Anatomy · USMLE Step 1

USMLE Anatomy: Nerves and Dermatomes

Peripheral nerves, their motor/sensory territory, and dermatome landmarks (e.g. nipple = T4).

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Dermatome C3 corresponds to which anatomical landmark?
Lateral neck and ear lobe level
Dermatome C4 corresponds to which anatomical landmark?
Top of shoulder
Dermatome T4 corresponds to which anatomical landmark?
Nipple line
Dermatome T7 corresponds to which anatomical landmark?
Xiphoid process
Dermatome T10 corresponds to which anatomical landmark?
Umbilicus
Dermatome L1 corresponds to which anatomical landmark?
Inguinal ligament
Dermatome L4 corresponds to which anatomical landmark?
Knee (medial aspect)
Dermatome S1 corresponds to which anatomical landmark?
Lateral foot and heel
Dermatomes S2-S4 correspond to which anatomical region?
Anal and genital region
Dermatome T8 corresponds to which anatomical landmark?
Costal margin
Radial nerve injury causes which motor deficit?
Wrist drop, loss of finger extension
Ulnar nerve injury causes which hand deformity?
Claw hand (MCP hyperextension, PIP/DIP flexion)
Common peroneal nerve injury results in which gait abnormality?
Foot drop due to loss of dorsiflexion
Musculocutaneous nerve innervates which muscles?
Biceps, brachialis, and coracobrachialis
Axillary nerve innervates which muscles?
Deltoid and teres minor

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