Axial Skeleton

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Related to Axial Skeleton: appendicular skeleton

axial skeleton

[′ak·sē·əl ′skel·i·tən]
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.

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Individuals with psoriatic arthritis test negative for rheumatoid factor but they may have an association with HLA-B27, especially those with involvement of the axial skeleton.
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Development of axial skeleton and skeletal abnormalities of Atlantic halibut (Hippoglossus hippoglossus) from first feeding through metamorphosis.
The axial skeleton of avian species and mammals is very similar, so differences in the axial skeleton will be noted with each particular bone.
The two main divisions of the skeleton are the trunk, or axial skeleton, and the limbs, or appendicular skeleton (Figure 5-2).
The second section which covers the axial skeleton includes the vertebral column, the thorax and chest wall and the temperomandibular joint.
As noted above, the American College of Rheumatology criteria for fibromyalgia require that a person has had widespread pain above and below the waist, on both sides of the body, and in the axial skeleton, for at least three months, as well as pain on palpation of at least 11 of 18 specific tender point sites.
However, the study of more than 8,000 people did suggest that such collisions may be associated with a post-crash onset of axial skeleton pain, John McBeth, Ph.
But the study of more than 8,000 people did suggest that such collisions may be associated with a postcrash onset of axial skeleton pain, John McBeth, Ph.