The acromioclavicular joint, or AC joint, is a joint at the highest point of the shoulder. It is the intersection between the acromion (some portion of the scapula that shapes the most elevated purpose of the shoulder) and the clavicle. It is a plane synovial joint.
Tendons
The joint is settled by three tendons:
The acromioclavicular tendon, which connects the clavicle to the acromion of the scapula.
Predominant Acromioclavicular Ligament This tendon is a quadrilateral band, covering the unrivaled piece of the enunciation, and reaching out between the upper piece of the horizontal end of the clavicle and the connecting some portion of the upper surface of the acromion.
It is made out of parallel strands, which entwine with the aponeuroses of the Trapezius and Deltoideus; beneath, it is in contact with the articular circle when this is available.
Second rate Acromioclavicular Ligament This tendon is to some degree more slender than the first; it covers the under piece of the enunciation, and is appended to the connecting surfaces of the two bones.
It is in connection, above, in uncommon cases with the articular plate; underneath, with the ligament of the Supraspinatus
The coracoacromial tendon, which keeps running from the coracoid procedure to the acromion.
The Coracoacromial Ligament is a solid triangular band, stretching out between the coracoid procedure and the acromion.
It is appended, by its zenith, to the summit of the acromion just before the articular surface for the clavicle; and by its wide base to the entire length of the parallel outskirt of the coracoid procedure.
This tendon, together with the coracoid procedure and the acromion, frames a vault for the insurance of the leader of the humerus.
It is in connection, above, with the clavicle and under surface of the Deltoideus; underneath, with the ligament of the Supraspinatus, a bursa being intervened.
Its sidelong outskirt is persistent with a thick lamina that goes underneath the Deltoideus upon the ligaments of the Supraspinatus and Infraspinatus.
The tendon is now and again portrayed as comprising of two negligible groups and a more slender interceding segment, the two groups being appended individually to the pinnacle and the base of the coracoid procedure, and consolidating at the acromion.
At the point when the Pectoralis minor is embedded, as sometimes is the situation, into the container of the shoulder-joint rather than into the coracoid procedure, it goes between these two groups, and the mediating segment of the tendon is then lacking.
The coracoclavicular tendon, which comprises of two tendons, the conoid and the trapezoid tendons.
The Coracoclavicular Ligament serves to associate the clavicle with the coracoid procedure of the scapula.
It doesn't appropriately have a place with the acromioclavicular joint explanation, yet is normally depicted with it, since it shapes a most productive methods for holding the clavicle in contact with the acromion. It comprises of two fasciculi, called the trapezoid tendon and conoid tendon.
These tendons are in connection, in front, with the Subclavius and Deltoideus; behind, with the Trapezius.
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