Transverse Ligament of the Atlas: Difference between revisions
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== Description == | == Description == | ||
[[File:Transverse lig. of atlas.png|thumb|320x320px]] | |||
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The transverse ligament of the atlas is a thick, strong band, which arches across the ring of the atlas, and retains the odontoid process in contact with the anterior arch. It is concave in front, convex behind, broader and thicker in the middle than at the ends. The anterior surface of the ligament is covered with articular cartilage to allow articulation with the Odontoid process. | The transverse ligament of the atlas is a thick, strong band, which arches across the ring of the atlas, and retains the odontoid process in contact with the anterior arch. It is concave in front, convex behind, broader and thicker in the middle than at the ends. The anterior surface of the ligament is covered with articular cartilage to allow articulation with the Odontoid process. | ||
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It is attached on either side to a small tubercle on the medial surface of the lateral mass of the [[Atlas]]. | It is attached on either side to a small tubercle on the medial surface of the lateral mass of the [[Atlas]]. | ||
[[File:Tectorial membrane.png|thumb|280x280px|Tectorial membrane]] | |||
As it crosses the odontoid process, a small fasciculus (crus superius) is prolonged upward, and another (crus inferius) downward, from the superficial or posterior fibers of the ligament. The former is attached to the basilar part of the occipital bone, in close relation with the [[Tectorial membrane]]; the latter is fixed to the posterior surface of the body of the [[Axis]]; hence, the whole ligament is named the '''cruciform ligament''' of the atlas. | As it crosses the odontoid process, a small fasciculus (crus superius) is prolonged upward, and another (crus inferius) downward, from the superficial or posterior fibers of the ligament. The former is attached to the basilar part of the occipital bone, in close relation with the [[Tectorial membrane]]; the latter is fixed to the posterior surface of the body of the [[Axis]]; hence, the whole ligament is named the '''cruciform ligament''' of the atlas. | ||
== Function == | == Function == | ||
It divides the ring of the [[Atlas]] into two unequal parts: of these, the posterior and larger serves for the transmission of the spinal cord, its membranes and the accessory nerves; the anterior and smaller contains the [[Odontoid process]]. | It divides the ring of the [[Atlas]] into two unequal parts: of these, the posterior and larger serves for the transmission of the spinal cord, its membranes, and the accessory nerves; the anterior and smaller contains the [[Odontoid process]]. | ||
It functions to prevent anterior displacement of the C1 (atlas) over C2 (axis). | It functions to prevent anterior displacement of the C1 (atlas) over C2 (axis). | ||
It is the main stabilizer for the odontoid process. | It is the main stabilizer for the odontoid process preventing it from posterior migration. | ||
== Pathology == | == Pathology == | ||
Revision as of 00:14, 7 December 2020
Original Editor - Rachael Lowe
Top Contributors - Khloud Shreif, Rachael Lowe, Kim Jackson, Evan Thomas, Claire Knott, Tarina van der Stockt and WikiSysop
Description[edit | edit source]
The transverse ligament of the atlas is a thick, strong band, which arches across the ring of the atlas, and retains the odontoid process in contact with the anterior arch. It is concave in front, convex behind, broader and thicker in the middle than at the ends. The anterior surface of the ligament is covered with articular cartilage to allow articulation with the Odontoid process.
Attachments[edit | edit source]
It is attached on either side to a small tubercle on the medial surface of the lateral mass of the Atlas.
As it crosses the odontoid process, a small fasciculus (crus superius) is prolonged upward, and another (crus inferius) downward, from the superficial or posterior fibers of the ligament. The former is attached to the basilar part of the occipital bone, in close relation with the Tectorial membrane; the latter is fixed to the posterior surface of the body of the Axis; hence, the whole ligament is named the cruciform ligament of the atlas.
Function[edit | edit source]
It divides the ring of the Atlas into two unequal parts: of these, the posterior and larger serves for the transmission of the spinal cord, its membranes, and the accessory nerves; the anterior and smaller contains the Odontoid process.
It functions to prevent anterior displacement of the C1 (atlas) over C2 (axis).
It is the main stabilizer for the odontoid process preventing it from posterior migration.
Pathology[edit | edit source]
Examination[edit | edit source]
References[edit | edit source]
