Arm and Cubital Fossa

Question 1

what are the components of the anterior compartment of the arm

Answer 1

• flexors of the arm and elbow
• musculocutaneous nerve
• biceps brachii
• coracobrachialis
• brachialis

Question 2

describe the short head of biceps brachii

Answer 2

Attachment:
- coracoid process
Insertion:
- radial tuberosity
Function:
- supination and flexion of elbow (supine)
- resists dislocation
Innervation:
- Musculocutaneous nerve (C5,6)

Question 3

describe the long head of biceps brachii

Answer 3

Attachment:
- supraglenoid tubercle of scapula
Insertion:
- radial tuberosity
Function:
- supination and flexion of elbow
- prevents head of humerus from moving superiorly
Innervation:
- musculocutaneous nerve (C5,6)

Question 4

Describe the coracobrachialis

Answer 4

Attachment:
- coracoid process of scapula
Insertion:
- medial mid-shaft humerus
Function:
- flexion & adduction of arm
Innervation:
- musculocutaneous nerve (C5-7)

Question 5

describe the brachialis

Answer 5

Inferior to biceps brachii
Attachment:
- distal half of anterior surface of humerus
Insertion:
- ulnar tuberosity and coronoid process
Function:
- flexion of elbow
Innervation:
- musculocutaneous C5,6
- small component of lateral fibres from radial nerve C7

Question 6

describe the triceps brachii (long head)

Answer 6

Attachment:
- infraglenoid tubercle of scapula
Insertion:
- olecranon of ulna
Function:
- extends elbow joint
- resits dislocation
Innervation:
- radial nerve (C6-8)

Question 7

describe the triceps brachii (medial head)

Answer 7

Attachment:
- posterior surface of shaft of humerus
Insertion:
- olecranon of ulna
Function:
- extends elbow joint
Innervation:
- radial nerve (C6-8)

Question 8

describe the triceps brachii (lateral head)

Answer 8

Attachment:
- humerus superior to radial groove
Insertion:
- olecranon of ulna
Function:
- extends elbow joint
Innervation:
- radial nerve (C6-8)

Question 9

what are the branches of the brachial artery

Answer 9

• profunda brachii
• superior ulnar collateral
• radial collateral
• inferior ulnar collateral

Question 10

what are the boundaries of the cubital fossa

Answer 10

lateral = brachioradialis
medial = pronator teres
roof = skin, fascia, aponeurosis
floor = brachialis

Question 11

what veins lie in the superficial fascia above the cubital fossa

Answer 11

• cephalic
• basilic
  communicate via median cubital vein

Question 12

what are the contents of the cubital fossa

Answer 12

MEDIAL TO LATERAL
- median nerve
- bifurcation of brachial artery (ulnar & radial)
- tendon of biceps
- radial nerve
deep veins accompany the artery

Question 13

what is the function of the ligaments of the elbow joint

Answer 13

• medial and lateral collateral prevent abduction/adduction
• annular ligament around neck of radius allows pronation and supination