Ethmoidal labyrinthThe ethmoidal labyrinth or lateral mass of the ethmoid bone consists of a number of thin-walled cellular cavities, the ethmoid air cells, arranged in three groups, anterior, middle, and posterior, and interposed between two vertical plates of bone; the lateral plate forms part of the orbit, the medial plate forms part of the nasal cavity.
Ethmoid bullaThe ethmoid bulla (or ethmoidal bulla) is a rounded elevation upon the lateral wall of the middle nasal meatus (nasal cavity inferior to the middle nasal concha) produced by one or more of the underlying middle ethmoidal air cells (which open into the nasal cavity upon or superior to the ethmoidal bulla).
Ethmoid boneThe ethmoid bone (; from Ancient Greek: ἡθμός, romanized: hēthmós, lit.'sieve') is an unpaired bone in the skull that separates the nasal cavity from the brain. It is located at the roof of the nose, between the two orbits. The cubical (cube-shaped) bone is lightweight due to a spongy construction. The ethmoid bone is one of the bones that make up the orbit of the eye. StructureThe ethmoid bone is an anterior cranial bone located between the eyes.
Ethmoidal infundibulumThe ethmoidal infundibulum is a funnel-shaped, slit-like curved opening upon the anterosuperior portion of the middle nasal meatus (and thus of the lateral wall of the nasal cavity) at the hiatus semilunaris (which represents the medial extremity of the infundibulum). The anterior ethmoidal air cells (and also medial ethmoidal air cells - variation), and usually the frontonasal duct (which drains the frontal sinus) open into the ethmoidal infundibulum.
Nasal cavityThe nasal cavity is an air-filled space above and behind the nose in the middle of the face. The nasal septum divides the cavity into two cavities, also known as fossae. Each cavity is the continuation of one of the two nostrils (nares).
Maxillary sinusThe pyramid-shaped maxillary sinus (or antrum of Highmore) is the largest of the paranasal sinuses, located in the maxilla. It drains into the middle meatus of the nose through the semilunar hiatus. It is located to the side of the nasal cavity, and below the orbit.
Nasal meatusIn anatomy, the term nasal meatus can refer to any of the three meatuses (passages) through the skull's nasal cavity: the superior meatus (meatus nasi superior), middle meatus (meatus nasi medius), and inferior meatus (meatus nasi inferior). The nasal meatuses are the spaces beneath each of the corresponding nasal conchae. In the case where a fourth, supreme nasal concha is present, there is a fourth supreme nasal meatus.
Orbit (anatomy)In vertebrate anatomy, the orbit is the cavity or socket/hole of the skull in which the eye and its appendages are situated. "Orbit" can refer to the bony socket, or it can also be used to imply the contents. In the adult human, the volume of the orbit is about 28 millilitres (0.99 imp fl oz; 0.95 US fl oz), of which the eye occupies 6.5 ml (0.23 imp fl oz; 0.22 US fl oz).
Paranasal sinusesParanasal sinuses are a group of four paired air-filled spaces that surround the nasal cavity. The maxillary sinuses are located below the eyes; the frontal sinuses are above the eyes; the ethmoidal sinuses (or ethmoid cells) are between the eyes, and the sphenoidal sinuses are behind the eyes. The sinuses are named according to the bones composing them, namely the frontal, maxillary, ethmoid and sphenoid bones.*As an Amazon Associate I earn from qualifying purchases.