These nerves run through the tiny perforations situated in Cribriform Plate and provide with a sense of smell to humans. 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. They lie between the upper parts of the nasal cavities and the orbits , and are separated from these cavities by thin bony lamellae. There are four main ethmoid bone parts. Is the ethmoid bone part of the axial skeleton? The ethmoid bone is a cuboid-shaped cranial bone located at the top of the nasal cavity and is shown in various anatomical views. 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 ethmoid air cells are numerous thin-walled cavities situated in the ethmoidal labyrinth and completed by the frontal, maxilla, lacrimal, sphenoidal, and palatine bones. It contributes to the anterior cranial fossa.. The ethmoid bone has four parts:. The cranial bones it articulates with, include the frontal and sphenoid bones. Anatomical features are labeled and highlighted in this interactive tutorial. These are the cribriform plate, two ethmoid labyrinths, and a perpendicular plate. Gross anatomy. The Skeletal System: The skeletal system mainly functions in providing structural support to the other systems of the body. It forms the roof of the nasal cavity and part of the anterior cranial fossa of the internal cranial base. Both Grant (1944) and Moffat (1987) have provided useful descriptions of the human ethmoid bone. Sometimes called the ethmoidal bone, this important structure is pneumatized, which is to say it is a … 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. cribriform plate, perpendicular plate, ethmoidal labyrinth (2). Learn vocabulary, terms, and more with flashcards, games, and other study tools. 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. These are the cribriform plate, two ethmoid labyrinths, and a perpendicular plate. The ethmoid bone is an unpaired bone shaped like a cube that articulates with 13 cranial and facial bones. 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. At least a part of the human ethmoid bone can be seen from the outside of the skull. The Cribriform Plate forms the roof of the nasal cavity. 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 consists of four parts: The cribriform plate of the ethmoid is a part of the ethmoid bone situated in the horizontal plane, covering the ethmoidal incisure. Ethmoid bone anatomy is quite complicated. There are four main ethmoid bone parts. 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. Facial bones Ethmoid Bone Anatomy. 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