Wrist extensor compartments (diagram)

{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_examine_pipeline_reports":false,"can_pin":false},"extraPropsURL":"/studies/51547/annotated_viewer_json?iframe=true\u0026lang=us"}