medial supracondylar ridge medial supracondylar ridge the inferior third of the medial border of the humerus is raised into a slight ridge, the medial supracondylar ridge (or medial supracondylar line), which becomes very prominent below; it presents an anterior lip for the origins of the brachialis and pronator teres, a posterior lip for the medial head of the triceps brachii, and an intermediate ridge for the attachment of the medial intermuscular septum. medial supracondylar ridgeleft humerus. anterior view. (medial supracondylar ridge on side at bottom left, but not labeled.)detailsidentifierslatincrista supracondylaris medialista98a02.4.04.016ta21199fma75076anatomical terms of bone