📖 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.
Biceps Femoris — Long Head
Lateral hamstring, long head. Two-joint muscle crossing both hip and knee. Shares conjoint tendon with semitendinosus at ischial tuberosity.
Draft95%
Anatomy
- Origin
- Ischial tuberosity (conjoint tendon with semitendinosus)
- Insertion
- Head of fibula, lateral tibial condyle
- Action
- Knee flexion, hip extension, knee external rotation
- Innervation
- Tibial division of sciatic nerve (L5-S2); typically 1-2 branches
- Blood Supply
- Perforating branches of profunda femoris artery
Movements (3)
| Movement | Joint | Role | Notes |
|---|---|---|---|
| Hip Extension | Hip Joint (Coxofemoral) | Primary | — |
| Knee Flexion | Tibiofemoral Joint | Primary | — |
| Knee External Rotation | Tibiofemoral Joint | Primary | Moment arm at 30° flexion: 18.5-31.5 mm |
Exercises (11)
| Exercise | Role |
|---|---|
| Romanian Deadlift | Primary |
| Nordic Hamstring Curl | Primary |
| Leg Curl | Primary |
| Towel Hamstring Curl | Synergist |
| Wall Hamstring Stretch | lengthening |
| Leg Extension | lengthening |
| Seated Knee Extension (Bodyweight) | lengthening |
| Standing Hamstring Stretch (Foot on Step) | lengthening |
| Supine Hamstring Stretch (Strap-Assisted) | lengthening |
| Hip Flexor and Hamstring Stretching | lengthening |
| Straight Leg Raise | lengthening |
Sources
- Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Anatomy of Biceps Femoris — Long Head — origin, insertion, action, innervation
- Muscles: Testing and Function with Posture and Pain — Manual muscle testing for Biceps Femoris — Long Head