The
muscular system of the lower abdomen, including the pelvis, is separated from
that of the chest by the muscular wall of the diaphragm - so critical to breathing
- and lies somewhat exposed between the protective bones of the ribs above
and the pelvic girdle behind. As such, skeletal muscles across the lower
abdomen play a critical role in protecting the delicate organs within the abdomen,
in addition to providing propulsion and stability.
Attached
to the pelvis are muscles of the abdominal wall, the buttocks, the lower
back, and the insides and backs of the thighs. This includes the
gluteus maximus
and the rest of the posterior thigh muscles that connect
the lower abdomen with the legs in support of the body's weight and in its propulsion.
the lower abdomen with the legs in support of the body's weight and in its propulsion.
Other
abdominal muscles serve as flexors of the trunk on the hip as well as of the
thigh at the hip joint, or rotate the hip and thigh together.
Inner
organs within the abdominal cavity are also part of the muscular system.
For one, the uterus or wombs a hollow muscular organ that forces the baby
through the birth canal with great force. The bladder too and intestines are
hollow muscular organs of the digestive and excretory systems, located within
the abdomen.
Protecting
those vital organs, the specific muscles commonly referred to as the
abdominal muscles also aid in locomotion but are more critical to the body's
stability, working in conjunction with the muscles of the lower back. Broad
and flat, they flex, bend the vertebral column sideways, and rotate it while
assisting in the digestive process and in forced expiration.
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