Anatomy of the Brachial Plexus
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Questions and Answers

What is the common motor affection seen in a median nerve injury at the elbow?

  • Flexion of the ring and little fingers
  • Extension of the ring and little fingers
  • Extension of the thumb, index, and middle fingers (correct)
  • Flexion of the thumb, index, and middle fingers

Which muscles are affected in a median nerve injury at the wrist?

  • Pronator muscles
  • All extensors of the wrist
  • All flexors of the wrist
  • Thenar and lateral lumbrical muscles (correct)

What deformity is commonly observed in a median nerve injury at the elbow?

  • 'Claw-like' hand deformity
  • 'Ape-like' hand deformity (correct)
  • 'Benediction' hand deformity
  • 'Drop-wrist' deformity

What causes Carpal Tunnel Syndrome in relation to the median nerve?

<p>Compression on the median nerve inside the carpal tunnel (B)</p> Signup and view all the answers

Which area experiences sensory loss in a median nerve injury at the wrist?

<p>Lateral 1/3 of the palm and anterior surface of lateral 3 &amp; 1/2 finger (A)</p> Signup and view all the answers

What is a common feature of motor affection in both median nerve injuries at the elbow and wrist?

<p>'Ape-like' hand deformity (D)</p> Signup and view all the answers

Where do the divisions of the trunks occur?

<p>Behind the middle third of the clavicle (D)</p> Signup and view all the answers

Which cord is formed by the anterior divisions of the upper + middle trunks?

<p>Lateral cord (C)</p> Signup and view all the answers

Where do the lateral and posterior cords lie in relation to the axillary artery?

<p>Above and lateral to 1st part of axillary artery (B)</p> Signup and view all the answers

Which nerve contributes to the formation of the medial cord?

<p>T1 nerve (D)</p> Signup and view all the answers

Where are the cords of the brachial plexus located?

<p>Behind the middle third of the clavicle (B)</p> Signup and view all the answers

Which cord gives off terminal branches?

<p>Lateral cord (A)</p> Signup and view all the answers

What injury can be caused by using badly fitting crutches?

<p>Inferior dislocation of shoulder (C)</p> Signup and view all the answers

Which muscles are affected by the lesion of the musculocutaneous nerve high up in the arm?

<p>Coracobrachialis, biceps, and brachialis (D)</p> Signup and view all the answers

What sensory affection is associated with damage to the musculocutaneous nerve?

<p>Loss of sensation along the lower half of the deltoid muscle (A)</p> Signup and view all the answers

Where does the musculocutaneous nerve originate from?

<p>Lateral cord of the brachial plexus (C)</p> Signup and view all the answers

Which muscle is paralyzed as a result of a lesion to the musculocutaneous nerve high up in the arm?

<p>Coracobrachialis (B)</p> Signup and view all the answers

What is a common motor affection associated with a lesion to the musculocutaneous nerve in the forearm?

<p>Weakness in elbow flexion (D)</p> Signup and view all the answers

Where does the ulnar nerve enter the hand?

<p>Superficial to the flexor retinaculum (A)</p> Signup and view all the answers

Which muscles receive muscular branches from the ulnar nerve in the forearm?

<p>Flexor carpi ulnaris (C)</p> Signup and view all the answers

Where does the ulnar nerve give palmar cutaneous branches?

<p>Medial 1/3 of the palm (B)</p> Signup and view all the answers

Which structures does the deep branch of the ulnar nerve supply in the hand?

<p>Hypothenar muscles and interossei (D)</p> Signup and view all the answers

Where is a common site for an ulnar nerve lesion?

<p>At the wrist (B)</p> Signup and view all the answers

What type of branches does the ulnar nerve provide to the elbow joint?

<p>Articular branches (C)</p> Signup and view all the answers

Which nerve innervates the lateral side of the forearm?

<p>Lateral cutaneous nerve of the forearm (A)</p> Signup and view all the answers

Which nerve innervates the medial side of the forearm?

<p>Medial cutaneous nerve of the forearm (A)</p> Signup and view all the answers

Which nerve innervates the posterior aspect of the forearm?

<p>Posterior cutaneous nerve of the forearm (B)</p> Signup and view all the answers

Which nerve innervates the lateral 2/3 of the dorsum of the hand and the lateral 3.5 fingers?

<p>Superficial branch of radial nerve (B)</p> Signup and view all the answers

Which injury results in 'claw hand' at the wrist?

<p>Lesion of ulnar nerve at the elbow (C)</p> Signup and view all the answers

'Wrist drop' is associated with a lesion in which nerve?

<p>Radial nerve (B)</p> Signup and view all the answers

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