Axial Skeleton


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Related to Axial Skeleton: appendicular skeleton

axial skeleton

[′ak·sē·əl ′skel·i·tən]
(anatomy)
The bones composing the skull, vertebral column, and associated structures of the vertebrate body.

Axial Skeleton

 

the section of the skeleton in chordates and man that is located along the longitudinal axis of the body. The axial skeleton provides the principal support for the body and protects the central nervous system.

In acraniates, the axial skeleton is represented by the notochord, whose supportive function is conditioned by the elasticity and the toughness of the outer membranes. In certain craniate vertebrates, the vertebral elements develop from the skeletogenic tissue that surrounds the notochord and the neural tube, with the notochord persisting throughout the organism’s life. The analogous skeletogenic tissue in cyclostomes gives rise to the neural arches of the vertebrae. In certain fishes—holocephalids, Acipenseridae, and dipnoans—the skelatogenic tissue develops into the vertebral centra, as well as into the neural arches.

In most vertebrates and in man, the axial skeleton takes the form of a notochord only in the early stages of embryonic development; the notochord is later supplanted by the developing bodies of the vertebrae. The prolongation of the trunk’s axial skeleton is called the axial cranium, or the neurocranium, or the cerebrocranium, and protects the brain and the organs of olfaction, sight, and hearing.

References in periodicals archive ?
of Bone or Swelling or range of Location of lesion lesions joint pain effusion motion Bone lesions (b) Axial skeleton (c) 22 (41) 15 (68) 7 (32) 0 (0) Long bones 19 (35) 16 (84) 14 (74) 2 (11) Lower extremity (d) 15 (28) 12 (80) 10 (67) 2 (13) Upper extremity (e) 4 (7) 4 (100) 4 (100) 0 (0) Small bones 12 (22) 10 (83) 10 (83) 2 (17) Feet (d) 8 (15) 7 (88) 8 (100) 1 (13) Hands (e) 4 (7) 3 (75) 2 (50) 1 (25) Patella (d) 1 (2) 1 (100) 1 (100) 1 (100) Total (bone lesions) (b) 54 (100) 42 (78) 32 (59) 5 (9) Joint lesions Knee 6 (50) 2 (33) 4 (67) 2 (33) Elbow 4 (33) 4 (100) 4 (100) 3 (75) Ankle 1 (8) 1 (100) 1 (100) 0 (0) Tarsometatarsal 1 (8) 1 (100) 0 (0) 0 (0) Total (joint lesions) 12 (100) 8 (67) 9 (75) 5 (42) No.
The patients who developed axial skeleton pain may be "on the path" to developing widespread pain.
Written by contributors based in the UK and the US, 129 focused chapters are logically arranged in sections on diagnosis, the foot, the forelimb, the hindlimb, the axial skeleton, developmental orthopedic disease, arthritis, soft tissues, therapeutics, the sports horse, and nonracing sports horses.
Later chapters cover injuries of the axial skeleton, appendicular skeleton and viscera, differential diagnosis, and dating of fractures.
The survey consists of anteroposterior (AP) radiographs of bilateral arms, forearms, hands, thighs, lower legs, and feet, as well as AP and lateral radiographs of the axial skeleton and skull.
AS is a chronic disease of the axial skeleton and large peripheral joints that causes inflammatory back pain and stiffness, but is also associated with other inflammatory diseases of the skin, eyes and intestines.
Tumor locations included lesions in the appendicular and axial skeleton.
About 350,000 people in the United States have been diagnosed with AS, a chronic, inflammatory rheumatologic disease primarily affecting the sacroiliac joints and axial skeleton.