Shoulder flexors

Question 1

Pectoralis major

Answer 1

O: Clavicular attachment - sternal half of anterior surface of clavicle.
sternocostal attachment - anterior surface of manubrium, body of sternum, upper six costal cartilages, sixth rib, aponeurosis of external oblique muscle

I: lateral lip of intertubercular sulcus of humerus

D

A: adducts, medially rotates, flexes and extends shoulder

N: medial and lateral pectoral nerve (C5-T1)

Question 2

Deltoid (anterior fibres)

Answer 2

O: anterior border of lateral third of clavicle

I: deltoid tuberosity of humerus

D:

A: flex and medially rotates shoulder

N: axillary nerve (C5, 6)

Question 3

Bicep brachii (long head)

Answer 3

O: supraglenoid tubercle of scapula and glenoid labrum

I: posterior part of radial tuberosity, bicipital aponeurosis into deep fascia over common flexor origin

D:

A: flexes shoulder and elbow, supinates forearm

N: musculocutaneous nerve (C5, 6)

Question 4

Coracobrachialis

Answer 4

O: apex of coracoid process

I: midway along medial border of humerus

D:

A: adducts shoulder and acts as a weak flexor

N: musculocutaneous nerve (C5, 7)