Dermatomes, Myotomes, Reflexes

C2 Dermatome

Posterior aspect of head

C3 Dermatome

Anterior and posterior aspect of neck

C4 Dermatome

AC joint

C5 Dermatome

Lateral Arm, (and clavicles)

C6 Dermatome

Lateral forearm and palmar tip of thumb

C7 Dermatome

Palmar distal phalanx of middle finger

C8 Dermatome

Palmar distal phalanx of little finger

T1 Dermatome

Medial Forearm

T2 Dermatome

Medial arm

T4 Dermatome

Level of Nipples

T6 Dermatome

xiphoid process

T10 Dermatome

Level of Umbilicus

L1 Dermatome

Inguinal Ligament and groin regions

L2 Dermatome

Anterior thigh, 2-3 inches below ASIS

L3 Dermatome

Anterior distal thigh and medial knee

L4 Dermatome

Patella, medial lower leg, and medial malleolus

L5 Dermatome

Lateral lower leg, dorsum of foot

S1 Dermatome

Lateral foot, heel

S2 Dermatome

Medial aspect of posterior thigh, posterior knee--popliteal fossa

S3-S5 Dermatome

Perineum

C1/C2 Myotome

Cervical Flexion and Extension

C3 Myotome

Cervical lateral flexion

C4 Myotome

Scapular elevation

C5 Myotome

Shoulder abduction

C6 Myotome

Elbow flexion, wrist extension

C7 Myotome

Elbow extension, wrist flexion

C8 Myotome

Thumb extension, finger flexion

T1 Myotome

Finger abduction

L1/L2 Myotome

Hip flexion

L3 Myotome

Knee extension

L4 Myotome

Ankle dorsiflexion

L5 Myotome

Great toe extension

S1 Myotome

Ankle plantar flexion

Hip extension

S2 Myotome

Knee flexion

If a deep tendon reflex is absent what is the score?

0

If a deep tendon reflex is slight what is the score?

1+

What is the score of a normal deep tendon reflex?

2+

If a deep tendon reflex is brisk what is the score?

3+

If a deep tendon reflex results in clonus what is the score?

4+

What is the level of the biceps reflex?

C5-C6

What is the level of the brachioradialis reflex?

C5-C6

What is the level of the triceps reflex?

C7-C8

What is the level of a patellar reflex?

L2-L4

What is the level of the achilles reflex?

S1-S2

What is the level of the hamstrings reflex?

L5-S2