Muscles of the Upper Limb

Question 1

Muscle of the Rotator Cuff

Answer 1

Suprasinatus

Infraspinatus

Teres Minor

Subscapularis

Question 2

Action of the Rotator Cuff

Answer 2

Rotates humerous

Stabilizes glenohumeral joint

Question 3

Supraspinatus

Answer 3

Origin: Supraspinus fossa

Insertion: greater tubercle of the humerous

Action: abduction (assists deltoid)

Question 4

Infraspinatus

Answer 4

Origin: Infraspinous fossa

Insertion: medial part of the greater tubercle

Action: laterally rotates arm

Question 5

Teres Minor

Answer 5

Origin: superior lateral border of the scapula

Insertion: inferior facet of the greater tubercle

Action: lateral rotation

Question 6

Subscapularis

Answer 6

Origin: subscapular fossa

Insertion: lesser tubercle of the humerus

Action: medial rotation, adduction

Question 7

Biceps Brachii

Answer 7

Proximal Attachment

Short head: coracoid process

Long head: supraglenoid tubercle

Distal Attachment: tuberosity of the radius and fascia of the forearm (aponeurosis)