Epidermal Tooth

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Epidermal Tooth

(also horny tooth). (1) A conical horny cutaneous formation in some vertebrates that fulfills the functions of a true tooth. Epidermal teeth are found in cyclostomes (on the walls of the buccal funnel and on the tongue), the larvae of tailless amphibians (on the lips), and many cyprinoid fishes (on the anterior half of the jaws). The epidermal teeth of cyprinoid fishes replaced true teeth in the process of historical development. The epidermal teeth of lampreys and amphibians apparently are also of secondary origin.

(2) A horny formation of cornified epidermis characteristic of the embryo of some reptiles (tuatara, turtles, crocodilians) and birds. The epidermal tooth, which is located on the upper or lower jaw, is used for piercing the shell of the egg. Hence, it performs the same function as the egg tooth of lizards and snakes.

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No references found			epicyst Epidaurian Organic Statute of 1822 Epidaurus Epidaurus Festival Epidemic epidemic diarrhea of the newborn epidemic encephalitis Epidemic Focus epidemic gastroenteritis epidemic hepatitis epidemic jaundice epidemic keratoconjunctivitis epidemic neuromyasthenia epidemic pleurodynia epidemic roseola Epidemic Typhus epidemic vegetative neuritis Epidemic viral gastroenteritis epidemiological study Epidemiological Survey Epidemiology Epidemiology, Military epidermal growth factor epidermal ridge Epidermal Ridges Epidermal Tooth Epidermis epidermoid carcinoma epidermoid cyst epidermolysis epidermolysis bullosa Epidermophytosis Epidiascope epididymis Epididymitis epidiorite epidosite Epidote epidote-amphibolite facies epidotization epidural epieugeosyncline Epifan Epifan Iovich Kovtiukh Epifan Kovtiukh Epifanii Epifanii Premudryi Epifanii Slavinetskii epifauna epigaster epigastric region			epidermal laminae epidermal limbi epidermal limbi Epidermal Lymphocyte Chemotactic Factor epidermal multinucleated giant cell epidermal multinucleated giant cell epidermal necrolysis epidermal necrolysis Epidermal necrolysis, toxic Epidermal necrolysis, toxic Epidermal Nerve Fiber Density epidermal nevus epidermal nevus epidermal nevus epidermal nibbles epidermal nibbles epidermal papilla epidermal papilla epidermal pegs epidermal pegs epidermal renewal time epidermal renewal time epidermal ridge epidermal ridge epidermal ridge Epidermal Ridges epidermal slough epidermal slough epidermal slough Epidermal Thymocyte Activating Factor Epidermal Tooth Epidermal-derived growth factor Epidermal-derived growth factor Epidermal-Dermal Junction epidermal-melanin unit epidermal-melanin unit epidermalization Epidermatic Epidermatoid Epidermeous epidermic epidermic epidermic Epidermic administration of medicine epidermic graft epidermic graft epidermic graft epidermic graft epidermic graft epidermic p epidermic p epidermic p epidermic p's epidermic p's epidermic p's epidermic pearls epidermic pearls epidermic pearls Epidermical Epidermidal epidermidalization

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