the reflection pulleys.

It forms the support that gives the diaphragm its shape. A pulley by digitation.
With this film I show the way in which the complementary contractions of the diaphragmatic intercostal couple are organized, and their connection with the anatomical pillars. This leads to a thoracic deployment.

 For the fixing of the pulleys it is necessary to have two complementary clevises, which introduces the presence of two complementary centres. An intra-abdominal centre and an intra- thoracic centre.

 I'm showing all four sides of a thorax with non-uniform mobility. If, on inspiration in the posterior plane, the ribs rise instead of spreading out, the axis of the pulleys moves away, which moves the bisector. Under these conditions the horizontal part of the diaphragm widens for the digitations concerned at the expense of the rising parts. 

 With a flat chest at expiration, one can have a straightening of the back associated with an approximation of the antero-posterior digitations. This leads to an increase in the rising parts at the expense of the horizontal parts. This symmetry is not obligatory, In this case the pressure shift changes the orientation of the anatomical abutments.

 The digitations can also be seen in plan view, which makes it possible to observe the mobility of the neck angle.

  You can see with a flat and thick chest the orientation of the abdominal bundles, according to the displacement of the pulley axis. Their organization gives us the functional expiratory functional pillar oriented either forwards or backwards depending on the inspiratory exhaust.

 To understand the diaphragm the author uses two instruments that you know well, the parachute for the vision of the digitations, and the umbrella for the opening and closing of the digitations. In a uniform system it is sufficient to invert two umbrellas.
The parachutist shows you how he moves the vertical by pulling on a shroud.
The diaphragm can do the same with his digitations and even rotate the chest.
The umbrella shows you that a uniform system requires a double-orientated slider so two intra thoracic umbrellas. In combination with two intra-abdominal umbrellas you can combine the spine, thorax and pelvis in one function.