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
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.