![]() 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. show bone of the skull between the eyes and at the roof of the nose. Another curved projection forms the middle nasal conchae, which also have an associated meatus. The bone of the skull between the eyes and at the roof of the nose. 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. Anatomy, Head and Neck, Nose Paranasal Sinuses - StatPearls - NCBI Bookshelf The anterior wall corresponds to the facial surface of the maxillary bone, with three clearly identified landmarks the canine fossa and the infraorbital foramen and groove. 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 crista galli is a midline upward projection to which the falx cerebri attaches. Anteriorly, this articulation forms the foramen cecum. The best way to see all of them is to go back to the skull that was divided in the frontal plane. 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 a fragile coalition of parts. The cranial bones it articulates with, include the frontal and sphenoid bones. The sphenoid and ethmoid bones located to the front of the skull form parts of the orbital sockets. A single occipital bone forms the base of the skull, and the frontal bone forms the forehead. The ethmoid bone is an unpaired bone shaped like a cube that articulates with 13 cranial and facial bones. The neurocranium consists of two temporal bones situated to the base and side of the skull, and two parietal bones that make up the roof of the skull. ![]()
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