Hawaii Massage License Practice Exam

Which muscle extends from the thorax to the pubis?

1. Quadratus lumborum

2. Rectus abdominis

3. Transversus abdominis

4. External oblique

The correct answer is: Rectus abdominis

The rectus abdominis is a key muscle that runs vertically along the front of the abdomen, extending from the thorax to the pubis. This muscle is part of the abdominal wall and plays a crucial role in flexing the vertebral column, stabilizing the pelvis, and supporting posture. It is commonly referred to as the "six-pack" muscle due to its segmented appearance, which is particularly visible in well-conditioned individuals. The design of the rectus abdominis allows it to effectively control movements of the trunk, contributing to activities like bending forward and lifting. In contrast, other muscles mentioned in the options serve different functions or are oriented differently. For example, the quadratus lumborum is located in the lower back and aids in stabilizing the spine rather than extending to the pubis. The transversus abdominis is a deeper abdominal muscle that provides stability and support but does not span from the thorax to the pubis. The external oblique, while also part of the abdominal wall, runs diagonally downwards and contributes to twisting movements, without spanning the same vertical distance as the rectus abdominis.