📖 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.
Extensor Pollicis Brevis
Deep posterior forearm muscle. Extends thumb MCP and CMC joints. Part of the first dorsal compartment with APL (de Quervain's).
Draft95%
Anatomy
- Origin
- Posterior radius and interosseous membrane
- Insertion
- Dorsal base of proximal phalanx of thumb
- Action
- Extension of thumb MCP and CMC joints, mild abduction
- Innervation
- Posterior interosseous nerve (C7-C8)
- Blood Supply
- Posterior interosseous artery
Movements (1)
| Movement | Joint | Role | Notes |
|---|---|---|---|
| Thumb Extension (MCP) | Thumb Metacarpophalangeal Joint | Primary | Extends thumb at MCP joint |
Exercises (2)
| Exercise | Role |
|---|---|
| Thumb Radial Abduction | Secondary |
| Radial Deviation Strengthening | Secondary |
Sources
- Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Anatomy of Extensor Pollicis Brevis — origin, insertion, action, innervation
- Muscles: Testing and Function with Posture and Pain — Manual muscle testing for Extensor Pollicis Brevis