Anatomy - Arm

Question 1

Arm

Answer 1

Anterior compartment

Posterior compartment

Question 2

Anterior fascial compartment and it’s neurovascular structure

Answer 2

“Flexor of elbow joint”

1. Coracobrachialis
2. Brachialis
3. Biceps (long, short head)

~ Musculocutaneous nerve
~ Brachial artery

++median nerve

Question 3

Posterior fascial compartment and it’s neurovascular structure

Answer 3

“Extensors of elbow joint”

Triceps

• long head
• lateral head
• medial head

~ Radial nerve
~ Profunda brachii artery

++ulnar nerve

Question 4

Cutaneous supply of the arm

Answer 4

1. Lateral cutaneous nerve (branch of radial C5,C6):
   Lateral surface below deltoid
2. Medial cutaneous nerve (branch of T1,T2):
   Medial side of the arm and armpit
3. Posterior cutaneous nerve (branch of radial C8):
   Back of the arm

Question 5

Superficial veins of the arm

Answer 5

1. Cephalic vein: Lateral to biceps, drain into axillary vein at infraclavicular fossa
2. Basilic veins: Medial side of biceps, pierce deep fascia halfway (at lower border of teres major) to become venae comitantes of brachial artery to form axillary veins

Question 6

Origin and insertion of long head, short head of biceps

Answer 6

Origin: Supraglenoid tubercle (LH), Coracoid process (SH)
Insertion: Radial tuberosity (Same)

Question 7

Supinator of forearm?

Answer 7

Long head of biceps brachii

Question 8

Origin and insertion of brachialis?

Answer 8

Origin: Anterior lower half of humerus
Insertion: Coronoid process of ulna

Question 9

Origin and insertion of coracobrachialis?

Answer 9

Origin: Coracoid process
Insertion: Medial aspect of humerus

Question 10

Origin and insertion of triceps?

Answer 10

Origin

1. Long head: infraglenoid tubercle
2. Lateral head: Upper posterior shaft of humerus
3. Medial head: Lower posterior shaft of humerus

Insertion: Olecranon process of ulna

Question 11

Branches of brachial artery

Answer 11

1. Nutrient artery to humerus
2. Profunda artery
3. Superior ulnar collateral
4. Inferior ulnar collateral
5. Muscular branch

Question 12

Describe median, ulnar and radial nerve pathway

Answer 12

1. Median: follow brachial artery (ant compartment)
2. Ulnar: Medial posterior compartment, insert medial to olecranon fossa
3. Radial: Lateral posterior compartment, comes anterior at cubital fossa lateral to brachialis