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Peripheral NS

Nerve segments, innervations, distributions, MMT's

NerveSpinal Cord SegmentMuscle InnervationSensory DistributionMotor Features of Paralysis
Median Nerve C6, C7, C8, T1 Pronators, wrist and finger flexors on radial side, most thumb muscles Palmar aspects of thumb, second, third, and fourth, (radial half) fingers Loss of forearm pronation, thumb opposition, flexion, and abduction
Ulnar Nerve C7, C8, T1 FCU, FDP (medial half), interossei, 4th and 5th lumbricals Fourth finger (medial portion), 5th finger Loss of wrist ulnar deviation, weakened wrist and finger flexion, weakened 4th and 5th finger flexion, loss of thumb adduction, loss of most intrinsics (claw hand)
Sciatic Nerve L4, L5, S1, S2, S3 (high muscles) Hamstrings, Adductor Magnus Through its terminal branches of the tibia, superficial fibular, and deep fibular nerves Loss of knee flexion, weak hip adduction, and loss of all muscle function below the knee
Femoral Nerve L2, L3, L4 Sartorius, Quadriceps, Iliacus, Pectineus Middle anterior thigh and medial thigh proximal to the knee Loss of hip flexion and knee extension
Tibial Nerve L4, L5, S1, S2, S3 (lower muscles) Gastrocnemius, Soleus, Plantaris, Popliteus, Tibilais Posterior Posterior/lateral calf, ankle, and heel Loss of plantar flexion and supination
Superficial Fibular (Peroneal) Nerve L5, S1, S2 Fibularis longus and brevis Anterior/lateral distal lower leg and ankle and most of the dorsum of the foot Loss of eversion
Deep Fibular (Peroneal) Nerve L4, L5, S1, S2 Tibialis anterior, EHL, EDL, Fibularis tertius, 1st & 2nd dorsal interossei, EDB, EHB Web space between the 1st and 2nd toes on the dorsum of the foot Loss of dorsiflexion (drop foot) and weakness in the foot intrinsics
Musculocutaneous Nerve C5, C6 (further down Coracobrachialis, Biceps Brachii, Brachialis Anterolateral surface of forearm loss of forearm flexion when supinated, weakened supination
Axillary Nerve C5, C6 (further up) Deltoid, Teres Minor Lateral arm over lower portion of deltoid Loss of shoulder abduction, weakened external rotation
Radial Nerve C5, C6, C7, C8, T1 Triceps, Anconeous, Brachioradialis, Supinator, Wrist, fingers, and thumb extensors Posterior arm, posterior forearm, and radial side of posterior hand Loss of elbow, wrist, finger, and thumb extension
Created by: jvlassov