During cranial flexion, what happens to the sphenoid and the sacrum?

During cranial flexion, the primary movements involve the relationship between the sphenoid bone and the sacrum. As flexion occurs, the sphenoid moves in a manner that is often described as "rising," which is indicative of the anterior aspect of the sphenoid being elevated. This movement is crucial as it reflects the flexion pattern throughout the cranial vault.

Simultaneously, the sacrum undergoes a counter-nutation motion. In this context, counter-nutation is defined as a backward and upward movement of the sacrum relative to the ilia, which corresponds with the cranial flexion mechanism. This coordinated movement between the cranial and sacral areas plays an integral role in the overall cranial mechanics during this cycle.

Cranial flexion is part of the primary respiratory mechanism, which involves the rhythmic expansion and contraction of the cranial bones, sutures, and the sacral base. Recognizing this relationship is vital for understanding the dynamics of craniosacral motion in osteopathy and its implications for patients, particularly in addressing cranial-related dysfunctions.