The only movable bone in the skull is the mandible that forms the lower jaw.

Explanation

### Step-by-Step Text Solution:

1. **Understanding the Skull Structure**: The human skull is composed of a total of 22 bones. These bones are categorized into two main regions: the head region and the face region.

2. **Classification of Skull Bones**: Out of the 22 bones, 8 are found in the head region (which includes the cranial bones) and 14 are found in the face region (which includes facial bones).

3. **Identifying the Movable Bone**: Among all these bones, the mandible is the only bone that is movable. It forms the lower jaw.

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