Dermatomes

Question 1

C1

Answer 1

Vertex of skull

Question 2

C2

Answer 2

Temple, forehead, occiput: Weak: Longus coli, SCM, rectus capitis

Question 3

C3

Answer 3

Entire neck, post. cheek, under mandible:

Weak: Trap, splines capitis

Question 4

C4

Answer 4

shoulder area, clavicle, upper scap:

Weak: trap, levator. Paresthesia: horizontal band along clavicle and upper scapula

Question 5

C5

Answer 5

Deltoid, anterior arm to base of thumb
Weak: Supraspinatus, infra., deltoid, bicep.
Reflex: bicep, brachioradialis

Question 6

C6

Answer 6

Anterior arm, radial side of hand to thumb and index.
Weak: Biceps, supinator, wrist extensors
Reflex: bicep, brachioradialis
Parasthesia: thumb and index finger

Question 7

C7

Answer 7

Lateral arm and forearm to index, long and ring fingers
Weak: Triceps, wrist flexors
Reflex: triceps
Para: index, long and ring fingers

Question 8

C8

Answer 8

Medial arm and forearm to long, ring and little fingers
weak: ulnar deviators, thumb extensors and adductors
Reflex: triceps
Para: little finger alone

Question 9

T1 T2

Answer 9

Medial side of forearm to base of little finger, medial side of upper arm to medial elbow, pectoral and midscap

Question 10

T3-T12

Answer 10

T3-T6 upper thorax, T5-t7 costal margin, T8-t12 abdomen and lumbar

Question 11

L1

Answer 11

Back, over trochanter and groin.

Para: groin, after holding posture

Question 12

L2

Answer 12

Back, from of thigh to knee
Weak: psoas, hip adductors
Para: occasionally ant. thigh

Question 13

L3

Answer 13

Back, upper buttock, ant. thigh and knee, medial lower leg
Weak: psoas, quad
Reflex: knee jerk slow, pain on full SLR
Para: medial knee, ant. lower leg

Question 14

L4

Answer 14

Medial butt, lateral thigh, medial leg, dorm of foot, big toe
Weak: tib. ant., ext. hallucis
Reflex: Weak or absent knee jerk, side flexion limited.
Para: medial aspect of calf and ankle

Question 15

L5

Answer 15

Butt, post. and lat. thigh, lat. leg, dorm of foot, medial half of sole, 1st, 2nd, 3rd toes
Weak: extensor hallucis, peroneals, glut. med, dorsiflexors, hamstring and calf atrophy
Para: lateral aspect of leg, medial three toes

Question 16

S1

Answer 16

Butt, thigh, post. leg
Weak: calf and ham, gluteals, peroneals, plantars
Reflex: SLR limited, achilles weak or absent
Para: lat. two toes, lateral foot, lat. leg to knee, plantar foot

Question 17

S2

Answer 17

Same as S1, ex peroneals strong

Question 18

S3

Answer 18

Groin, medial thigh to knee

Question 19

S4

Answer 19

perineum, genitals, lower sacrum
Weak: bladder, rectum
Para: saddle area, genitals, anus, impotence, massive post. herniation