The document discusses the anatomy and function of the elbow joint, including the articulation of the radius and ulna with the humerus and the associated ligaments. It highlights the roles of specific muscles in elbow flexion and the effects of nerve injuries, particularly focusing on the radial and median nerves. Additionally, it details the connections of the ulnar collateral ligament and the structure of various nerves supplying the elbow joint.

1. Questions
Elbow Joint

2. At the elbow joint
1 the radius articulates with the capitulum of the humerus
2 the lateral collateral ligament of the elbow joint is attached to the
neck of radius
3 the medial (ulnar) collateral ligament of the elbow joint is attached
to the medial epicondyle of humerus
4 the brachialis muscle is attached to the capsule of the elbow joint
5 the superior radio-ulnar joint shares a synovial cavity with the
elbow joint

3. The lateral collateral ligament has no direct attachment to the radius. It is attached to
the annular ligament which surrounds the head and neck of radius.
At the elbow joint
1 the radius articulates with the capitulum of the humerus T
2 the lateral collateral ligament of the elbow joint is attached to the
neck of radius
F
3 the medial (ulnar) collateral ligament of the elbow joint is attached
to the medial epicondyle of humerus
T
4 the brachialis muscle is attached to the capsule of the elbow joint T
5 the superior radio-ulnar joint shares a synovial cavity with the
elbow joint
T

4. In the cubital fossa
1 the ulnar nerve lies lateral to the brachial artery
2 the tendon of biceps brachii lies medial to the
brachial artery
3 the median nerve lies medial to the brachial artery
4 the bicipital aponeurosis crosses deep to the brachial
artery
5 the median nerve is seen to enter the pronator teres
muscle

5. The ulnar nerve is not a content of the cubital fossa.
The biceps tendon lies lateral to the brachial artery.
The bicipital aponeurosis (also known as the lacertus fibrosus) runs obliquely downwards
and medially superficial to the brachial artery and median nerve)
The median nerve leaves the cubital fossa by coursing distally between the two heads of
pronator teres.
In the cubital fossa
1 the ulnar nerve lies lateral to the brachial artery F
2 the tendon of biceps brachii lies medial to the
brachial artery
F
3 the median nerve lies medial to the brachial artery T
4 the bicipital aponeurosis crosses deep to the brachial
artery
F
5 the median nerve is seen to enter the pronator teres
muscle
T

6. Transection of the radial nerve at the level of the humeral epicondyles will cause
1 loss of sensation in the nailbeds of index and middle fingers
2 wrist drop
3 paralysis of extensor pollicis longus
4 loss of cutaneous sensation on dorsum of ulnar border of hand
5 loss of extension of the elbow joint

7. The nailbeds of the index and middle fingers are innervated by the median nerve; not the
radial nerve.
Wrist drop occurs due to paralysis of virtually all the muscles in the extensor compartment
of forearm, including the wrist extensors
The dorsum of the ulnar aspect of hand is supplied by the dorsal branches of the ulnar
nerve, not by the radial nerve
The radial nerve’s branches to triceps brachii (the extensor of the elbow) are given off in the
proximal part of the arm. Consequently an injury to the radial nerve at the level of the
epicondyles will not compromise elbow extension.
Transection of the radial nerve at the level of the humeral epicondyles will cause
1 loss of sensation in the nailbeds of index and middle fingers F
2 wrist drop T
3 paralysis of extensor pollicis longus T
4 loss of cutaneous sensation on dorsum of ulnar border of hand F
5 loss of extension of the elbow joint F

8. Which of the following muscles are flexors of the elbow joint?
1 Coracobrachialis
2 Brachioradialis
3 Anconeus
4 Brachialis
5 Biceps brachii

9. Coracobrachialis does not cross the elbow joint, and consequently has no effect on
the elbow joint
When the forearm is in a semi-prone position, brachioradialis is a very effective
flexor of the elbow. Try it on yourselves!
Anconeus is a weak extensor of the elbow joint; not a flexor
Brachialis and biceps brachii are the principal flexors of the elbow joint
Which of the following muscles are flexors of the elbow joint?
1 Coracobrachialis F
2 Brachioradialis T
3 Anconeus F
4 Brachialis T
5 Biceps brachii T

