chordacentrum


chordacentrum
the vertebral centrum formed by the conversion of the chordal sheath into a series of ring-like cartilaginous segments around the notochord and subsequently biconcave discs. The bases of the neural and haemal arches abut the chordacentrum. Found only in Elasmobranchii

Dictionary of ichthyology. 2009.

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  • chordacentrum — chor·da·centrum …   English syllables

  • chordacentrum — |kȯrdə+ noun Etymology: New Latin, from chorda (anat.) + centrum : a centrum of a vertebra formed by segmentation of the cartilaginous or calcified sheath of the notochord (as in elasmobranchs) compare arcocentrum …   Useful english dictionary

  • asterospondylous vertebra — a type of vertebra with radiating, star like calcifications extending to the chordacentrum and autocentrum, e.g. in some Elasmobranchii …   Dictionary of ichthyology

  • cyclospondylous — referring to vertebra consisting of calcified rings around the notochord in Elasmobranchii and Holocephali. The calcification extends only to the chordacentrum or notochordal sheath, the arches are cartilaginous …   Dictionary of ichthyology

  • tectospondylous — a type of vertebral centra (and arches) with several concentric ossifications instead of just one, extending to the chordacentrum, arcocentrum and autocentrum. Found in skates and rays …   Dictionary of ichthyology

  • vertebra — (plural vertebrae)) bony or cartilaginous elements surrounding the notochord or replacing it and often protecting the spinal cord and caudal vein. Vertebrae are composed of a centrum formed from two pleurocentra and two intercentra or parts of… …   Dictionary of ichthyology

  • vertebra asterospondyla — (plural vertebrae asterospondylae)) asterospondylous vertebra (a type of vertebra with radiating, star like calcifications extending to the chordacentrum and autocentrum, e.g. in some Elasmobranchii) …   Dictionary of ichthyology

  • vertebra cyclospondyla — (plural vertebrae cyclospondylae)) cyclospondylous vertebra (vertebra consisting of calcified rings around the notochord in Elasmobranchii and Holocephali. The calcification extends only to the chordacentrum or notochordal sheath, the arches are… …   Dictionary of ichthyology

  • vertebra tectospondyla — (plural vertebrae tectospondylae)) tectospondylous vertebra (vertebral centra (and arches) with several concentric ossifications instead of just one, extending to the chordacentrum, arcocentrum and autocentrum. Found in skates and rays) …   Dictionary of ichthyology

  • arcocentrum — |ärkō|sen.trəm noun Etymology: New Latin, from arco (from Latin arcus bow) + centrum : a centrum of a vertebra formed of basal parts or segments of the neural and hemal arches more or less modified and fused together compare chordacentrum …   Useful english dictionary


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