Q30 Glenohumeral Joint

Question 1

State the type of joint

Answer 1

Multi axial synovial ball and socket joint

Question 2

Briefly describe the articular surface of the head of humerus

Answer 2

The head of the humerus is 2/5 of a sphere, faces superiorly medially and posteriorly, covered with hyaline cartilage which is thicker centrally and thinner at the periphery.

Question 3

State the attachment of the capsule

Answer 3

Medially: attached to the circumference of the glenoid fossa, beyond the labrum and including the supra-glenoid tubercle. Laterally: attached to the anatomical neck of the humerus, inferiorly to the shaft of humerus

Question 4

Name the muscles that produce flexion of the choulder joint

Answer 4

Anterior fibres of deltoid, clavicular head of Pectoralis Major Coracobrachialis, Biceps Brachii (long head)

Question 5

Name 2 muscles that produce Abduction of the shoulder joint

Answer 5

Supraspinatus (initiates first 20degs) middle fibres of deltoid