Muscles / Core
Internal intercostals
- Core
- Thorax & breathing
- Intermediate layer
Anatomy
- Origin
- Inferior border of each rib (costal groove region)
- Insertion
- Superior border of the rib below (fibres run inferoposteriorly)
- Nerve
- Intercostal nerves (T1-T11)
Actions
- Interosseous part depresses the ribs during forced expiration
- Interchondral part elevates the ribs
References (4)
- Standring S, ed. Elsevier. Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd ed.
- Dalley AF, Agur AMR. Wolters Kluwer. Moore's Clinically Oriented Anatomy. 9th ed.
- Neumann DA. Elsevier. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed.
- Betts JG, Young KA, Wise JA, et al. OpenStax (free, openly licensed textbook). Anatomy and Physiology 2e