Knowra Dermal denticle Dermal denticle A small tooth-like structure embedded in the skin of cartilaginous fishes. Its mineralized outer layer and underlying tissues make it distinct from ordinary scales.
Placoid scale : A tooth-like skin structure characteristic of cartilaginous fishes, consisting of a base, pulp cavity, dentine, and enamel-like covering. This is the traditional anatomical name for a dermal denticle.
Shark skin : The skin of sharks, covered by overlapping mineralized denticles and supported by connective tissue. Denticles are the distinctive surface structures of shark skin.
Sharkskin effect : The drag-reducing influence of certain shark-skin textures on water flow. It describes a proposed performance benefit of aligned denticles.
Cartilaginous fish : A jawed vertebrate whose skeleton is primarily cartilage rather than bone, including sharks, rays, and chimaeras. Dermal denticles are characteristic of this vertebrate group.
Dentine : A mineralized tissue that forms much of the structure of teeth and some tooth-like skeletal elements. Dentine forms the hard inner body of many denticles.
Odontogenesis : The developmental process by which teeth form through interactions between epithelial and mesenchymal tissues. Denticle formation shares developmental features with tooth formation.
Riblet technology : Engineered surface grooves designed to reduce turbulent skin-friction drag. Riblet surfaces borrow a flow-control principle associated with denticle ridges.
Shark tooth : A continually replaced tooth of a shark, with a mineralized crown and a base attached to the jaw. Shark teeth and denticles share tooth-like tissues but occupy different body locations.
Enameloid : A highly mineralized, enamel-like tissue covering the crowns of many fish teeth and denticles. This outer tissue protects the exposed crown of a denticle.
Epithelial-mesenchymal transition : A cellular process in which epithelial cells acquire mesenchymal traits, affecting shape, movement, and tissue organization. Related tissue interactions help organize developing denticle-forming units.
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