Atlanto-occipital joint: Difference between revisions
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== Description == | == Description == | ||
[[Image:Atlanto-occipital joint anterior.png|thumb|right|Atlanto-occipital joint (anterior)]]The atlanto-occipital articulations function as bilaterally symmetrical condyloid synovial joints. | [[Image:Atlanto-occipital joint anterior.png|thumb|right|Atlanto-occipital joint (anterior)]][[Image:Atlanto-occipital_joint_posterior.png|thumb|right|Atlanto-occipital joint (posterior)]]The atlanto-occipital articulations function as bilaterally symmetrical condyloid synovial joints. | ||
== Articulating Surfaces == | == Articulating Surfaces == | ||
Revision as of 16:02, 18 January 2014
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Description[edit | edit source]
The atlanto-occipital articulations function as bilaterally symmetrical condyloid synovial joints.
Articulating Surfaces[edit | edit source]
Occipital condyles and a superior articular facets of the atlas.
Ligaments & Joint Capsule
[edit | edit source]
The capsule is rather roomy and relaxed and the joint possesses no individual accessory ligaments:
- Two articular capsules
- Posterior atlanto-occipital ligament
- Anterior atlanto-occipital ligament
Muscles[edit | edit source]
Motions Available[edit | edit source]
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.
Closed Packed Position[edit | edit source]
Open Packed Position[edit | edit source]
Other Important Information[edit | edit source]
Resources[edit | edit source]
Recent Related Research (from Pubmed)[edit | edit source]
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References[edit | edit source]
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