Shoulder is the lateral-most structure of the upper body. Thus, option a is correct.
What is lateral-most structure?
A lateral structure is a position away from the mid line of the body. The arms are lateral to the chest, and the ears are lateral to the head.
Lateral means away from to the side or the middle of the body. The example of lateral is the ears are lateral to the nose.
The central bony structure of the shoulder is the spacula, a point where all muscles interact.
The teres minor rotates the arms lateraly or externaly at the shoulder joints.
The shoulder is made up of three types of bones collar bone, spacula and upper arm bone.
The top of shoulder is known spacula or shoulder blade which is a large, flat and partially triangular bone that fix between humorous and collar bone.
Therefore, shoulder is the lateral-most structure of the upper body. Thus,option a is correct.
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