Learn: USMLE MSK Nerve Injuries (by rizubuta) - Memorize.com

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Upper Extremity Nerve Injuries

Nerve	Answer	Question	Number
Axillary	C5-6	Nerve Roots	2
Radial	C5-T1	Nerve Roots	5
Median	C5-T1	Nerve Roots	5
Ulnar	C8-T1	Nerve Roots	2
Musculocutaneous	C5-7	Nerve Roots	3
Axillary	Fractured surgical neck of humerus/dislocation of humeral head	Typical injury	2
Radial	Fractured midshaft of humerus/compression of axilla by chair-crutches	Typical injury	2
Median	Fracture of supracondylar humerus	Typical injury	1
Ulnar	Fracture of epicondyle of humerus	Typical injury	1
Musculocutaneous	Upper trunk compression	Typical injury	1
Axillary	Deltoid (arm abduction)	Motor deficit	1
Radial	BEST/Brachioradialis/Extensors/Supinator/Triceps	Motor deficit	4
Median	Opposition of thumb/Lateral finger flexion/wrist flexion	Motor deficit	3
Ulnar	Medial finger flexion/wrist flexion	Motor deficit	2
Musculocutaneous	Biceps/brachialis/coracobrachialis (flexion of elbow)	Motor deficit	3
Axillary	Over deltoid	Sensory deficit	1
Radial	Posterior arm/dorsal hand-thumb	Sensory deficit	2
Median	Dorsal-palmar lateral 3.5 fingers/thenar eminence	Sensory deficit	2
Ulnar	Medial 1.5 fingers/hypothenar eminence	Sensory deficit	2
Musculocutaneous	Lateral forearm	Sensory deficit	1
Axillary	Atrophied deltoid	Sign	1
Radial	Wrist drop	Sign	1
Median	Ape hand (loss of opponens pollicis)/Pope's hand (open digits 1-3 when trying to make fist)	Sign	2
Ulnar	Radial deviation of wrist upon flexion/claw hand	Sign	2
Long thoracic	C5-7	Nerve Roots	3
Long thoracic	Mastectomy	Typical injury	1
Long thoracic	Serratus anterior (abduction above horizontal)	Motor deficit	1
Long thoracic	Winged scapula/ipsilateral lymphedema	Sign	2
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Lower Extremity Nerve Injuries

Nerve	Answer	Question	Number
Obturator	L2-L4	Nerve Roots	3
Femoral	L2-L4	Nerve Roots	3
Common peroneal	L4-S2	Nerve Roots	4
Tibeal	L4-S3	Nerve Roots	5
Superior gluteal	L4-S1	Nerve Roots	3
Inferior gluteal	L5-S2	Nerve Roots	3
Obturator	Anterior hip dislocation	Typical injury	1
Femoral	Pelvic fracture	Typical injury	1
Common peroneal	Trauma-compression of lateral aspect of leg/fibula neck fracture	Typical injury	2
Tibeal	Knee trauma	Typical injury	1
Superior gluteal	Posterior hip dislocation/polio	Typical injury	2
Inferior gluteal	Posterior hip dislocation	Typical injury	1
Obturator	Thigh adduction	Motor deficit	1
Femoral	Thigh flexion/leg extension	Motor deficit	2
Common peroneal	Foot eversion/dorsiflection/toe extension	Motor deficit	3
Tibeal	Foot inversion/plantarflexion/toe flexion	Motor deficit	3
Superior gluteal	Thigh abduction (gluteus medius/minimus)	Motor deficit	2
Inferior gluteal	Gluteus maximus	Motor deficit	1
Obturator	Medial thigh	Sensory deficit	1
Femoral	Anterior thigh/medial leg	Sensory deficit	2
Common peroneal	Anterolateral leg/dorsal foot	Sensory deficit	2
Tibeal	Sole of foot	Sensory deficit	1
Common peroneal	Foot drop/foot slap/steppage gait	Sign	3
Superior gluteal	Trendelenburg (Contralateral hip drops on standing on leg ipsilateral to injury)	Sign	1
Inferior gluteal	Cant jump/climb stairs/rise from seated	Sign	3
Sciatic nerve	L4-S3	Nerve Roots	5
Sciatic nerve	Posterior thigh	Typical injury	1
Sciatic nerve	All of common peroneal/tibial	Motor deficit	2
Sciatic nerve	All of common peroneal/tibial	Sensory deficit	2
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Brachial plexus lesions

