![]() ![]() These small bones are called sutural bones. Sometimes, additional small bones can develop between sutured bones of the cranium along the suture lines. ![]() The bones of the cranium are connected together through joints called sutures, which look like they are stitched. The maxillae also contain paranasal sinuses like the frontal, ethmoid, and sphenoid bones of the cranium. The bones of the cranium are the part of the skull that encapsulates the brain. The lower teeth are rooted into the mandible while the upper teeth are rooted in the two maxillae. The mandible, or jaw bone, is the only movable bone of the skull, forming the temporomandibular joint with the temporal bone. The 14 bones that support the muscles and organs of the face are collectively known as our facial bones. The sinuses help to reduce the weight of these bones and increase the resonance of the voice during speech, singing, and humming. The frontal, ethmoid, and sphenoid bones contain small hollow spaces known as paranasal sinuses. The occipital bone also forms the atlanto-occipital joint with the atlas (the first cervical vertebra in our spine). Our occipital bone contains the foramen magnum, the hole through which the spinal cord enters the skull to attach to the brain. In this region we have eight cranial bones:Ĭollectively, these bones provide a solid bony wall around the brain, with only a few openings for nerves and blood vessels. Surrounding the brain is a region of the skull known as the cranium. The skull is a bony structure that supports the face and forms a protective cavity for the brain. Upon reaching maturity, our skull bones fuse to produce a rigid protective shell for the soft nervous tissue of our brain. Early separation of the bones provides the fetal skull with the flexibility necessary to pass through the tight confines of the birth canal.ĭuring childhood development, the skull bones remain somewhat separated, allowing for growth of the brain and skull. The only bone that remains separate from the rest of the skull is the mandible, or jaw bone. Including the bones of the middle ear and the hyoid bone, the head contains 29 bones. As these bones grow throughout fetal and childhood development, they begin to fuse together, forming a single skull. Except for the jaw, which is attached to the skull by the movable, synovial temporomandibular joints (TMJ), the skull is composed of various bones joined together at immobile joints called. During fetal development, the bones of the skull form within tough, fibrous membranes in a fetus’ head. In adulthood, after certain bones have fused, the count reduces to about 206 bones. A collection of 22 bones, the skull protects the all-important brain and supports the other soft tissues of the head. ![]()
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