The rectus abdominis is a Parallel muscle, while the rectus femoris is a bipennate muscle.
<h3>Rectus abdominis</h3>
The long muscle of the anterior abdominal wall is the rectus abdominis, most commonly referred to as the "abs muscle." It is readily apparent beneath the skin, forming the "six pack," in people with low body fat. It reaches all the way to the pubic bone from the rib cage. Together with the pyramidalis muscle, the rectus abdominis is a member of the anterior abdominal muscles. However, when considering the functional architecture, these two muscles together with the three lateral abdominal muscles—the external oblique, internal oblique, and transversus abdominis—make up the anterolateral abdominal wall. The rectus sheath, which is made up of the aponeuroses of the lateral abdominal muscles, surrounds and protects the rectus abdominis muscle. The linea semilunaris is the outside, most lateral line defining the rectus.
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