--- a
+++ b/Docs/body/thoracic_model.md
@@ -0,0 +1,91 @@
+(thoracic-model)=
+
+# Thoracic spine model
+
+:::{admonition} **Unreleased model:** 
+:class: caution
+The model is under development and not yet included in the managed model repository.
+The model is used in various research projects and access to the model can be given on request. Please
+[contact us](mailto:sales@anybodytech.com) if you are interested in this work.
+:::
+
+
+```{image} _static/Detailed-thorax.png
+```
+
+The thoracic spine model consists of the thoracic vertebral column and the
+ribcage, including individual ribs and a two part sternum. The many segments interconnected by joints
+replicates the physiological connection and load transfer mechanisms.
+
+
+
+## Kinematics and spine rhythms 
+
+The thoracic vertebral column contains 12 vertebrae with 3 DoF spherical joints
+in between each 2 vertebrae, connecting to the cervical spine through a
+spherical joint at T1C7 levels, and a spherical joint to the lumbar spine at
+T12L1 levels. Costovertebral and sternocostal joint are also represented through
+kinematic joints. All vertebra are linked with rhythm drivers to allow easy use. 
+
+
+```{raw} html
+<video width="100%" style="display:block; margin: 0 auto;" controls autoplay loop>
+    <source src="../_static/rhythms.mp4" type="video/mp4">
+Your browser does not support the video tag.
+</video>
+```
+
+## Muscles configurations
+
+The majority of the muscle fascicles are defined for the thoracic column, ribcage region 
+as well as a diaphragm muscles to simulatate breathing and abdominal volume pressure. 
+
+
+```{image} _static/Detailed-thorax2.png
+```
+
+
+% .. image:: _static/thoracic.png
+
+% :width: 100%
+
+## Example Configuration
+
+The detailed thoracic model can be controlled using the `BM_*` statements like the rest of the body models. 
+
+
+```{code-block} AnyScriptDoc
+:emphasize-lines: 3
+
+  #define BM_TRUNK_THORACIC_MODEL _THORACIC_MODEL_FLEXIBLE_   //Enables the detailed thoracic model
+
+  #define BM_TRUNK_CAVITY_MODEL _CAVITY_MODEL_VOLUME_  //Enables the new abdominal volume model
+
+```
+
+
+```{rst-class} without-title
+```
+
+:::{note}
+**Planned for AMMR 4.0:** The model is scheduled to be released together with AMMR 4.0, but is available on GitHub at https://github.com/anybody/ammr.
+Otherwise, for early access please [contact us](mailto:sales@anybodytech.com).
+:::
+
+
+
+% .. rst-class:: float-right
+
+% .. seealso::
+
+% The :doc:`Trunk configuration parameters <../bm_config/trunk>` for a
+
+% full list of Trunk parmaeters.
+
+## References
+
+- Ignasiak, D., Dendorfer, S., Fergusson, S.J. (2016), "Thoracolumbar spine model with
+  articulated ribcage for the prediction of dynamic spinal loading",
+  Journal of Biomechanics, vol. 49 (6), pp. 959-966.
+- Shayestehpour, H., Toerholm, S.,  Lund, M.E., Rasmussen, J. (To be submitted), "A generic detailed multibody thoracic spine and ribcage model."
+  Journal of Multibody system dynamics.
\ No newline at end of file