Median nerve
Median nerve
Nocturnal radial-digit paresthesia suggests carpal tunnel involvement. Forearm weakness or thenar skin sensory loss warrants a proximal assessment.
C6–T1; some references include C5✓ Read
NCV / EMG LEARNING
Nerve library
31 nerves and major branches. Connect myotomes, sensory territories and localization to 17 existing 3D protocols.
Anterior interosseous nerve
Anterior interosseous nerve · AIN
Weak thumb IP and index DIP flexion produces a flattened tip-to-tip pinch or incomplete OK sign.
Predominantly C8–T1✓ Read
Ulnar nerve
Ulnar nerve
A reproducible focal across-elbow abnormality supports elbow localization. Dorsal ulnar sensory sparing can help assess a Guyon canal lesion.
C8–T1; possible C7 contribution✓ Read
Dorsal ulnar cutaneous nerve
Dorsal ulnar cutaneous nerve · DUC
Guyon canal lesions usually spare this branch; an abnormal response may suggest a more proximal lesion.
C8–T1✓ Read
Radial nerve
Radial nerve
Wrist drop with brachioradialis involvement suggests a lesion above the PIN. Triceps helps assess a still more proximal level.
C5–T1✓ Read
Posterior interosseous nerve
Posterior interosseous nerve · PIN
Finger extension weakness with preserved skin sensation. Wrist extension may remain, often with radial deviation.
Predominantly C7–C8✓ Read
Superficial radial nerve
Superficial radial sensory nerve
Radial dorsal hand paresthesia after wristband compression or local injury, without wrist or finger extension weakness.
Predominantly C6–C8✓ Read
Musculocutaneous nerve
Musculocutaneous nerve
Weak elbow flexion and supination with lateral forearm sensory changes.
C5–C7✓ Read
Lateral antebrachial cutaneous nerve
Lateral antebrachial cutaneous nerve · LABC
Adds sensory information when assessing musculocutaneous, lateral-cord or upper-trunk lesions.
Predominantly C5–C6✓ Read
Medial antebrachial cutaneous nerve
Medial antebrachial cutaneous nerve · MABC
Provides non-ulnar sensory information in lower-trunk or medial-cord assessment.
C8–T1, predominantly T1✓ Read
Axillary nerve
Axillary nerve
Weak shoulder abduction and lateral shoulder numbness after dislocation.
C5–C6✓ Read
Suprascapular nerve
Suprascapular nerve
Isolated infraspinatus involvement may suggest the spinoglenoid notch; both muscles suggest a more proximal site.
C5–C6✓ Read
Long thoracic nerve
Long thoracic nerve
Medial scapular winging during a wall push may indicate serratus anterior weakness.
C5–C7✓ Read
Spinal accessory nerve
Spinal accessory nerve · CN XI
Shoulder droop, weak shrug or lateral scapular winging after neck surgery.
Spinal accessory motor nucleus; not a single brachial root✓ Read
Dorsal scapular nerve
Dorsal scapular nerve
Weak scapular retraction; provides information from a proximal root branch when comparing root and plexus lesions.
Mainly C5✓ Read
Sciatic nerve
Sciatic nerve
Fibular-division involvement is often more prominent and may resemble an isolated foot drop.
L4–S3✓ Read
Common fibular nerve
Common fibular (peroneal) nerve
Weak dorsiflexion and eversion with relatively preserved inversion supports a fibular localization.
L4–S2✓ Read
Deep fibular nerve
Deep fibular (peroneal) nerve
A distal anterior ankle lesion may affect EDB and first-web sensation while sparing proximal TA.
Predominantly L4–S1✓ Read
Superficial fibular nerve
Superficial fibular (peroneal) nerve
Eversion weakness with dorsal foot sensory changes; a distal cutaneous lesion may be sensory only.
Predominantly L5–S1✓ Read
Tibial nerve
Tibial nerve
Calf involvement helps distinguish a proximal tibial lesion from distal tarsal tunnel disease.
L4–S3✓ Read
Sural nerve
Sural nerve
A commonly tested sensory nerve in length-dependent polyneuropathy assessment.
Predominantly S1–S2✓ Read
Medial plantar nerve
Medial plantar nerve
Focal plantar symptoms may involve distal tibial branches or the tarsal tunnel.
Tibial branch; assess the target-muscle myotome✓ Read
Lateral plantar nerve
Lateral plantar nerve
A distal branch lesion may cause focal plantar symptoms; compare with broader tibial involvement.
Predominantly S1–S2✓ Read
Femoral nerve
Femoral nerve
Weak knee extension and a reduced knee reflex, with relatively preserved hip adduction.
L2–L4✓ Read
Saphenous nerve
Saphenous nerve
Helps evaluate femoral or lumbar plexus lesions and may be injured locally after surgery.
L3–L4✓ Read
Lateral femoral cutaneous nerve
Lateral femoral cutaneous nerve · LFCN
Meralgia paresthetica is a sensory syndrome without primary muscle weakness.
L2–L3✓ Read
Obturator nerve
Obturator nerve
Hip adduction weakness suggests involvement of obturator-supplied muscles.
L2–L4✓ Read
Superior gluteal nerve
Superior gluteal nerve
Weak hip abduction or a Trendelenburg sign adds non-fibular information about L5.
L4–S1✓ Read
Inferior gluteal nerve
Inferior gluteal nerve
Hip extension weakness provides proximal L5–S2 information outside the sciatic nerve.
L5–S2✓ Read
Facial nerve
Facial nerve · CN VII
Facial motor conduction and blink reflexes provide information about different parts of the pathway.
Facial motor nucleus in the pons✓ Read
Phrenic nerve
Phrenic nerve
Unexplained respiratory weakness or weaning difficulty may prompt specialist assessment of nerve, muscle and NMJ causes.
C3–C5, predominantly C4✓ Read
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