![]() ![]() Here are some sentences that will help you to remember the names of these cranial bones: The sutures do not fuse until adulthood, so the brain continues growing as a person grows. ![]() The irregular shapes of these joints allow all the uniquely shaped cranial bones to join. These 8 bones are held together by unique, immovable joints, called sutures, made of thick connective tissues. The sphenoid articulates with all the other cranial bones, as well as with the facial bones zygomatic, palatine, and vomer, thus connecting the neurocranium to the facial skeleton. It forms a large part of the skull base, as it spans the width of the skull. ![]() Sphenoid Bone: An unpaired irregular bone located just below the frontal bone. These bones protect auditory nerves and a few ear structures that control hearing and balance.Ħ. However, unlike the previous, these are irregular bones. Temporal Bones: A paired bone, located under each of the parietal bones. Ethmoid Bone: Another unpaired irregular bone located in front of the sphenoid bone that forms a part of the nasal cavity.ĥ. It protects the brain lying underneath.Ĥ. Parietal Bones: A pair of flat bones located on either side of the head, just behind the frontal bone. It has an opening through which the spinal cord passes and connects to the brain.ģ. Occipital Bone: Another unpaired flat bone found at the back of the skull. Frontal Bone: An unpaired flat bone that makes up the forehead and upper part of the eye sockets.Ģ. Here are the individual bones that form the neurocranium:ġ. Anatomically, it is divided into two parts:Ĭranial Roof: Also known as calvarium, this part of the neurocranium is formed by the frontal, occipital, and two parietal bones.Ĭranial Base: It is composed of the frontal, sphenoid, ethmoid, occipital, parietal, and temporal bones. The neurocranium is somewhat spherical, mostly resembling a baseball cap. Allowing the passage of the cranial nerves necessary for our day-to-day functioning, such as seeing, smelling, and chewing.Providing a surface for the facial muscles to attach.Protecting the brain from any external injury or shock.The maxillae also contain paranasal sinuses like the frontal, ethmoid, and sphenoid bones of the cranium.As we know, all the cranial bones fuse to form the neurocranium to perform the following functions: 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. 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. During fetal development, the bones of the skull form within tough, fibrous membranes in a fetus’ head. A collection of 22 bones, the skull protects the all-important brain and supports the other soft tissues of the head. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |