Intercostal muscles are several groups of muscles that run between the ribs, and help form and move the chest wall.There are three principal layers; the external intercostal muscles, which aid in quiet and forced inhalation. They originate on ribs 1-11 and have their insertion on ribs 2-12. The external intercostals are responsible for the elevation of the ribs, and expanding the transverse dimensions of the thoracic cavity. Located around the the ribsthe internal intercostal muscles, which aid in forced expiration (quiet expiration is a passive process). They originate on ribs 1-11 and have their insertions on ribs 2-12. The internal intercostals are responsible for the depression of the ribs decreasing the transverse dimensions of the thoracic cavity.the innermost intercostal muscle See more at Wikipedia.org...
Internal intercostal muscle n. Any of the muscles with their origin from the lower border of a rib, with insertion into the upper border of the rib [more]Intercostal muscle - Community and Resources
Noun 1. muscles between the ribs; they contract during inspiration (synonym) intercostal, musculus intercostalis (hypernym) skeletal muscle, striated muscle
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