reinterpretations of the ankh symbol part 2 - Asar Imhotep
reinterpretations of the ankh symbol part 2 - Asar Imhotep
reinterpretations of the ankh symbol part 2 - Asar Imhotep
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8<br />
Looking at <strong>the</strong> thorax through a cross section, we notice that <strong>the</strong> loop is almost kidney shaped. To<br />
get a greater appreciation <strong>of</strong> <strong>the</strong> thorax, we must examine <strong>the</strong> thoracic wall. The thoracic wall is<br />
made up <strong>of</strong> <strong>the</strong> sternum, ribs plus three layers <strong>of</strong> intercostal muscles, diaphragm and <strong>the</strong> intercostal<br />
vessels and nerves.<br />
MUSCLES OF THE THORACIC WALL<br />
The muscles <strong>of</strong> <strong>the</strong> thorax consist <strong>of</strong> <strong>the</strong> intercostals and diaphragm (ntnt). The intercostal muscles<br />
are arranged as three layers between <strong>the</strong> ribs: external layer, internal layer and an incomplete<br />
innermost layer. The diaphragm closes <strong>the</strong> thoracic outlet and separates <strong>the</strong> thoracic cavity from<br />
<strong>the</strong> abdominal cavity. The three layers <strong>of</strong> <strong>the</strong> intercostal muscles are:<br />
� external layer -- external intercostal<br />
� internal layer -- internal intercostal<br />
� innermost layer -- transversus thoracic (anterior), innermost (lateral) and subcostal<br />
(posterior)<br />
The most important muscle <strong>of</strong> <strong>the</strong> thoracic wall is <strong>the</strong> diaphragm. During normal respiration, this<br />
muscle is <strong>the</strong> primary component. The diaphragm pulls air down into your lungs. As you can see in<br />
<strong>the</strong> images below, <strong>the</strong> innermost layer is split into three differently named muscle groups. The<br />
transversus thoracis, innermost intercostal and subcostal muscles make up <strong>the</strong> deepest layer <strong>of</strong><br />
muscles from anterior to posterior, respectively.