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Placoid scale lateral cut Illustration and Icon
Placoid scale lateral cut
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A schematic cross-section of a placoid scale (dermal denticle) shows a posteriorly directed spine projecting through the epidermis and a basal plate seated in the dermis. An outer enameloid cap overlies dentine that surrounds a central pulp cavity. This anatomical structure is part of the integumentary system of cartilaginous fishes (class Chondrichthyes). In histology and comparative anatomy, placoid scales protect the skin and reduce hydrodynamic drag during locomotion.
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