The term "crown bone" is not a recognized anatomical term. The "crown" most likely refers to the top of the skull, and the bones that form this area. These bones include the frontal and parietal bones.
Bones Forming the "Crown" of the Skull
The upper part of the skull, often referred to informally as the "crown," is composed primarily of the following bones:
- Frontal Bone: This bone forms the forehead and the upper part of the eye sockets. It extends backward to meet the parietal bones.
- Parietal Bones: There are two parietal bones, located on each side of the skull, behind the frontal bone. They form a large part of the cranial vault (the upper part of the skull that encloses the brain).
Sutures Connecting the Bones
These bones are connected by sutures, which are fibrous joints that allow for slight movement during growth but become fused in adulthood. The relevant sutures in this area are:
- Coronal Suture: This suture connects the frontal bone to the parietal bones.
- Sagittal Suture: This suture connects the two parietal bones to each other along the midline of the skull.
Thickness and Variations
The thickness of the cranial bones in the "crown" area typically ranges from 4 to 7 millimeters (0.16 to 0.28 inches) and can vary considerably between individuals. The thickness also tends to increase with age.
Therefore, while there's no officially defined "crown bone," the term likely alludes to the frontal and parietal bones that form the upper part, or crown, of the skull.
