Nerve Root Dermatomes, Myotomes, Reflexes, and Paraesthesias Flashcards
C1 Dermatome
Vertex of skull
C2 Dermatome
Temple, forehead, occiput
C3 Dermatome
Entire neck, posterior cheek, temoral area, prolongation forward under mandible
C4 Dermatome
Shoulder area, clavicular area, upper scapular area
C5 Dermatome
Deltoid area, anterior aspect of entire arm to base of thumb
C6 Dermatome
Anterior arm, radial side of hand to thumb and index finger
C7 Dermatome
Lateral arm and forearm to index, long, and ring fingers
C8 Dermatome
Medial arm and forearm to long, ring, and little fingers
C1 Myotome
None
C2 Myotome
Longus colli, sternocleidomastoid, rectus capitis
C3 Myotome
Trapezius, splenius capitis
C4 Myotome
Trapezius, levator scapulae
C5 Myotome
Supraspinatus, infraspinatus, deltoid, biceps
C6 Myotome
Biceps, supinator, wrist extensors
C7 Myotome
Triceps, wrist flexors (rarely wrist extensors)
C8 Myotome
Ulnar deviators, thumb extensors, thumb adductors (rarely, triceps)
Biceps/Brachioradialis Reflex Root
C5/C6
Triceps Reflex Root
C7
C3 Paresthesias
Cheek, side of neck
C4 Paresthesias
Horizontal band along clavicle and upper scapula
C6 Paresthesias
Thumb and index finger
C7 Paresthesias
Index, long, and ring fingers
C8 Paresthesias
Little finger along or with two adjacent fingers; not ring or long fingers, alone or together (C7)
T1 Dermatome
Medial side of forearm to base of little finger
T2 Dermatome
Medial side of upper arm to medial elbow, pectoral and midscapular areas
L1 Dermatome
Back, over trochanter and groin
L2 Dermatome
Back, front of thigh to knee
L3 Dermatome
Back, upper buttock, anterior thigh and knee, medial lower leg
L4 Dermatome
Medial buttock, lateral thigh, medial leg, dorsum of foot, big toe
L5 Dermatome
Buttock, posterior and lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sole, 1st, 2nd, and 3rd toes
S1 Dermatome
Lateral and plantar aspect of foot
S2 Dermatome
Buttock, thigh, and leg posterior
S3 Dermatome
Groin, medial thigh to knee
S4 Dermatome
Perineum, genitals, lower sacrum
L2 Myotome
Psoas, hip adductors
L3 Myotome
Psoas, quadriceps, thigh atrophy
L4 Myotome
Tibialis anterior, extensor hallucis
L5 Myotome
Extensor hallucis, peroneals, gluteus medius, dorsiflexors, hamstrings and calf atrophy
S1 Myotome
Calf and hamstrings, wasting of gluteals, peroneasl, plantar flexors
S2 Myotome
Calf and hamstrings, wasting of gluteals, plantar flexors
S4 Myotome
Bladder, rectum
Knee Jerk Reflex Root
L3/L4
Achilles Reflex Root
S1/S2
L1 Paresthesias
Groin; after holding posture, which causes pain
L2 Paresthesias
Occasionally anterior thigh
L3 Paresthesias
Medial knee, anterior lower leg
L4 Paresthesias
Medial aspect of calf and ankle
L5 Paresthesias
Lateral aspect of leg, medial three toes
S1 Paresthesias
Lateral two toes, lateral foot, lateral leg to knee, plantar aspect of foot
S2 Paresthesias
Lateral leg, knee, and heel
S4 Paresthesias
Saddle area, genirals, anus, impotence, massive posterior herniation