Acromioclavicular Ligament

The acromioclavicular ligament is at the top of the shoulder; it is part of the acromioclavicular joint, which lies between the part of the scapula that makes up the highest point of the shoulder (the acromion) and the collarbone, or clavicle. The acromioclavicular ligament divided into two parts: the superior and the inferior.

The superior acromioclavicular ligament extends from the upper surface of the acromion to the outer end of the clavicle. It's a quadrilateral band made up of ...

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    Full Acromioclavicular Ligament Description

    [Continued from above] . . . parallel fibers, which are interlaced with the aponeuroses (or tendons) of the trapezius and deltoid muscles. If the articular disk is present, then the bottom edge of the superior acromioclavicular ligament is attached there. This ligament gives the acromioclavicular joint its horizontal stability.

    The inferior acromioclavicular ligament is thinner than the superior; it covers the lower part of the joint, and is attached to the two bones along their adjoining surfaces. If the articular disk is present, then the top edge of this ligament connects to the disk; its lower edge is in relation with the tendon of the supraspinatus muscle (a small muscle of the upper arm).