Zona orbicularis
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| Zona orbicularis | |
|---|---|
Capsule of hip-joint (distended). Posterior aspect. (Zona orbicularis labeled at center bottom.)
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| Details | |
| Latin | zona orbicularis articulationis coxae |
| Identifiers | |
| Dorlands /Elsevier |
z_01/12869758 |
| TA | Lua error in Module:Wikidata at line 744: attempt to index field 'wikibase' (a nil value). |
| TH | {{#property:P1694}} |
| TE | {{#property:P1693}} |
| FMA | {{#property:P1402}} |
| Anatomical terminology
[[[d:Lua error in Module:Wikidata at line 863: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]]
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The zona orbicularis or annular ligament is a ligament on the neck of the femur formed by the circular fibers of the articular capsule of the hip joint. It is also known as the orbicular zone, ring ligament, and zonular band.[1]
Structure
The articular capsule is much thicker above and in front of the joint, where the greatest amount of resistance is required, and thin and loose behind and below the joint. The capsule consists of two sets of fibers, circular and longitudinal. The circular fibers, the zona orbicularis, are most abundant at the lower and back part of the capsule where they form a sling or collar around the femoral neck. Anteriorly they blend with the deep surface of the iliofemoral ligament, and gain an attachment to the anterior inferior iliac spine. [2]
Function
The zona orbicularis and proximal hip joint capsule are poorly understood, but recent studies seem to confirm that the proximal to middle part of the articular capsule, including the zona orbicularis, acts biomechanically as a locking ring wrapped around the femoral neck and thus is a key structure for hip stability in distraction. [3]
Additional images
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Front view of hip joint with capsular ligament largely removed
Notes
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
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