From the case:
Tibialis posterior muscle (Gray's illustration)
{"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/37885/annotated_viewer_json?lang=us"}
Tibialis posterior muscle.
All anterior leg muscle images from the 10th editiong of Gray's anatomy (now out of copyright and PD) except:Piriformis location