. On the anatomy of vertebrates [electronic resource] . Portion of transverse section of tooth of Labyrinthodon,magn. The general form of the matrix or forma- Tootb. of a Dendrodus, naturalsize. v. tive organ of teeth, and the relative position of the dentinal pulpto its product, bear a close resemblance to the formative organof hair and bristle. In these, however, the papilla or pulp isdeveloped from the skin, in teeth from the mucous membrane. Teeth further agree with the extravascular appendages of theskin in being shed and reproduced, sometimes once, sometimesfrequently, during the lif
. On the anatomy of vertebrates [electronic resource] . Portion of transverse section of tooth of Labyrinthodon,magn. The general form of the matrix or forma- Tootb. of a Dendrodus, naturalsize. v. tive organ of teeth, and the relative position of the dentinal pulpto its product, bear a close resemblance to the formative organof hair and bristle. In these, however, the papilla or pulp isdeveloped from the skin, in teeth from the mucous membrane. Teeth further agree with the extravascular appendages of theskin in being shed and reproduced, sometimes once, sometimesfrequently, during the lifetime of the individual. In some 368 ANATOMY OF VERTEBRATES. instances, as with certain dermal appendages, the reproduction ofthe tooth is uninterrupted, or continuous. A tooth, when fullyformed, is subject to decay, but has no inherent power ofreparation. 246
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Keywords: ., bookcentury1800, booksubject, booksubjectbirds, booksubjectfishes
