. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. p I 616 COMPARATIVE PHYSIOLOGY. in which the toes end, are not only weapons of offense and de- fense, but protective against injury from contact with bard sur- faces, as well as directly helpful in locomotion. These princ pies are admirably exemplified in the foot of solipeds. The foot of the horse may be udd to consist of terminal bones incased in soft structures adapted to shie
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. p I 616 COMPARATIVE PHYSIOLOGY. in which the toes end, are not only weapons of offense and de- fense, but protective against injury from contact with bard sur- faces, as well as directly helpful in locomotion. These princ pies are admirably exemplified in the foot of solipeds. The foot of the horse may be udd to consist of terminal bones incased in soft structures adapted to shield the animal from the effects of excessive ooncussiou aad for nutrition, the. Fm. 4M. Fio. 4S9.—Longltadinat median aectlon of foot. 1. •ntorior extensor of phalngMi, or extensor pedis; 8, lateral extensor, or extensor Bnftraginls; S^Miiroto of BMta- earpo-phato^geal articulation; 4. large meUrarpal bone; S. snperacial flexor or phaiangeii, or perforatus; 6, deep flexor, or nerforana; 7, sheath; 8, buna; B, SMa- moid iM^t mTergot and fatty cushion of fctlcck; 11. cmclal llmment; M, short semmold ligament; 18, flrst phalanx; 14, bursa; 15, swsond phdanx; 18, navlcu- fan-bone; IT. plantar cushion; 18, third ^u^x; 19, pUintar surface of hoof; SO, ieaaltlve or keratogenoos membrane of third nhalanx. „ >vi t _ -* Fro.«».—Horiaontal section of horse's foot. 1, front or toe of hoof; 2. Uilcknesa of wall; 8, Umims; 4. Insertion of extensor nedls; fcpe pedis; 8, navicular bone; 7, winos of OS pedis; 8, lateral cartihwc; », flexor pedis tendon; 10, planUr cushion; 11, inflexion of wall or *'bar"; 19,liamy frog. whole being incased in a protective covering whidh in a state of nature is constantly being worn away and renewed. He hoof is the homologue of the nails and claws of othermammals, and so may be regarded as a modification of the eindermis; and thus viewed, its structure is at once more readily under- stood and more interesting. To speak from an anato
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