📖 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 Brevis
Thenar muscle that flexes the thumb at the MCP joint.
Draft95%
Anatomy
- Origin
- Superficial head: flexor retinaculum, trapezium; Deep head: trapezoid, capitate
- Insertion
- Lateral side of proximal phalanx of thumb via lateral sesamoid
- Action
- Flexion of thumb MCP joint, assists opposition
- Innervation
- Superficial head: median nerve (C8, T1); Deep head: ulnar nerve (C8, T1)
- Blood Supply
- Superficial palmar branch of radial artery
Movements (2)
| Movement | Joint | Role | Notes |
|---|---|---|---|
| Thumb Flexion (MCP) | Thumb Metacarpophalangeal Joint | Primary | — |
| Thumb Opposition | First Carpometacarpal Joint | Synergist | MCP flexion component |
Exercises (7)
| Exercise | Role |
|---|---|
| Thumb Opposition Sequence | Primary |
| Thumb IP and MCP Strengthening | Primary |
| Pinch Strengthening (Tip / Three-Jaw-Chuck / Lateral) | Primary |
| Thumb Opposition Exercise | Primary |
| Comprehensive Thumb Putty Program | Secondary |
| Grip Squeeze and Release | Secondary |
| Thumb Adduction / Key Pinch Exercise | Synergist |
Sources
- Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Anatomy of Flexor Pollicis Brevis — origin, insertion, action, innervation
- Muscles: Testing and Function with Posture and Pain — Manual muscle testing for Flexor Pollicis Brevis