Question

the rough surface feature on the proximal 1/3 of the lateral humerus is the
medial epicondyle.
lateral epicondyle.
radial groove.
coronoid process.
deltoid tuberosity.

Explanation:

The deltoid tuberosity is a rough surface on the proximal 1/3 of the lateral humerus where the deltoid muscle attaches. The medial epicondyle is on the medial side of the humerus. The lateral epicondyle is on the lateral side but more distally. The radial groove is for the radial nerve and not a rough surface feature in this context. The coronoid process is part of the ulna, not the humerus.

Answer:

E. deltoid tuberosity