Shoulder Joint

Question 1

Anterior Deltoid

Answer 1

O:lateral third of the clavicle
I: deltoid tuberosity
A: shoulder ABD, flexion, IR, and horizontal ADD
N: Axillary n. C5, C6

Question 2

Middle Deltoid

Answer 2

O: Acromion process
I: Deltoid tuberosity
A: shoulder ABD
N: Axillary n. C5, C6

Question 3

Posterior Deltoid

Answer 3

O: spine of scapula
I: Deltoid tuberosity
A: shoulder ABD, extension, hyperextension, ER, horizontal ABD
N: Axillary n. C5, C6

Question 4

Pectoralis Major (clavicular portion)

Answer 4

O: medial third of clavicle
I: lateral lip of bicipital groove of humerus
A: shoulder flexion —first 60°
N: lateral and medial pectoral n. C5-T1

Question 5

Pectoralis Major (sternal portion)

Answer 5

O: sternum, costal cartilage of first six ribs
I: lateral lip of the bicipital groove humerus
A: shoulder extension —first 60° (180-120°)
N: lateral and medial pectoral n. C5-T1

Question 6

Pectoralis major (combined)

Answer 6

O:Medial third of clavicle, sternum, and costal cartilage of ribs 1 to 6
I: lateral lip of the bicipital groove of humerus
A: shoulder ADD, IR, horizontal ADD
N: lateral and medial pectoral n. C5-T1

Question 7

Latissimus Dorsi

Answer 7

O: spinous process of T7 through L5 (via thoracolumbar fascia), posterior surface of sacrum, iliac crest, and lower three ribs
I: medial floor of bicipital groove of humerus
A: shoulder extension, ADD, IR, hyperextension
N: thoracodorsal n. C6-C8

Question 8

Teres Major

Answer 8

O: inferior axillary border of scapula near the inferior angle
I: medial lip of bicipital groove on the anterior surface of the humerus
A: shoulder extension, ADD, IR
N: lower subscapular n. C5-C7

Question 9

Supraspinatus

Answer 9

O: supraspinous fossa of the scapula
I: greater tubercle of the humerus
A: shoulder ABD
N: suprascapular n. C5, C6

Question 10

Infraspinatus

Answer 10

O: infraspinous fossa of scapula
I: greater tubercle of humerus
A: shoulder ER, horizontal ABD
N: suprascapular n. C5, C6

Question 11

Teres minor

Answer 11

O: Axillary border of scapula
I: greater tubercle of humerus
A: shoulder lateral rotation, horizontal ABD
N: axillary n. C5, C6

Question 12

Subscapularis

Answer 12

O: subscapular fossa of the scapula
I: lesser tubercle of the humerus
A: shoulder IR
N: upper and lower subscapular n. C5, C6

Question 13

Coracobrachialis

Answer 13

O: coracoid process of the scapula
I: medial surface of the humerus near the midpoint
A: stabilizes the shoulder joint
N: musculocutaneous n. C5-C7