📖 Static demo — read-only snapshot
You’re browsing a static build of the Body IQ knowledge graph, so everything loads with no backend. A few things that need the live server are turned off here:
- Global search (sidebar) is disabled — it queries the API.
- The JSON API and the API “Try it” playgroundaren’t included.
- The data is a snapshot — it refreshes only when the demo is rebuilt, not live from the database.
Everything else — the body map, progression ladders, coverage heatmap, exercise finder, and all anatomy/exercise/source pages — works fully. The full app (live search + API + database) runs from the source on GitHub.
Internal Intercostals
Complex respiratory muscles with dual function. Interosseous portions are expiratory; parasternal (intercartilaginous) portions are inspiratory. Fibers run inferoposteriorly.
Draft95%
Anatomy
- Origin
- Superior border and costal groove of rib below (from sternum to angle of rib)
- Insertion
- Inferior border of rib above
- Action
- Interosseous portions: expiratory (caudal interspaces); Parasternal portions: inspiratory; action depends on rib cage volume and interspace location
- Innervation
- Intercostal nerves (T1-T11)
- Blood Supply
- Posterior and anterior intercostal arteries
Movements (1)
| Movement | Joint | Role | Notes |
|---|---|---|---|
| Thoracic Flexion | Thoracic Intervertebral Joints | Synergist | Rib depression during expiration; assists trunk flexion |
Exercises (1)
| Exercise | Role |
|---|---|
| Lateral Costal Breathing | Synergist |
Sources
- Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Anatomy of Internal Intercostals — origin, insertion, action, innervation
- Muscles: Testing and Function with Posture and Pain — Manual muscle testing for Internal Intercostals