Sidebending Rotation

According to Sutherland, the sidebending rotation is a physiological movement of the SBS as well. In this movement, the sphenoidal bone bends sideways toward the occiput-on one side-and both bones rotate together to the same side. This movement is named according to the side, in which the greater wing is low, for example, sidebending rotation left or sidebending rotation right (Figs. 4.9,4.10).

Because of the sidebending, the sphenoid and occiput move closer together on the right side. The leftward rotation causes the sphenoidal body and basilar part to incline to the left. As a result, the top of the skull takes on a characteristic shape.

While the right side of the cranial girth is shorter and straighter, the left side becomes longer and rounder. Due to the sidebending of the SBS, "the joint opens up on the left," which affects the position of the occiput over the atlas.

On the left side, the occiput slides backward. On the right side, it is pulled forward by the sidebending. Hence, the occiput stands in a left rotation and right sidebending over the atlas (which restores the horizontal position).

The drop of the SBS on the left side is compensated by the right sidebending of the occiput. The peripheral cranial bones adapt as follows:

• Basilar part low on the left: left temporal in external rotation = back left cranial quadrant in external rotation

• Basilar part high on the right: right temporal in internal rotation = back right quadrant in internal rotation

• Greater wing low on the left = left right quadrant in internal rotation

• Greater wing high on the right = right front quadrant in external rotation

As the cranial bones are forced to adjust in order to harmonize, the spinal column and rest of the organism are forced to do likewise. The left rotation-right sidebending of the occiput over the atlas affects the OAA complex and the spinal dura mater as much as the lumbosacral junction. The occiput posterior on the left corresponds to an occiput in extension position on a craniosacral level.

Atlas Sidebending

Fig. 4.9a, b Sidebending rotation to the right.

Cranial Sidebending Rotation

Fig. 4.9a, b Sidebending rotation to the right.

Spinal Rotation
Fig. 4.10 Sidebending rotation to the left and effect on the spinal column and pelvis.

The dural tube is relaxed on the left side, as a result of which the base of the sacrum can drop forward and down on the left. On the right, the occiput is anterior, that is, in flexion position from a craniosacral viewpoint. The dural tube is tensed and the base of the cranium is kept cranial-posterior. The sacrum makes a rotation to the right. This corresponds to the rightward rotation of the occiput and sphenoid in a sidebending rotation to the left.

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  • timothy
    What is sidebending of sphenoid?
    4 years ago

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