Chest and Arm

Question 1

Pectoralis major

Answer 1

Origin: Medial half of clavicle, sternum, costal cartilage 1-7

Insertion: lateral lip of intertubercular sulcus

Action: medially rotates, flexes, and adducts the humerus

Innervation: Medial and lateral pectoral nerve

Blood Supply: pectoral branch of thoracoacromial artery

Question 2

Pectoralis minor

Answer 2

Origin: Ribs 3-5

Insertion: Coracoid process of scapula

Action: anteriorly tilts and depresses the scapula

Innervation: medial pectoral nerve

Blood Supply: pectoral branch of thoracoacromial artery

Question 3

Biceps Brachii

Answer 3

Origin: supraglenoid tubercle of scapula and coracoid process of scapula

Insertion: radial tuberosity and antebrachial fascia

Action: supinates and flexes forearm

Innervation: musculocutaneous nerve

Blood Supply: brachial artery

Question 4

subclavius

Answer 4

Origin: Rib 1

Insertion: Clavicle

Action: Depresses clavicle, stabilizes sternoclavicular joint

Innervation: nerve to subclavius

Blood Supply: thoracoacromial trunk, clavicular branch

Question 5

serratus anterior

Answer 5

Origin: Anterior surface of medial border of the scapula

Insertion: Ribs 1-9

Action: Protracts and rotates the scapula, holds it against thoracic wall

Innervation: long thoracic nerve

Blood Supply: lateral and superior thoracic artery, thoracodorsal artery

Question 6

Coracobrachialis

Answer 6

Origin: Coracoid process of the scapula

Insertion: medial side of shaft of humerus

Action: adducts and flexes humerus

Innervation: Musculocutaneous nerve

Blood Supply: brachial artery

Question 7

Brachialis

Answer 7

Origin: Anterior aspect of humerus

Insertion: tuberosity of ulna

Action: flexes forearm

Innervation: musculocutaneous nerve

Blood Supply: brachial artery