This is a detailed, step by step, description on how to palpate Extensor Pollicis Longus & Extensor Pollicis Brevis by Keith Bootsma, RMT.

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Extensor Pollicis Longus

Origin:
Middle 1/3 of Posterior Surface of the Ulna and Interosseous Membrane

Insertion:
Base of the Distal Phalanx of 1st Digit

Functions:
1 Extension of the 1st Digit @ CMC and MCP and IP Joints
2 Abduction (Radial Deviation) of the Hand @ Wrist Joint

Nerve:
Radial Nerve

Extensor Pollicis Brevis

Origin:
Distal 1/3 of Posterior Surface of the Radius and Interosseous Membrane

Insertion:
Base of Proximal Phalanx of 1st Digit

Functions:
1 Extension of the 1st Digit @ CMC and MCP Joints
2 Extension of the Hand @ the Wrist Joint

Nerve:
Radial Nerve