NERVE LIBRARY · Upper limb

Radial nerve

Radial nerve

Wrist drop with brachioradialis involvement suggests a lesion above the PIN. Triceps helps assess a still more proximal level.

Roots / nucleus
C5–T1
Function
Mixed
3D protocols
2 related protocols

01Course and sensory territory

Posterior arm/forearm and radial dorsal hand; the branches affected depend on lesion height.

02Motor supply

Triceps, brachioradialis and ECRL; the deep branch/PIN supplies most finger extensors.

03Localization clues

Wrist drop with brachioradialis involvement suggests a lesion above the PIN. Triceps helps assess a still more proximal level.

04Combine the studies

Combine superficial radial sensory, EIP motor and radial muscles at different levels with non-radial C7 muscles.

Explore the related 3D protocols

Superficial radial sensoryG1 / G2 / Stimulation ↗Radial motor to extensor indicis propriusG1 / G2 / Stimulation ↗

These retain the existing source-supported landmarks and references. The 3D model is educational; clinical work requires palpation and measured distances.

Related muscles

Extensor carpi radialis longus · C6–C7Brachioradialis · C5–C6Triceps brachii · C6–C8, predominantly C7

Connect to a clinical question

Brachial Plexopathy
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References and further reading

Educational synthesis; independent neuromuscular specialist review is pending. Publication dates and compilation dates are distinct. This is an original teaching synthesis; consult the source for complete methods and criteria.