Which muscle is NOT a part of the Deep Longitudinal System?

The Gluteus Medius is indeed not a part of the Deep Longitudinal System. This system primarily includes muscles that contribute to the stability and movement of the spine and lower extremities during activities such as walking, running, and lifting. The primary components of the Deep Longitudinal System are the erector spinae and the hamstrings, including the biceps femoris, which work together to stabilize the pelvis and spine.

The Gluteus Medius, on the other hand, is a part of the lateral subsystem, which is more associated with the stabilization of the pelvis during lateral movements and providing hip abduction. While it plays a crucial role in overall lower body function, its primary focus differs from the stabilizing actions emphasized in the Deep Longitudinal System. This distinction highlights the various roles different muscle groups play in maintaining body mechanics during different types of movement.