Which muscle is a broad, flat, thin muscle that covers most of the lateral surface of the cervical and thoracic vertebrae?

A) supraspinatus
B) rhomboideus thoracis
C) infraspinatus
D) splenius
E) teres major

The broad, flat, thin muscle that covers most of the lateral surface of the cervical and thoracic vertebrae is the splenius muscle. The supraspinatus, infraspinatus, rhomboideus thoracis, and teres major are all located in different areas of the body and have different shapes and functions.