scapulohumeral muscles OIA

Question 1

supraspinatus

Answer 1

O: supraspinous fossa
I: superior facet of greater tubercle of humerus
A: scaption (abduction and flexion of arm @ GH joint)

Question 2

infraspinatus

Answer 2

O: infraspinous fossa
I: middle facet of greater tubercle of humerus
A: lateral rotation of arm @ GH joint, weak horizontal extension of arm @ GH

Question 3

teres minor

Answer 3

O: superior lateral border of scapula
I: inferior facet of greater tubercle of humerus
A: lateral rotation of arm @ GH joint, weak horizontal extension of arm @ GH

Question 4

subscapularis

Answer 4

O: subscapular fossa
I: lesser tubercle of humerus
A: medial rotation of arm @ GH

Question 5

teres major

Answer 5

O: inferior angle and inferior lateral border of scapula
I: crest of lesser tubercle of humerus
A: medial rotation, adduction and extension of arm @ GH joint

Question 6

coracobrachialis

Answer 6

O: coracoid process
I: medial shaft of humerus (middle 1/3)
A: flexion, adduction of arm @ GH, weak horizontal flexion of arm @ GH

Question 7

deltoid

Answer 7

O: lateral 1/3 of scapula, acromion process, spine of scapula
I: deltoid tuberosity
A: flexion, extension, abduction, horizontal flexion, horizontal extension, lateral/medial rotation of arm @ GH joint

Question 8

biceps brachii

Answer 8

O: long head - supraglenoid tubercle. short head - coracoid process
I: radial tuberosity
A: flexion of forearm @ elbow and arm @ GH. supination of forearm @ RU joint.

Question 9

triceps brachii

Answer 9

O: long head - infraglenoid tubercle, lateral head - proximal 1/3 of posterior shaft of humerus, deep head - distal 2/3 of posterior shaft of humerus
I: olecranon process
A: extension of forearm @ elbow joint, extension of arm @ GH joint