Joints of shoulder region

coracoacromial ligament attachment

lateral border of coracoid process and acromion of scapula

what is the function of the coracoacromial joint?

prevent superior dislocation of the humerus

acromioclavicular joint classification

synovial plane joint, multiaxial

AC joint articulates between 2 bones:

clavicle and scapula

function of AC joint

connects acromion to clavicle, pivot point for arm movement
stabilizer against ant/post translation of clavicle

actions of AC joint

protraction - retraction
elevation - depression
axial rotation

costoclavicular ligament attachment

medial end of clavicle to costal cartilage of first rib

costoclavicular ligament function

prevents superior dislocation of clavicle, limits protraction and retraction

sternoclavicular joint attachment

medial end of clavicle to manubrium of sternum

classify the sternoclavicular joint

synovial saddle joint, multiaxial

movements of the sternoclavicular joint

elevation - depression, protraction - retraction, and axial rotation

function of SC joint

allow movement of clavicle in multiple planes
pivot point for scapular movement
allows elevation, protraction and rotation of the shoulder girdle

coracoclavicular ligament is the stong extrinsic ligament of the

AC joint

coracoclavicular ligament has 2 parts attaching to the

acromial end of the clavicle

conoid part attachment

conoid tubercle, coracoid process

trapezoid part attachment

trapezoid line, coracoid process

function of coracoclavicular ligament

prevent superior dislocation of AC joint, prevent excessive rotation of scapula and clavicle

coracohumeral ligament attachment

coracoid process and greater/lesser tubercles of humerus

coracohumeral ligament function

limit excessive internal rotation and inferior translation of humerus