📖 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 Longus
Deep posterior forearm muscle. Extends the thumb IP and MCP joints.
Draft95%
Anatomy
- Origin
- Middle third of posterior ulna, interosseous membrane
- Insertion
- Base of distal phalanx of thumb
- Action
- Extension of thumb IP and MCP joints, assists wrist extension and thumb adduction
- Innervation
- Posterior interosseous nerve (C7, C8)
- Blood Supply
- Posterior interosseous artery
Movements (2)
| Movement | Joint | Role | Notes |
|---|---|---|---|
| Thumb Extension (MCP) | Thumb Metacarpophalangeal Joint | Primary | — |
| Thumb Extension (IP) | Thumb Interphalangeal Joint | Primary | — |
Exercises (1)
| Exercise | Role |
|---|---|
| Thumb IP and MCP Strengthening | Primary |
Sources
- Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Anatomy of Extensor Pollicis Longus — origin, insertion, action, innervation
- Muscles: Testing and Function with Posture and Pain — Manual muscle testing for Extensor Pollicis Longus