📖 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.
Upper Cervical Flexion
Atlantooccipital Joint • Cervical Spine • sagittal plane
Nodding motion — chin tuck. Flexion at the atlantooccipital joint.
Axis: medial-lateral
Normal Range of Motion
Atlantooccipital (upper cervical) flexion is not measured by standard clinical goniometry and has no AAOS/Norkin & White reference value, so set to null. Biomechanical estimates place O-C1 flexion at only a few degrees (combined O-C1 flexion/extension roughly 15-25 deg); not a clinically measured goniometric normal.
Source: AAOS/Norkin & White (no isolated value); segmental estimate from White & Panjabi Clinical Biomechanics of the Spine
Muscles (2)
| Muscle | Role | Notes |
|---|---|---|
| Deep Cervical Flexors | Primary | Longus capitis: 11.1% CSA increase at C0-C1; longus colli: 17.4% at C2-C3 |
| Sternocleidomastoid | Synergist | Assists upper cervical flexion when DCFs active |
Functional Tasks (1)
Exercises (8)
Sources
- Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Biomechanics of Upper Cervical Flexion