During cranial flexion, what happens to the vertical diameter?

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Prepare for the OMM 6 Cranial Evaluation and Treatment Test. Use flashcards and multiple-choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

During cranial flexion, what happens to the vertical diameter?

Explanation:
Cranial flexion shortens the skull in the vertical direction. In flexion, the sphenoid and occiput move closer and the SBS rises toward the vertex, causing the vault to compress along the vertical axis. As a result, the vertical diameter (the height from the vertex toward the base) decreases. In contrast, extension lengthens this vertical dimension, while flexion commonly broadens the skull transversely. This is why the correct description is that the vertical diameter decreases during cranial flexion.

Cranial flexion shortens the skull in the vertical direction. In flexion, the sphenoid and occiput move closer and the SBS rises toward the vertex, causing the vault to compress along the vertical axis. As a result, the vertical diameter (the height from the vertex toward the base) decreases. In contrast, extension lengthens this vertical dimension, while flexion commonly broadens the skull transversely. This is why the correct description is that the vertical diameter decreases during cranial flexion.

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