Nerve Root Involvement from Herniated Disc

Root	Disc	Sensory	Motor	Reflex
C 5	C 4-5	Lateral & Anterior Arm (Axillary nerve)	Deltoid, Rotator cuff	Biceps
C6	C 5-6	Radial Forearm (Musculocutaneus) Dorsum of Hand (Superficial Radial)	Biceps, Extensor carpi radialis longus & brevis, Brachioradialis	Brachioradialis
C7	C 6-7	3rd. digit (Median & radial)	Triceps, Extensor digitorum, Flexor carpi radialis	Triceps
C8	C7-T1	Ulnar side of forearm, hand & 4&5th digits Med. Antebrachial cutaneous, Ulnar	Flexor digitorum superficialis & profundus	***
T1	T1-2	Medial side of arm Medial Brachial Cutaneous	Interossei, Lumbricals, thenar	***
L3	L2-3	Anterior & Medial Thigh (femoral)	Quadriceps Adductors	***
L4	L3-4	Medial leg (saphenous br. of femoral n.)	Tibialis anterior Tibialis posterior	Patellar
L5	L4-5	Lateral leg & dorsum of foot (common peroneal)	Extensor Digitorum Longus; Gluteus medius & minimus
S1	L5-S1	Lateral & plantar surface of foot (sural; tibial)	Peroneus longus & brevus; triceps surae, gluteus maximus	Achilles