30 Questions
What is the common motor affection seen in a median nerve injury at the elbow?
Extension of the thumb, index, and middle fingers
Which muscles are affected in a median nerve injury at the wrist?
Thenar and lateral lumbrical muscles
What deformity is commonly observed in a median nerve injury at the elbow?
'Ape-like' hand deformity
What causes Carpal Tunnel Syndrome in relation to the median nerve?
Compression on the median nerve inside the carpal tunnel
Which area experiences sensory loss in a median nerve injury at the wrist?
Lateral 1/3 of the palm and anterior surface of lateral 3 & 1/2 finger
What is a common feature of motor affection in both median nerve injuries at the elbow and wrist?
'Ape-like' hand deformity
Where do the divisions of the trunks occur?
Behind the middle third of the clavicle
Which cord is formed by the anterior divisions of the upper + middle trunks?
Lateral cord
Where do the lateral and posterior cords lie in relation to the axillary artery?
Above and lateral to 1st part of axillary artery
Which nerve contributes to the formation of the medial cord?
T1 nerve
Where are the cords of the brachial plexus located?
Behind the middle third of the clavicle
Which cord gives off terminal branches?
Lateral cord
What injury can be caused by using badly fitting crutches?
Inferior dislocation of shoulder
Which muscles are affected by the lesion of the musculocutaneous nerve high up in the arm?
Coracobrachialis, biceps, and brachialis
What sensory affection is associated with damage to the musculocutaneous nerve?
Loss of sensation along the lower half of the deltoid muscle
Where does the musculocutaneous nerve originate from?
Lateral cord of the brachial plexus
Which muscle is paralyzed as a result of a lesion to the musculocutaneous nerve high up in the arm?
Coracobrachialis
What is a common motor affection associated with a lesion to the musculocutaneous nerve in the forearm?
Weakness in elbow flexion
Where does the ulnar nerve enter the hand?
Superficial to the flexor retinaculum
Which muscles receive muscular branches from the ulnar nerve in the forearm?
Flexor carpi ulnaris
Where does the ulnar nerve give palmar cutaneous branches?
Medial 1/3 of the palm
Which structures does the deep branch of the ulnar nerve supply in the hand?
Hypothenar muscles and interossei
Where is a common site for an ulnar nerve lesion?
At the wrist
What type of branches does the ulnar nerve provide to the elbow joint?
Articular branches
Which nerve innervates the lateral side of the forearm?
Lateral cutaneous nerve of the forearm
Which nerve innervates the medial side of the forearm?
Medial cutaneous nerve of the forearm
Which nerve innervates the posterior aspect of the forearm?
Posterior cutaneous nerve of the forearm
Which nerve innervates the lateral 2/3 of the dorsum of the hand and the lateral 3.5 fingers?
Superficial branch of radial nerve
Which injury results in 'claw hand' at the wrist?
Lesion of ulnar nerve at the elbow
'Wrist drop' is associated with a lesion in which nerve?
Radial nerve
Learn about the anatomy of the brachial plexus, including its trunks, divisions, and cords. Understand how the nerves of the upper limb originate and form this complex network in the neck and axilla.
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