The acromioclavicular ligament is part of the acromioclavicular joint. It is divided into two parts: superior and inferior.
Superior acromioclavicular ligament
This ligament is a quadrilateral band, covering the superior part of the articulation, and extending between the upper part of the lateral end of the clavicle and the adjoining part of the upper surface of the acromion.
This ligament provides horizontal stability to the acromioclavicular joint
Inferior acromioclavicular ligament
This ligament is somewhat thinner than the preceding; it covers the under part of the articulation, and is attached to the adjoining surfaces of the two bones.
It is in relation, above, in rare cases with the articular disk; below, with the tendon of the supraspinatus.
- Anatomy figure: 10:02-01 at Human Anatomy Online, SUNY Downstate Medical Center
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