![]() ![]() The cranial bones are developed in the mesenchymal tissue surrounding the head end of the notochord. S: Sphenoid bone Ossification and Development of the Cranial Bones ![]() The bold letters in these sentences and phrase correspond to each cranial bone’s name. Ethan’s Fried Spanish Pasta Tempted OctaviaĪnother easy phrase would be ‘ STEP OF 6’, where the 6 stands for six types of cranial bones.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 parts of these bones that lie inferior to the brain are considered to be a part of the. These bones protect the brain superiorly, but also provide an anchor for important muscles of facial expression and eye movement. The irregular shapes of these joints allow all the uniquely shaped cranial bones to join. The calvarium, also known as the roof or skull cap, consists of three bones: Frontal bones. 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. The lower seven cranial nerves and the major vessels to and from the brain traverse the temporal bone. The temporal bones are overlaid by the sides of the head known as the temples, and house the structures of the ears. Frontal Bone: An unpaired flat bone that makes up the forehead and upper part of the eye sockets.Ģ. The temporal bones are situated at the sides and base of the skull, and lateral to the temporal lobes of the cerebral cortex. 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.As we know, all the cranial bones fuse to form the neurocranium to perform the following functions: ![]()
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