Other articles where Ethmoid bone is discussed: human skeleton: Interior of the cranium: …small holes) plate of the ethmoid bone, a midline bone important as a part both of the cranium and of the nose. Gross anatomy. It is one of eight cranial bones, two of these – the parietal and temporal bones – are paired; the others – the frontal, occipital, sphenoid, and ethmoid bones – are unpaired.. The human ethmoid bone comprises two very delicate, hollow, blocks of bone; the lateral surfaces of the blocks contribute to the medial walls of the orbits. At least a part of the human ethmoid bone can be seen from the outside of the skull. It contributes to the anterior cranial fossa.. This plate which is situated between the anterior cranial fossa and the nasal cavity is a part of the ethmoid bone that supports the olfactory nerves. The ethmoid bone has four parts:. Both Grant (1944) and Moffat (1987) have provided useful descriptions of the human ethmoid bone. Cribriform plate of ethmoid. The ethmoid bone consists of four parts: Through the perforations of the plate run many divisions of the olfactory, or first cranial, nerve, coming from the mucous membrane of the nose. The ethmoid bone is a cuboid-shaped cranial bone located at the top of the nasal cavity and is shown in various anatomical views. The cranial bones it articulates with, include the frontal and sphenoid bones. It is one of eight cranial bones, two of these – the parietal and temporal bones – are paired; the others – the frontal, occipital, sphenoid, and ethmoid bones – are unpaired. In human anatomy, the ethmoid bone is one of the bones that make up the skull.It is situated between the nasal cavity and the brain cavity, and makes up the nasal cavity roof, part of the nasal cavity walls, part of the bony orbits around the eyes, and part of the floor of the cranium. These nerves run through the tiny perforations situated in Cribriform Plate and provide with a sense of smell to humans. These are the cribriform plate, two ethmoid labyrinths, and a perpendicular plate. It forms the roof of the nasal cavity and part of the anterior cranial fossa of the internal cranial base. They lie between the upper parts of the nasal cavities and the orbits , and are separated from these cavities by thin bony lamellae. The ethmoid air cells are numerous thin-walled cavities situated in the ethmoidal labyrinth and completed by the frontal, maxilla, lacrimal, sphenoidal, and palatine bones. The Skeletal System: The skeletal system mainly functions in providing structural support to the other systems of the body. The Cribriform Plate forms the roof of the nasal cavity. Parts. Anatomical features are labeled and highlighted in this interactive tutorial. Facial bones Ethmoid Bone Anatomy. The cribriform plate of the ethmoid is a part of the ethmoid bone situated in the horizontal plane, covering the ethmoidal incisure. Start studying parts of the Ethmoid bone. There are four main ethmoid bone parts. cribriform plate, perpendicular plate, ethmoidal labyrinth (2). The ethmoid bone is an unpaired bone shaped like a cube that articulates with 13 cranial and facial bones. Is the ethmoid bone part of the axial skeleton? Each part has its own set of functions. These are the cribriform plate, two ethmoid labyrinths, and a perpendicular plate. The ethmoid bone is a single midline facial bone that separates the nasal cavity from the brain and is located at the roof of the nose and between the orbits.It is a cubical shape and is relatively lightweight because of its spongy construction. The ethmoid has three parts: the cribriform plate, the ethmoidal labyrinth, and perpendicular plate. The ethmoid bone consists of four parts: the horizontal Cribriform plate (lamina cribrosa), part of the cranial base; the vertical Perpendicular plate (lamina perpendicularis), which is part of the nasal septum; the two lateral masses or labyrinths. 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