📖 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.
Semispinalis Thoracis
Deep posterior thoracic muscle spanning 5-7 segments. Extends thoracic and lower cervical spine. Contralateral rotator.
Draft95%
Anatomy
- Origin
- Transverse processes of T6-T12
- Insertion
- Spinous processes of C6-T4
- Action
- Bilateral: thoracic and cervical extension; Unilateral: contralateral rotation
- Innervation
- Medial branches of posterior rami of thoracic spinal nerves
- Blood Supply
- Posterior intercostal arteries, deep cervical artery (upper portions)
Movements (2)
| Movement | Joint | Role | Notes |
|---|---|---|---|
| Thoracic Rotation | Thoracic Intervertebral Joints | Secondary | Contralateral rotation |
| Thoracic Extension | Thoracic Intervertebral Joints | Secondary | — |
Exercises (3)
| Exercise | Role |
|---|---|
| Cobra Pose | Secondary |
| Seated Trunk Rotation | Secondary |
| Superman | Synergist |
Sources
- Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Anatomy of Semispinalis Thoracis — origin, insertion, action, innervation
- Muscles: Testing and Function with Posture and Pain — Manual muscle testing for Semispinalis Thoracis