parasphenoid definition

  • noun:
    • A bone situated straight away beneath the sphenoid when you look at the root of the head in many vertebrates.
    • an extended azygous dagger-shaped membrane-bone extending in midline lengthwise under the root of the head in Sauropsida, along the course of the sphenoid bone right. It forms area of the so-called rostrum or beak of the head.
    • A median unpaired bone tissue underlying the skull of amphibians and fishes, articulating aided by the vomer right in front sufficient reason for a number of bones behind.
    • This does not seem to be equivalent bone tissue as that similar title into the higher vertebrates, and it has already been ho-mologized by some writers with all the true vomer of the latter. See def. 1, and cuts under Lepidosiren and Anura.
  • adjective:
    • Near the sphenoid bone tissue; -- used especially to a bone situated immediately beneath the sphenoid within the foot of the skull in several creatures.
  • others:
    • Lying under or alongside the sphenoid; of or pertaining to the parasphenoid, in a choice of sense; parasphonoidal.

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