![]() ![]() The ethmoid bone is joined to the frontal bone above, the maxillae below, and the central part of the sphenoid bone behind. The superior and middle conchae are also parts of the ethmoid bone. nasal septum the Crista Galli project superiorly from the ethmoid bone and serves as the. The most lateral part of the ethmoid bone is this paper-thin layer, the lamina papyracea, which forms this part of the medial wall of the orbit.īetween the lamina papyracea and the upper part of the nasal cavity are the ethmoid air cells, as we’ve seen. This video shows the many different parts of the human skull. On each side of the crista galli are the cribriform plates, which we've seen already from above, and from below. This upward projection is the beginning of the crista galli, which rises up in the floor of the anterior cranial fossa. This part, the perpendicular plate of the ethmoid, forms a large part of the bony nasal septum. The ethmoid bone is a singular porous cranial bone that makes up the middle area of the neurocranium and forms the midfacial region of the skull. The main function of the frontal bone is to create the smooth curvature of the forehead. The frontal bone consists of six main parts: the squamous part, nasal part, two orbital plates and two zygomatic plates. The best way to see all of them is to go back to the skull that was divided in the frontal plane.Īll of this is the ethmoid bone. The frontal bone is a shell-shaped, unpaired, flat bone of the skull located in the forehead region. These bones articulate with the 1st cervical vertebra (atlas), the facial bones, and the mandible (jaw). The ethmoid bone is a fragile coalition of parts. Cranial base comprised of the frontal, sphenoid, ethmoid, occipital, parietal, and temporal bones. We’ll do that now, then we’ll come back and look at the openings of the paranasal sinuses. The cribriform plates form both the roof of the nasal cavity and a portion of the anterior cranial fossa floor. It has an upward projection, the crista galli, and a downward projection, the perpendicular plate, which forms the upper nasal septum. We’ve encountered the various parts of the ethmoid bone, but till now we’ve put off seeing the whole of it. Ethmoid Bone The unpaired ethmoid bone is located at the midline within the central skull. ![]() Before we go further, we need to catch up on something that we left unfinished in the previous section: understanding the ethmoid bone. ![]()
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