The abdomen

There are three muscular layers of the abdominal wall,

with a fourth layer in the middle anterior region.

The fourth layer in the midregion is the rectus abdominis,

which has vertically running muscle fibres that flex the

trunk and stabilize the pelvis. To either side of the rectus abdominis

are the other three layers of abdominal muscles. The deepest

of those layers is the transversus abdominis, which has fibres t

hat run perpendicular to the rectus abdominus; the transversus

abdominis acts to compress and support the abdomen

and provides static core stabilization. The internal oblique

layers run upward and forward from the sides of the abdomen,

and the external oblique layers, which form the outermost muscle

layers of the abdomen, run downward and forward. The internal

oblique layers act in conjunction with the external oblique

on the opposite side of the body to flex and rotate the trunk toward

the side of the contracting internal oblique (“same-side rotator”).

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