Arm

Question 1

axilla muscles - anterior wall

Answer 1

1. Pectoralis major 2. Pectoralis minor 3. Subclavius

Question 2

pec major

Answer 2

Pectoralis major – Origin • medial2/3clavicle • bodyofsternum • costalcartilages2-6 – Insertion • laterallipofintertubercular sulcus of humerus – Action • shoulderflexion,adduction,& medial rotation – Innervation • medial & lateral pectoral nerves

Question 3

pec minor

Answer 3

Pectoralis minor – Origin • ribs 3-5 – Insertion • coracoid process of scapula – Action • scapula depression, protraction & downward rotation • elevate ribs – Innervation • medial pectoral nerve

Question 4

subclavius

Answer 4

Subclavius – Origin • rib1 – Insertion • groove for subclavius on inferior surface of clavicle – Action • shoulder depression & protraction – Innervation • nerve to subclavius

Question 5

serratus anterior

Answer 5

Serratus anterior – Origin • ribs 1-8 or 9 – Insertion • medial border of scapula – Action • scapula protraction & upward rotation • elevate ribs – Innervation • long thoracic nerve

Question 6

axilla posterior wall muscles

Answer 6

1. Subscapularis 2. Teres major 3. Latissimus dorsi

Question 7

latissimus dorsi

Answer 7

Latissimus dorsi – Origin • T7-L5 spinous processes • ribs 8-12 • thoracolumbar fascia – Insertion • floor of intertubercular sulcus of humerus – Action • shoulder extension, adduction & medial rotation – Innervation • thoracodorsal nerve

Question 8

distal humerus

Answer 8

Question 9

proximal radius

Answer 9

Question 10

proximal ulna

Answer 10

Question 11

muscles of the anterior compartment of the arm

Answer 11

• Biceps brachii
• Coracobrachialis • Brachialis

Question 12

biceps brachii

Answer 12

Biceps brachii

– Origin

Short head – coracoid process of scapula

Long head – supraglenoid tubercle

– Insertion

• Radial tuberosity

– Innervation

• Musculocutaneous nerve (lateral cord, C5-C7)

– Actions

Flexion of elbow & shoulder

Supination

Question 13

coracobrachialis

Answer 13

Coracobrachialis

– Origin
• coracoid process

– Insertion
• Medial humeral diaphysis

– Innervation

• Musculocutaneous nerve (lateral cord, C5-C7)

– Actions
• Should adduction & flexion

Question 14

brachialis

Answer 14

Brachialis

– Origin
• Anterior, distal humeral diaphysis

– Insertion
• ulnar tuberosity

– Innervation

Musculocutaneous nerve (lateral cord, C5-C7)

Radial nerve (posterior cord, C5-T1)

– Actions

• Flexion of elbow

Question 15

triceps

Answer 15

Triceps brachii

– Origin

Long head – infraglenoid tubercle of scapula

Lateral head – superior, lateral humeral diaphysis

Medial head – posterior humerus inferior to radial groove

– Insertion

• Olecranon process of ulna

– Innervation
• Radial nerve (posterior cord, C5-T1)

– Actions
• Extension of elbow & shoulder

Question 16

arteries of the arm

Answer 16

Question 17

venous drainage of the arm

Answer 17

Question 18

nerves of the arm

Answer 18

Question 19

brachial plexus

Answer 19

Question 20

dermatomes

Answer 20

Question 21

cutaneous sensation of the arm

Answer 21