1.5 Arm Flashcards

1
Q
  • comes from lateral cord of brachial plexus, pierces the coracobrachialis
  • innervates all 3 flexors of the arm
  • ends as lateral cutaneous nerve of forearm
A

musculocutaneous nerve

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2
Q
  • injury to this nerve caused by weapons (stabbing)
  • paralysis of coracobrachialis, biceps, and brachialis
  • weakened forearm flexination and supination
  • loss of sensation of lateral surface of forearm
A

musculocutaneous nerve injury

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3
Q
  • direct continuation of posterior cord of brachial plexus
  • enters anterior to long head of triceps, descends with deep artery of arm
  • passes around humerus in radial groove, innervates triceps
A

Radial nerve

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4
Q

-injury before triceps: paralysis of triceps, brachioradialis, supinator and extensor muscles of wrist and digits
-injury after tricep branches:
same but tricep not paralyzed
-wrist drop sign

A

radial nerve injury

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5
Q
  • from union of lateral and medial cord
  • run lateral to brachial artery,, crosses medial and descend to cubital fossa, runs under bicipital aponeurosis
  • innervates elbow joint
A

median nerve

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6
Q
  • from medial cord
  • medial side of brachial artery, passes posterior to medial epicondyle and olecranon
  • “funny bone”, innervates elbow joint
A

ulnar nerve

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7
Q

pronator syndrome, due to heads of pronator teres muscle, pain and tenderness in proximal anterior forearm, Popes hand

A

median nerve injury

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8
Q

ulnar nerve compressed by flexor carpi ulnaris, “claw hand”

A

cubital tunnel syndrome

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