📖 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.
Quadratus Lumborum
Deep posterior abdominal wall muscle. Lateral flexor and rib stabilizer. Biomechanical studies show it contributes less than 10% of extensor and lateral bending moments compared to erector spinae and multifidus.
Draft95%
Anatomy
- Origin
- Iliac crest, iliolumbar ligament
- Insertion
- 12th rib, transverse processes of L1-L4
- Action
- Lateral flexion, 12th rib stabilization during inspiration; modest direct action on lumbar spine (<10% of extensor/lateral bending moments)
- Innervation
- Ventral rami of T12-L4, with motor neurons in both ventromedial and lateromedial nuclei
- Blood Supply
- Lumbar arteries, subcostal artery, iliolumbar artery
Movements (2)
| Movement | Joint | Role | Notes |
|---|---|---|---|
| Lumbar Lateral Flexion | Lumbar Intervertebral Joints | Primary | — |
| Lumbar Extension | Lumbar Intervertebral Joints | Secondary | <10% of extensor moment [Phillips 2008] |
Exercises (31)
Sources
- Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Anatomy of Quadratus Lumborum — origin, insertion, action, innervation
- Muscles: Testing and Function with Posture and Pain — Manual muscle testing for Quadratus Lumborum