Intercostalis Externi
Origin
Rip
Projection
next rip
Function
Inhalation
Innervation
Nervi intercostales (Spinalnerven des Brustteils des Rückenmarks)
Spinal Segments
Th1–Th11
The Musculi intercostales externi form together with the rips and the underling Musculi intercostales interni the chest wall. The contraction der Musculi intercostales externi lifts the rips and broadens the rip cage, so these muscles aid the Inhalation (Inspiration) („ helping inspirator“) and are considered part of the respiratory muscles.