Each of the following is a posterior muscle that moves the pectoral girdle EXCEPT the?

Question

A) trapezius

B) rhomboid major

C) serratus anterior

D) rhomboid minor

E) levator scapulae

Answer 1

Answer C is the answer to your question.  Only the serratus anterior has its origin (non-moving end of a muscle) on the anterior side of the body as its origin is the outer surface of ribs numbered 2-8.  Its insertion is the medial side of the scapula.

All of the other muscles have their origin on the spine.

Answer 2

answer C:

serratus anterior is part of the anterior thoracic muscles (together with pectoralis minor and subclavius muscles)

all the rest (A,B,D,E) are posterior thoracic muscles