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</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</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</p> Signup and view all the answers

    Where do the divisions of the trunks occur?

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

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

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

    Which nerve contributes to the formation of the medial cord?

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

    Where are the cords of the brachial plexus located?

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

    Which cord gives off terminal branches?

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

    What injury can be caused by using badly fitting crutches?

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

    Where does the musculocutaneous nerve originate from?

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

    Where does the ulnar nerve enter the hand?

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

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

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

    Where does the ulnar nerve give palmar cutaneous branches?

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

    Where is a common site for an ulnar nerve lesion?

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

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

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

    Which nerve innervates the lateral side of the forearm?

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

    Which nerve innervates the medial side of the forearm?

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

    Which nerve innervates the posterior aspect of the forearm?

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

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

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

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

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

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