Muscle, which is anatomically a back muscle, but functionally related to thorax is:
Ans. b. Lattisimus dorsi Muscle, which is anatomically a back muscle, but functionally related to thorax is Latisimus dorsi. The latissimus dorsi muscle is the widest muscle on the back though it mostly acts as a shoulder muscle.
Rhomboid
Latisimus dorsi
Trapezius
Levator costae