Final answer:
The bulge medial to the olecranon process at the distal end of the humerus is the medial epicondyle of the humerus, which is an important muscle attachment site.
Step-by-step explanation:
The bulge located at the distal, medial portion of the humerus, a bit medial to the olecranon process, is known as the medial epicondyle of the humerus. This prominent bony projection serves as an attachment point for muscles that act on the forearm, wrist, and hand, particularly the powerful grasping muscles of the anterior forearm. The olecranon process, in comparison, is found on the posterior surface of the ulna and forms the bony tip of the elbow.