10. Transection of the median nerve above the level of the elbow joint
1 would impair the function of flexor carpi ulnaris (FCU)
2 would affect cutaneous sensation on the lateral aspect of
forearm
3 would affect cutaneous sensation over the thenar region
4 would affect the function of abductor pollicis longus (APL)
5 would affect the function of abductor pollicis brevis (APB)

11. FCU is innervated by the ulnar nerve.
The cutaneous supply to the lateral part of forearm is by the lateral cutaneous nerve of
forearm, not median nerve.
APL is supplied by the radial nerve, not median nerve.
Transection of the median nerve above the level of the elbow joint
1 would impair the function of flexor carpi ulnaris (FCU) F
2 would affect cutaneous sensation on the lateral aspect of
forearm
F
3 would affect cutaneous sensation over the thenar region T
4 would affect the function of abductor pollicis longus (APL) F
5 would affect the function of abductor pollicis brevis (APB) T

12. A distal humeral fracture causing complete transection of the ulnar
nerve at the level of the medial epicondyle will produce
1 impairment of flexion of the distal interphalangeal joint of
index finger
2 cutaneous sensory loss over the medial aspect of the hand
3 weakness of pinch between index finger and thumb
4 wrist drop
5 wasting of all intrinsic muscles of the hand

13. Weakness of pinch is a consequence of paralysis of the adductor pollicis and 1st
dorsal interosseous
Wrist drop is caused by a radial nerve injury
A distal humeral fracture causing complete transection of the ulnar
nerve at the level of the medial epicondyle will produce
1 impairment of flexion of the distal interphalangeal joint of
index finger
F
2 cutaneous sensory loss over the medial aspect of the hand T
3 weakness of pinch between index finger and thumb T
4 wrist drop F
5 wasting of all intrinsic muscles of the hand F

14. The following nerves supply the elbow joint
1 Radial
2 Median
3 Ulnar
4 Axillary
5 Musculocutaneous

15. The following nerves supply the elbow joint
1 Radial T
2 Median T
3 Ulnar T
4 Axillary F
5 Musculocutaneous T
The axillary nerve supplies the shoulder joint.
The musculocutaneous nerve supplies the elbow joint as well as the shoulder
joint

16. At the elbow joint
1 The anterior band of the ulnar collateral ligament attaches
to the olecranon process of the ulna
2 The posterior band of the ulnar collateral ligament attaches
to the olecranon process of the ulna
3 The anterior band of the ulnar collateral ligament attaches
to the medial epicondyle of the humerus
4 The posterior band of the ulnar collateral ligament attaches
to the medial epicondyle of the humerus
5 The middle band of the ulnar collateral ligament attaches to
the coronoid process of the ulna

17. At the elbow joint
1 The anterior band of the ulnar collateral ligament attaches
to the olecranon process of the ulna
F
2 The posterior band of the ulnar collateral ligament attaches
to the olecranon process of the ulna
T
3 The anterior band of the ulnar collateral ligament attaches
to the medial epicondyle of the humerus
T
4 The posterior band of the ulnar collateral ligament attaches
to the medial epicondyle of the humerus
F
5 The middle band of the ulnar collateral ligament attaches to
the coronoid process of the ulna
F
The ulnar collateral ligament of the elbow joint has three bands
1.Anterior band is from the medial epicondyle of the humerus and attaches to the
coronoid process of the ulna
2.Posterior band is from the olecranon process of the ulna and attaches to the
coronoid process of the ulna
3.Middle band lies more deeply and connects the two

18. The radial collateral ligament has
1 1 band
2 2 bands
3 3 bands
4 4 bands
5 5 bands

19. The radial collateral ligament has
1 1 band T
2 2 bands F
3 3 bands F
4 4 bands F
5 5 bands F
The radial collateral ligament of the elbow joint is a single band that attaches to the
lateral epicondyle of the humerus just below the common extensor origin and it
blends with the annular ligament.

20. At the elbow joint
1 The ulna articulates with the capitulum
2 The ulna articulates with the trochlea
3 The radius articulates with the capitulum
4 The radius articulates with the trochlea
5 The annular ligament attaches to the ulna

21. At the elbow joint
1 The ulna articulates with the capitulum F
2 The ulna articulates with the trochlea T
3 The radius articulates with the capitulum T
4 The radius articulates with the trochlea F
5 The annular ligament attaches to the ulna T