Annals of medical history . FiO. 9. Two views of the mandible of a three-toed horse, MerycbippuS campestris, from the Miocene, aboutone and one-half million yean old. The figures show in the absorbed alveolar margins pathological processessimilar to alveolar pyorrhea of the present day. A left premolar shows evidences of caries, and the swelling inthe left ramus, so evident in the right-hand figure, is indicative of a fistula, possibly indicating the presence ofactinomycosis in the early stages. (Courtesy of Dr. . I). Mather I Studies in Paleopathology 385.

Annals of medical history . FiO. 9. Two views of the mandible of a three-toed horse, MerycbippuS campestris, from the Miocene, aboutone and one-half million yean old. The figures show in the absorbed alveolar margins pathological processessimilar to alveolar pyorrhea of the present day. A left premolar shows evidences of caries, and the swelling inthe left ramus, so evident in the right-hand figure, is indicative of a fistula, possibly indicating the presence ofactinomycosis in the early stages. (Courtesy of Dr. . I). Mather I Studies in Paleopathology 385. Stock Photo
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