Innermost intercostal muscle

From WikiMD's Wellness Encyclopedia
Innermost Intercostal Muscle
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Section of the thorax showing the arrangement of the intercostal muscles.
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The relations of the viscera and large vessels of the thorax (seen from behind).
Details
OriginInferior border of the rib above
InsertionSuperior border of the rib below
ArteryIntercostal arteries
NerveIntercostal nerves
ActionsDepresses ribs
Identifiers
LatinMusculus intercostalis intimus
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Anatomical terminology
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The Innermost Intercostal Muscle (Musculus intercostalis intimus) is a layer of muscle between the ribs (intercostal) that is the deepest of the three layers of intercostal muscles.

Anatomy[edit | edit source]

The innermost intercostal muscles are found between the ribs and are the deepest layer of the intercostal muscles. They originate from the inferior border of the rib above and insert into the superior border of the rib below. The fibers of the innermost intercostal muscles run in the same direction as those of the internal intercostal muscles.

Section of the thorax showing the arrangement of the intercostal muscles.

Function[edit | edit source]

The primary function of the innermost intercostal muscles is to depress the ribs, which decreases the transverse dimensions of the thoracic cavity during forced expiration.

Clinical significance[edit | edit source]

Damage to the innermost intercostal muscles can result in difficulty breathing and pain during respiration.

See also[edit | edit source]

References[edit | edit source]

Contributors: Prab R. Tumpati, MD