Third Dorsal Wrist Compartment

This is a free supplement to The Resident’s Manual of Ultrasound-Guided Procedures.

The extensor pollicis longus resides here.

I instructed the patient to move his thumb here, confirming the location of the 3rd compartment.

I instructed the patient to move his other fingers here, confirming the location of the 4th compartment, to distinguish what is not the 3rd compartment.