QuestionsElbow Joint

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

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

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

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

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

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 extensorsThe dorsum of the ulnar aspect of hand is supplied by the dorsal branches of the ulnar

nerve, not by the radial nerveThe 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

Which of the following muscles are flexors of the elbow joint?

1 Coracobrachialis

2 Brachioradialis

3 Anconeus

4 Brachialis

5 Biceps brachii

Coracobrachialis does not cross the elbow joint, and consequently has no effect on the elbow jointWhen 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 flexorBrachialis 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

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)

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

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

Weakness of pinch is a consequence of paralysis of the adductor pollicis and 1st

dorsal interosseousWrist 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

The following nerves supply the elbow joint

1 Radial

2 Median

3 Ulnar

4 Axillary

5 Musculocutaneous

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

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

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 bands1.Anterior band is from the medial epicondyle of the humerus and attaches to the coronoid process of the ulna2.Posterior band is from the olecranon process of the ulna and attaches to the coronoid process of the ulna3.Middle band lies more deeply and connects the two

The radial collateral ligament has

1 1 band

2 2 bands

3 3 bands

4 4 bands

5 5 bands

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.

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

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