Forearm Flashcards

1
Q

What innervates the muscles of the deep flexor compartment of the forearm?

A

AIN

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2
Q

What is the innervation of flexor digitorum profundus?

A

Radial 2: AIN Ulnar 2: ulnar

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3
Q

What is the innervation of FPL?

A

AIN

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4
Q

What is the innervation of pronator quadratus?

A

AIN

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5
Q

What innervates the superficial flexor compartment of the forearm?

A

Median nerve

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6
Q

Where does ECRL insert?

A

2nd metacarpal

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7
Q

Where does ECRB insert?

A

3rd metacarpal (it’s shorter than ECRL)

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8
Q

Where does brachioradialis insert?

A

styloid process

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9
Q

What innervates ECRB?

A

PIN

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10
Q

What innervates the mobile wad, aside from ECRB?

A

radial nerve

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11
Q

What innervates ECU?

A

PIN

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12
Q

What is the Space of Parona?

A

Potential space in the forearm between FPL, FDP and pronator quadratus

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13
Q

What is Wartenberg’s Syndrome

A

AKA Cheiralgia paresthetica

Superficial radial nerve compression between ECRL and BR, commonly from fascial band where it emerges from these muscles ~9cm from the wrist

Presents with pain or dysthesia on dorsal radial forearm radiating to thumb. - Tinel’s sign over superficial radial nerve is most common finding

Differential

De Quervain’s tenosynovitis

pain is not aggravated by wrist pronation, unlike Wartenberg Syndrome

Lateral antebrachial cutaneous nerve (LACN) neuritis

positive Tinel’s sign over LACN can be mistaken for positive Tinel’s over superficial sensory radial nerve

Intersection syndrome

may have dorsoradial forearm swelling

symptom exacerbation and “wet leather” crepitus on repeated wrist flexion/extension

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14
Q

What are the boundaries of the radial tunnel?

A
  • 5cm in length
  • from the radiocapitellar joint extending PAST the proximal edge of the supinator
  • lateral BR, ECRL, ECRB
  • Medial - biceps tendon and brachialis
  • floor - capsule of radiocapitellar joint
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15
Q

What 3 muscles in the extensor compartment of the forearm does the PIN not innervate?

A

the mobile wad (innervated by radial nerve proper)

ECRB (although this is variable)

ECRL

brachioradialis

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