Joints and Ligaments of Shoulder Girdle

Sternoclavicular synovial joint

saddle

Acromioclavicular synovial joint

plane or gliding

Glenohumeral synovial joint

ball and socket

Scapulothoracic synovial joint

pseudo-joint necessary for full glenohumeral function

Coracoclavicular Attachments

1. Trapezoid

attachments- from coracoid process to trapezoid line of clavicle

 2. Conoid

attachments- from coracoid process to conoid tubercle of clavicle

adjacent acromion

Coracoclavicular Function

stabilizes acromioclavicular joint limiting medial displacement, protraction & elevation

Coracoacromial Function

prevents the superior displacement of the humeral head by forming the coracoacromial arch

Coracoacromial Attachments

from lateral border of coracoid process to acromion adjacent to clavicular articulation

Coracohumeral Function

reinforces superoanterior aspects of joint capsule

Coracohumeral Attachments

from base of coracoid process to anterior aspect greater tubercle

Acromioclavicular Function

stabilizes acromioclavicular joint

Acromioclavicular Attachments

from superior aspect of acromial end of the clavicle to adjacent acromion

Costoclavicular Function

stabilizes sternoclavicular joint, limiting elevation of the clavicle

Costoclavicular Attachments

from superior aspect of cartilage of first rib to undersurface of the clavicle

Superior transverse scapular Function

closes off the suprascapular notch

Superior transverse scapular Attachments

from the base of the coracoid process to the medial edge of the scapular notch

Glenoid capsule Attachments

from the circumference of glenoid cavity to anatomical neck of the humerus

Glenohumeral (three ligg.; superior, middle, inferior) Function

stabilizes glenohumeral articulation

Glenohumeral (three ligg.; superior, middle, inferior) Attachments

from upper part of medial margin of glenoid cavity to lesser tubercle & anatomical neck