Intercostal Muscle Anatomy

Intercostal Muscles

Origin: From the first to the eleventh ribs, on the inner surface and inferior border, from the tubercles of the rib posteriorly to the costocartilage anteriorly
Insertion: The rib immediately below the level of proximal attachment, on its superior surface
Actions: Elevation of the ribs during respiration
Innervation: Intercostal nerves, ventral rami of T1 through T11
Blood Supply: Intercostals arteries

Primary Actions of the Intercostal Muscles

1. Elevation of the ribs during respiration