on the hind foot having similar proportions to those on the fore foot.
The navicular and the cuboid unite, and the distal end of the fibula is ankylosed with the tibia. In Cainotherium and Dichobune the upper incisors are fully developed. There are seven grinders; the teeth form a continuous series without a diastema. The metatarsals, the navicular and cuboid, and the distal end of the fibula, remain free.
The least modified mammals, in fact, have the radius and ulna, the tibia and fibula, distinct and separate. They have five distinct and complete digits on each foot, and no one of these digits is very much larger than the rest.
Well, then, you can bring me number three, the jaw." And with wonderful dexterity, never changing his position, he cut through the muscles clean down to the bone with a single motion of his wrist. He laid bare the tibia and fibula, introduced between them an implement to keep them in position, drew the saw across them once, and they were sundered.
I have now enumerated those characteristic structures of the horse which are of most importance for the purpose we have in view. The least modified mammals, in fact, have the radius and ulna, the tibia and fibula, distinct and separate. They have five distinct and complete digits on each foot, and no one of these digits is very much larger than the rest.
In the bird, the fibula is small and its lower end diminishes to a point. The tibia has a strong crest at its upper end and its lower extremity passes into a broad pulley. There seem at first to be no tarsal bones; and only one bone, divided at the end into three heads for the three toes which are attached to it, appears in the place of the metatarsus.
But the most important discovery of all is the Orohippus, which comes from the Eocene formation, and is the oldest member of the equine series, as yet known. Here we find four complete toes on the front-limb, three toes on the hind-limb, a well-developed ulna, a well-developed fibula, and short-crowned grinders of simple pattern.
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