Pleurapophysis

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Pleurapophysis (Anat) One of the ventral processes of a vertebra, or the dorsal element in each half of a hemal arch, forming, or corresponding to, a vertebral rib.
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Century Dictionary and Cyclopedia
    • n pleurapophysis A lateral process of a vertebra, having the morphological character of a rib, or forming a true rib. Such processes in the thoracic region of the spine are commonly highly developed, and movably articulated both with the centra and with the diapophyses of the thoracic vertebræ, and they are then ribs in an ordinary sense. They are mostly rudimentary in other parts of the spinal column, but sometimes are very evident, as in the cervical ribs of various vertebrates, including man. In man, in the neck, they bound the vertebrarterial foramen in front, and produce the tubercles known as anterior on the transverse process. Pleurapophyses are also by some considered to be represented in the lateral mass of the human sacrum. Developed and movably articulated pleurapophyses, forming true ribs, often extend into th e sacral as well as cervical region, as in various birds; and in all of this class more or fewer of them bear accessory processes called uncinate. (See cut under epipleura.) In serpents they run in unbroken series from head to tail, and assist in locomotion. (See gastrostege.) In some reptiles they support a patagium (see cut under dragon); in the cobra they spread the hood. In Owen's nomenclature the term pleurapophysis is restricted to the true bony part of a rib, the gristly part or costal cartilage being called hemapophysis. See cuts under vertebra and endoskeleton.
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Chambers's Twentieth Century Dictionary
    • ns Pleurapophysis a lateral process of a vertebra, with the morphological character of a rib:—pl. Pleurapoph′yses
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Etymology

Webster's Revised Unabridged Dictionary
NL. See Pleura, and Apophysis
Chambers's Twentieth Century Dictionary
Gr., a rib.

Usage

In literature:

The scapula (with supra-scapula) is the pleurapophysis, the coracoid the haemapophysis, of the occipital vertebra.
"Form and Function" by E. S. (Edward Stuart) Russell
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