The accessory expiratory muscles that assist in active exhalations are
Rectus abdominis at the front of the pelvis, hanging between the ribs and the pubic bone.
One of the most important abdominal muscles, the external oblique muscle wraps around and descends to the pelvis from the lower half of the ribs.
On the outside of the abdomen, there is a muscle called the internal abdominal oblique.
In the internal oblique muscle's near vicinity in the abdomen is the transverse abdominis.
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