![]() ![]() ![]() The maxillae also contain paranasal sinuses like the frontal, ethmoid, and sphenoid bones of the cranium. 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 spinal cord, a pathway for messages between the brain and the body, is protected by the backbone. The skull protects the brain and forms the shape of the face. Although theyre very light, bones are strong enough to support our entire weight. The 14 bones that support the muscles and organs of the face are collectively known as our facial bones. Bones provide support for our bodies and help form our shape. 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. When this occurs, the suture is said to close. The occipital bone also forms the atlanto-occipital joint with the atlas (the first cervical vertebra in our spine). Around two years of age, a childs skull bones begin to join together because the sutures become bone. 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. (Frontal, temporal, parietal and occipital bones) From an aesthetic standpoint, however, it is better to describe head and skull shape concerns in terms of. Surrounding the brain is a region of the skull known as the cranium. 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. As these bones grow throughout fetal and childhood development, they begin to fuse together, forming a single skull. The spinal cord, a pathway for messages between the. ![]() During fetal development, the bones of the skull form within tough, fibrous membranes in a fetus’ head. The skull protects the brain and forms the shape of the face. 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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