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Notes from PTA Exam Study guide by Scorebuilders.

C1 Dermatome

Vertex of Skull

C2 Dermatome

Temple, Forehead, Occiput

C3 Dermatome

Entire neck, posterior cheek, temporal 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 finger

C8 Dermatome

Medial arm and forearm to long, ring, and little finger

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

T3-T6 Dermatome

Upper Thorax

T5-T7 Dermatome

Costal margin

T8-T12 Dermatome

Abdomen and lumbar region

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, first, second, and third toes

S1 Dermatome

Buttock, thigh, and posterior leg

S2 Dermatome

Buttock, thigh, and posterior leg

S3 Dermatome

Groin, medial thigh to knee

S4 Dermatome

Perineum, genitals, lower sacrum


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