Intercostal muscles are located between the ribs and are involved in the expansion and contraction of the chest during breathing. There are three layers of intercostal muscles: external, internal, and innermost. These muscles play a crucial role in breathing mechanics and help stabilise the chest wall.
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Intercostal Muscles PPT Summary
- The intercostal muscles are arranged in three layers – external, internal, and transverse thoracic group.
- The external intercostal muscles elevate the ribs, increasing thoracic volume.
- The internal intercostal muscles reduce thoracic volume by depressing the ribcage.
- The subcostalis, innermost intercostals, and transversus thoracis group are important muscles in the thoracic cage.
- The sternalis muscle expands from the sternocleidomastoid to the rectus abdominis along the sternum.
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