Intrinsic Thoracic Limb Muscle Actions

Question 1

Deltoideus m.

Answer 1

Flex the shoulder jt.

Question 2

Infraspinatus m.

Answer 2

Extend or flex the shoulder joint depending on the position of the limb
Laterally stabilize and abduct the shoulder joint

Question 3

Teres minor m.

Answer 3

Flex the shoulder joint
Rotate the shoulder laterally
Prevent medial rotation when bearing weight

Question 4

Supraspinatus m.

Answer 4

Extend and stabilize the shoulder joint

Question 5

Subscapularis m.

Answer 5

Adduct, extend and medially stabilize the shoulder joint
Flex the shoulder joint (innervated by axillary n.)
Rotate the shoulder medially and prevent lateral rotation when bearing weight

Question 6

Teres major m.

Answer 6

Flex the shoulder jt.
Rotate the shoulder medially

Question 7

Coracobrachialis m.

Answer 7

Adduct, extend and stabilize the shoulder jt.

Question 8

Tensor fasciae antebrachii m.

Answer 8

Extend the elbow

Question 9

Triceps brachii m.

Answer 9

Long head - flex the shoulder joint and extend the elbow
Lateral, accessory, and medial heads - extend the elbow

Question 10

Anconeus m.

Answer 10

Extend the elbow

Question 11

Biceps brachii m.

Answer 11

Extend the shoulder joint
Flex the elbow

Question 12

Brachialis m.

Answer 12

Flex the elbow