. Elements of zoölogy : a textbook. Zoology. STKUCTUKE OF THE SKULL. 55 the Mammals are the only animals that have teeth im- planted by two or more roots or fangs. The teeth are not regarded as a part of the true skeleton, being developments from the mucous membrane, which is FIG. 62. an. Skull of a Dog; longitudinal and vertical section, with the right half of the mandible or lower jaw and byoid arch—the lower jaw displaced downwards to show its whole form. Reduced in size. an, anterior narial aperture; MT, maxillo-turbinal bone; ET, ethmo-turbinal; Na, nasal; ME, ossified portion of the mese
. Elements of zoölogy : a textbook. Zoology. STKUCTUKE OF THE SKULL. 55 the Mammals are the only animals that have teeth im- planted by two or more roots or fangs. The teeth are not regarded as a part of the true skeleton, being developments from the mucous membrane, which is FIG. 62. an. Skull of a Dog; longitudinal and vertical section, with the right half of the mandible or lower jaw and byoid arch—the lower jaw displaced downwards to show its whole form. Reduced in size. an, anterior narial aperture; MT, maxillo-turbinal bone; ET, ethmo-turbinal; Na, nasal; ME, ossified portion of the mesethmoid; CE, cribriform plate of the ethmo- turbinal; Fr, frontal; Pa, parietal; IP, interparietal; SO, supraoccipital; ExO, exoc- cipital; BO, basioccipital; Per, periotic; BS, basisphenoid; Ft, pterygoid; AS, ali- sphenoid; OS, orbitosphenoid; PS, presphenoid; P/, palatine; Vo, vomer; Mz, max- illa; PM>, premaxilla; (s/i, stylohyal; eh, epihyal; ck, ceratohyal; 6ft, basihyal ; tk, thyrohyal; ) = the right half of the hyoidean apparatus; s, symphysis of the mandible; cp, coronoid process; cd, condyle; a, angle; id, inferior dental canal; *, the part of the cranium to which the condyle is articulated. fundamentally the same as the external integument of the body, and continuous with it. The teeth of the Mammals are confined to the lower jaw and to the premaxillary and maxillary bones above (Figs. 61, 62, 63). Some kinds of. 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 Tenney, Sanborn, 1827-1877. New York : Scribner
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