dermal bone
any of the the superficial bones in Teleostomi derived from the dermis and overlying the deeper elements of the skull. Primitive fishes have more dermal bones than higher ones, e.g. the armour of Ostracodermi. Dermal bones are a form of membrane bones, i.e. they arose directly from connective tissue membranes without the cartilaginous precursors which precede endochondral bones. They may be divided into laterosensory canal bones that develop in relation to the sensory canals, bones derived from mesenchymous tissue and anamestic bones (q.v.). Also called achondral, membrane, investing and covering bones

Dictionary of ichthyology. 2009.

Look at other dictionaries:

  • Dermal bone — A dermal bone (membrane bone) bony structures derived from intramembranous ossification that form components of the vertebrate skeleton including the skull, jaws, gills, fins and exoskeleton. In contrast to endochondral bone, dermal bone does not …   Wikipedia

  • dermal bone — noun Bone derived from intramembranous ossification, defining essential components of the vertebrate skeleton including the skull, jaws, gills, fins, and exoskeleton …   Wiktionary

  • dermal bone — a bone developed by ossification in the skin …   Medical dictionary

  • Bone — is the substance that forms the skeleton of the body. It is composed chiefly of calcium phosphate and calcium carbonate. It also serves as a storage area for calcium, playing a large role in calcium balance in the blood. The 206 bones in the body …   Medical dictionary

  • dermal basihyal — basihyal (the cartilage supporting the tongue at the anterior end of the hyal series in Elasmobranchii. It is the anteriormost median endochondral bone of the basibranchial series, joining both branches of the hyoid series and forming the tongue… …   Dictionary of ichthyology

  • dermal ossicle — noun : a small bone or concretion lying within the skin (as in various reptiles or the extinct ground sloths) …   Useful english dictionary

  • achondral bone — dermal bone (any of the superficial bones in Teleostomi derived from the dermis and overlying the deeper elements of the skull. Primitive fishes have more dermal bones than higher ones, e.g. the armour of Ostracodermi. Dermal bones are a form of… …   Dictionary of ichthyology

  • covering bone — dermal bone (any of the the superficial bones in Teleostomi derived from the dermis and overlying the deeper elements of the skull. Primitive fishes have more dermal bones than higher ones, e.g. the armour of Ostracodermi. Dermal bones are a form …   Dictionary of ichthyology

  • adnasal bone — a small dermal bone in front of the nasal bone in some fishes, e.g. the middle bone of three in the nasal region of Lepisosteus. Also called nasal bone …   Dictionary of ichthyology

  • Palpebral (bone) — The palpebral bone is a small dermal bone found in the region of the eye socket in a variety of animals, including crocodilians and ornithischian dinosaurs. In ornithischians, it can form a prong that projects from the front upper corner of the… …   Wikipedia

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