Atlanto-occipital joint

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Atlanto-occipital joint
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Anterior atlantoöccipital membrane and atlantoaxial ligament.
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Posterior atlantoöccipital membrane and atlantoaxial ligament.
Latin Articulatio atlantooccipitalis
Gray's p.295
MeSH Atlanto-Occipital+Joint

The atlanto-occipital joint (articulation between the atlas and the occipital bone) consists of a pair of condyloid joints. The atlanto-occipital joint is a synovial joint.

Ligaments[edit]

The ligaments connecting the bones are:

Motions[edit]

The movements permitted in this joint are:

  • (a) flexion and extension around the mediolateral axis, which give rise to the ordinary forward and backward nodding of the head.
  • (b) slight lateral motion, lateroflexion, to one or other side around the anteroposterior axis.

Flexion is produced mainly by the action of the longi capitis and recti capitis anteriores; extension by the recti capitis posteriores major and minor, the obliquus capitis superior, the semispinalis capitis, splenius capitis, sternocleidomastoideus, and upper fibers of the trapezius.

The recti laterales are concerned in the lateral movement, assisted by the trapezius, splenius capitis, semispinalis capitis, and the sternocleidomastoideus of the same side, all acting together.

Tension-like headaches[edit]

The atlanto-occipital joint features predominantly in the symptom of tension-like headaches as a result of prolonged inappropriate posture from poor ergonomic adaptation.[citation needed]

In such cases, patients typically report cracking of the neck, discomfort when sitting, continuous migraine-like headaches, dullness, dizziness, tingling in the fingers, sensitivity to light and a feeling the head is expanding.[citation needed]

Additional images[edit]

References[edit]

This article incorporates text from a public domain edition of Gray's Anatomy.