Anatomy
Origin:
Inferior margin of the rib above i.e. ribs 1 to 11.
Insertion:
Superior surface of the rib below i.e. ribs 2 to 12.
Key relations:
-Muscle fibres run obliquely anteroinferiorly.
-Most superficial intercostal muscle.
Functions
-Moves ribs superiorly during inspiration, thereby expanding the thoracic cavity.
-Maintains intercostals spaces during inspiration and expiration.
Supply
Nerve Supply:
Intercostal nerves T1 to 11.
Blood Supply:
Intercostal arteries.
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