![]() ![]() Just inferior to the middle concha is a small, bony projection called the uncinate process, which forms a part of the medial wall of the maxillary sinus. ![]() Another curved projection forms the middle nasal conchae, which also have an associated meatus. Contents 4.1 Occipital Bone (os occipitale) 4.2 Sphenoid Bone (os sphenoidale) 4.3 Temporal Bone (os temporale) 4.4 Frontal Bone (os frontale) 4.5 Parietal. The lateral surfaces of the labyrinth are covered by very thin, smooth plates called the lamina papyracea. The posterior parts of the medial surfaces of the labyrinth contain thin, curved bones that form the superior nasal conchae and have an associated superior meatus. Below the cribriform plate laterally lies the ethmoidal labyrinth which contains a network of thin-walled cavities, the ethmoidal cells. Tiny foramina in the cribriform plate allow for the transmission of the olfactory nerves.Įxtending inferiorly from the cribriform plate at the midline is the perpendicular plate. The perpendicular plate is almost entirely smooth except for a number of grooves on either side that lodge the olfactory nerves. On either side of the crista galli, the cribriform plate has grooves that hold an olfactory bulb. The posterior fontanelle usually closes first, before the anterior fontanelle, during the. The crista galli is a midline upward projection to which the falx cerebri attaches. This is the junction of the 2 parietal bones and the occipital bone. Anteriorly, this articulation forms the foramen cecum. The ethmoid has three parts: the cribriform plate, the ethmoidal labyrinth, and perpendicular plate. The cribriform plate integrates into the ethmoidal notch of the frontal bone. The ethmoid bone is located between the eyes and forms part of the nasal cavity, as well as contributing to the eye sockets and skull base. The reason behind it is that some students grab the skull by putting fingers in orbits and applying some pressure over. By the way, it is the most fragile bone in our body made almost entirely by thin bony lamellae. The cranial bones it articulates with, include the frontal and sphenoid bones. An ethmoid bone is a very particular bone localized between eyeballs and making a significant part of the nasal cavity. The ethmoid bone is an unpaired bone shaped like a cube that articulates with 13 cranial and facial bones. ![]()
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