📖 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.
Flexor Pollicis Longus
Deep anterior forearm muscle. Only flexor of the thumb IP joint.
Draft95%
Anatomy
- Origin
- Anterior surface of radius, interosseous membrane
- Insertion
- Base of distal phalanx of thumb
- Action
- Flexion of thumb IP joint, assists thumb MCP flexion
- Innervation
- Anterior interosseous nerve (C7, C8)
- Blood Supply
- Anterior interosseous artery
Movements (3)
| Movement | Joint | Role | Notes |
|---|---|---|---|
| Finger Flexion (DIP) | Distal Interphalangeal Joints | Primary | DIP flexion of thumb — FPL is the only flexor |
| Thumb Flexion (IP) | Thumb Interphalangeal Joint | Primary | Only flexor of thumb IP |
| Thumb Flexion (MCP) | Thumb Metacarpophalangeal Joint | Secondary | Also crosses MCP |
Exercises (5)
| Exercise | Role |
|---|---|
| Thumb IP and MCP Strengthening | Primary |
| Thumb Adduction / Key Pinch Exercise | Secondary |
| Thumb Opposition Sequence | Secondary |
| Pinch Strengthening (Tip / Three-Jaw-Chuck / Lateral) | Secondary |
| Grip Squeeze and Release | Secondary |
Sources
- Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Anatomy of Flexor Pollicis Longus — origin, insertion, action, innervation
- Muscles: Testing and Function with Posture and Pain — Manual muscle testing for Flexor Pollicis Longus