Abdominal Muscles: Difference between revisions
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= 1. | = 1. Introduction = | ||
The abdominal muscles form the anterior and lateral abdominal wall and consist of the external abdominal obliques, the internal abdominal obliques, the rectus abdominis and the transversus abdominus . Their function is to protet the viscera, to help maintain posture and to compress the abdominal contents , thus raising intra-abdominal pressure such as in sneezing, coughing, micturating, defecating, lifting and childbirth. | = <span class="Apple-style-span" style="font-size: 13px; ">The abdominal muscles form the anterior and lateral abdominal wall and consist of the external abdominal obliques, the internal abdominal obliques, the rectus abdominis and the transversus abdominus . Their function is to protet the viscera, to help maintain posture and to compress the abdominal contents , thus raising intra-abdominal pressure such as in sneezing, coughing, micturating, defecating, lifting and childbirth. </span> = | ||
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= 2. External Abdominal Oblique = | |||
= 2. | == 2.1 Structure == | ||
The external abdominal oblique muscle is the largest and most superficial of the four muscles and lies on the sides and front of the abdomen. It is broad and thin with it's muscular portion occupying the side and it's aponeurosis the anterior wall of the abdomen. It arises fromt he external surface and inferior borders of the lower eight ribs. The fibres from the lowest ribs pass nearly vertically downward and are inserted into the anterior half of the iliac crest, the middle and upper fibres, directed inferiorly and anteriorly, end in an aponeurosis at approximately the mid-clavicular lineand insert into the xiphoid process, the linea alba, the pubic crest and the pubic tubercle. | |||
== 2.2 Innervation == | |||
== 2.3 Function == | |||
Both sides acting together, the external abdominal oblique flex's the vertebral column by drawing the pubis toward the xiphoid process. Acting unilaterally it results in ipsilateral side flexion and contralateral rotation of the trunk. | |||
Revision as of 10:38, 20 June 2014
1. Introduction[edit | edit source]
The abdominal muscles form the anterior and lateral abdominal wall and consist of the external abdominal obliques, the internal abdominal obliques, the rectus abdominis and the transversus abdominus . Their function is to protet the viscera, to help maintain posture and to compress the abdominal contents , thus raising intra-abdominal pressure such as in sneezing, coughing, micturating, defecating, lifting and childbirth. [edit | edit source]
2. External Abdominal Oblique [edit | edit source]
2.1 Structure [edit | edit source]
The external abdominal oblique muscle is the largest and most superficial of the four muscles and lies on the sides and front of the abdomen. It is broad and thin with it's muscular portion occupying the side and it's aponeurosis the anterior wall of the abdomen. It arises fromt he external surface and inferior borders of the lower eight ribs. The fibres from the lowest ribs pass nearly vertically downward and are inserted into the anterior half of the iliac crest, the middle and upper fibres, directed inferiorly and anteriorly, end in an aponeurosis at approximately the mid-clavicular lineand insert into the xiphoid process, the linea alba, the pubic crest and the pubic tubercle.
2.2 Innervation[edit | edit source]
2.3 Function[edit | edit source]
Both sides acting together, the external abdominal oblique flex's the vertebral column by drawing the pubis toward the xiphoid process. Acting unilaterally it results in ipsilateral side flexion and contralateral rotation of the trunk.