Nerve	Answer	Question	Number
Upper trunk	C5-C6	Nerve Roots	2
Upper trunk	Delivery trauma	Typical injury	1
Upper trunk	Paralysis of abductors/lateral rotators/biceps	Motor deficit	3
Upper trunk	Erb-Duchenne palsy/Waiter's tip (limb by side/medially rotated/forearm pronated)	Sign	2
Lower trunk	C8-T1	Nerve Roots	2
Lower trunk	Thoracic outlet syndrome/pancoast tumor of lung	Typical injury	2
Lower trunk	Thenar/hypothenar eminences/interosseous	Motor deficit	3
Lower trunk	Medial forearm/hand	Sensory deficit	2
Lower trunk	Klumpke's palsy/total claw hand/loss of radial pulse on ipsilateral head rotation	Sign	3
Posterior cord	C5-T1	Nerve Roots	5
Posterior cord	Fractured midshaft of humerus/compression of axilla by chair-crutches	Typical injury	2
Posterior cord	BEST/Brachioradialis/Extensors/Supinator/Triceps	Motor deficit	4
Posterior cord	Posterior arm/dorsal hand-thumb	Sensory deficit	2
Posterior cord	Wrist drop	Sign	1
Long thoracic	C5-7	Nerve Roots	3
Long thoracic	Mastectomy	Typical injury	1
Long thoracic	Serratus anterior (abduction above horizontal)	Motor deficit	1
Long thoracic	Winged scapula/ipsilateral lymphedema	Sign	2
Axillary	C5-6	Nerve Roots	2
Axillary	Fractured surgical neck of humerus/dislocation of humeral head	Typical injury	2
Axillary	Deltoid (arm abduction)	Motor deficit	1
Axillary	Over deltoid	Sensory deficit	1
Axillary	Atrophied deltoid	Sign	1
Radial nerve	C5-T1	Nerve Roots	5
Radial nerve	Fractured midshaft of humerus/compression of axilla by chair-crutches	Typical injury	2
Radial nerve	BEST/Brachioradialis/Extensors/Supinator/Triceps	Motor deficit	4
Radial nerve	Posterior arm/dorsal hand-thumb	Sensory deficit	2
Radial nerve	Saturday night palsy (wrist drop)	Sign	1
Musculocutaneous nerve	C5-7	Nerve Roots	3
Musculocutaneous nerve	Biceps/brachialis/coracobrachialis (flexion of elbow)	Motor deficit	3
Musculocutaneous nerve	Variable	Sensory deficit	1
Median nerve	C5-T1	Nerve Roots	5
Median nerve-proximal	Fracture of supracondylar humerus	Typical injury	1
Median nerve-proximal	Decreased thumb opposition/finger flexion	Motor deficit	2
Median nerve-proximal	Pope's blessing (upon flexion only 4th/5th digits flex/1-3 remain extended)	Sign	1
Median nerve-distal	Carpal tunnel/dislocated lunate	Typical injury	2
Median nerve-distal	Loss of lateral lumbricles (2-3)	Motor deficit	1
Median nerve-distal	Median claw (2nd-3rd fingers claw when attempting to extend hand)	Sign	1
Ulnar nerve	C8-T1	Nerve Roots	2
Ulnar nerve-proximal	Fracture of epicondyle of humerus	Typical injury	1
Ulnar nerve-proximal	Medial finger flexion/wrist flexion	Motor deficit	2
Ulnar nerve-proximal	Medial 1.5 fingers/hypothenar eminence	Sensory deficit	2
Ulnar nerve-proximal	Radial deviation of wrist upon flexion/claw hand	Sign	2
Ulnar nerve-distal	Falling onto oustretched hand	Typical injury	1
Ulnar nerve-distal	Loss of medial lumbricles	Motor deficit	1
Ulnar nerve-distal	Ulnar claw (4th-5th digits cannot extend when attempting to open hand)	Sign	1
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Nerve Roots

Nerve	Roots
Axillary	C5-6
Radial	C5-T1
Median	C5-T1
Ulnar	C8-T1
Musculocutaneous	C5-7
Obturator	L2-L4
Femoral	L2-L4
Common peroneal	L4-S2
Tibeal	L4-S3
Superior gluteal	L4-S1
Inferior gluteal	L5-S2
Sciatic nerve	L4-S3
Upper trunk	C5-C6
Long thoracic	C5-7
Posterior cord	C5-T1
Lower trunk	C8-T1
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USMLE MSK Nerve Injuries

Upper Extremity Nerve Injuries

Lower Extremity Nerve Injuries

Brachial plexus lesions

Nerve Roots

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