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The Muscular System (Interactions of Skeletal Muscles in the Body…
The Muscular System
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Axial Muscles of the Head, Neck, and Back
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Axial Muscles of the Abdominal Wall, and Thorax
Muscles of the Abdomen
The external oblique, closest to the surface, extend inferiorly and medially, in the direction of sliding one’s four fingers into pants pockets.
Perpendicular to it is the intermediate internal oblique, extending superiorly and medially, the direction the thumbs usually go when the other fingers are in the pants pocket.
The deep muscle, the transversus abdominis, is arranged transversely around the abdomen, similar to the front of a belt on a pair of pants
The linea alba is a white, fibrous band that is made of the bilateral rectus sheaths that join at the anterior midline of the body.
These enclose the rectus abdominis muscles (a pair of long, linear muscles, commonly called the “sit-up” muscles) that originate at the pubic crest and symphysis, and extend the length of the body’s trunk
Each muscle is segmented by three transverse bands of collagen fibers called the tendinous intersections
Muscles of the Thorax
When the abdominal muscles contract, the pressure cannot push the diaphragm up, so it increases pressure on the intestinal tract (defecation), urinary tract (urination), or reproductive tract (childbirth).
The inferior vena cava passes through the caval opening, and the esophagus and attached nerves pass through the esophageal hiatus.
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