An anterior view of the shoulder girdle showing three ligaments: acromioclavicular lig., coracoclavicular lig., and coracoacromial lig.
Acromioclavicular lig.: ‘Stabilizes the joint between to clavicle and the acromion process of the scapula. Restrains posterior translation and displacement of the clavicle.’
Coracoclavicular lig.: ‘This ligament serves to connect the clavicle with the coracoid process of the scapula. Controls vertical stability; restrains superior and anterior displacement. It consists of two parts, called the trapezoid and conoid ligaments.’
Coracoacromial lig.: ‘Vestigal function related to fact that coracoid and acromion evolved as separate bones. Controls anterior and posterior translation of the lateral clavicle.’
- Info from http://www.nismat.org/orthocor/exam/shoulder.html