Question

A deltoid ridge occurs in
A. Radius
B. Ulna
C. Femur
D. Humerus

Answer 1

The deltoid ridge is formed in a bone to accommodate the deltoid muscle. The deltoid muscle is a triangular, albeit rounded, muscle. Remember the positions of each of these bones. Now try to associate the position of the deltoid muscle with them.

Complete answer:
A deltoid ridge is found in the humerus bone.
The deltoid muscle present in the upper part of the arm/shoulders. It is reminiscent of the Greek letter delta, hence the name. Let’s check the locations and characteristics of each option to find out the position of the deltoid ridge.

Radius – It is present in the forearm, and it is one of the two large bones present there. This bone extends to the thumb side of the wrist in each hand. The radius is thicker than its companion bone in the forearm.
Ulna – It is the second bone present in the forearm and runs parallel to the radius. The ulna is usually thinner and longer than the radius. It stretches to the small finger part of the wrist. Both the radius and the ulna starts from the elbow portion.
Femur – This bone is present in the leg. Commonly called the thigh bone, it is the longest single bone in the human body. The beginning of the bone is connected to the hip by a ball and socket joint. And this bone extends up to the knees.
Humerus – This bone is present from shoulder to the elbow in the upper arm. The connection between scapula and radius and ulna is mediated by the humerus bone. The humerus, like the femur, also forms a type of ball and socket joint. It is also located near the deltoid muscle, thus creating the need for a deltoid ridge.

So the deltoid ridge is present in the humerus.

Note:
It is very important to understand the positions of each bone in the skeletal system. The answer to this question can be found sensibly with that knowledge in hand. By elimination, the femur is in the leg, radius and ulna are more or less in the same position. So it is reasonable to assume correctly that the answer is the humerus.