The nasal cavity forms the first part of the airway and is divided into left and right halves by the nasal septum. The most anterior part of the nasal cavity, the vestibule, is lined the same stratified squamous epithelium of the external nose. The rest is ciliated, pseudostratified columnar epithelium, except for the olfactory part (responsible for smell) in the roof and adjacent parts of … Continue reading Nasal cavity

External framework The external nose framework is part bone part hyaline cartilage: The bony parts form a pear- shaped opening known as the external nasal aperture. The aperture is bounded superiorly by the two nasal bones and inferiorly plus laterally by the two maxillae. The nasal cartilages are attached to the edge of the anterior nasal aperture to form the nares (nostrils). The lateral boundary … Continue reading Nasal skeleton

Between the nose bridge and glabella (region between eyebrows), the nose is attached superiorly to the forehead via the root, with the nasion being the indentation at the frontonasal suture where the frontal and nasal bones meet. The nasal ridge (dorsum) runs from the root to the tip of the nose. The ala (wings) are cartilaginous and flares inferolaterally to wrap around the nares (nostrils). Continue reading External nose

The conchae are large, medially-directed bony elements projecting from the lateral walls into the cavity. Covered by highly vascular mucous membranes, they increase the surface area of the nasal cavity to heat and humidify air during breathing. Beneath each shelf-like concha is a meatus into which the paranasal sinuses open. Continue reading Nasal conchae & meatuses

Several different nerves supply or run enter the nose: The olfactory nerve is a collection of fibres receptor cell axons in the olfactory mucous membrane and pass through openings in the cribriform plate of the ethmoid bone. General sensation is mediated by branches of the ophthalmic and maxillary nerves (divisions of CN V). Parasympathetic secretomotor supply to the mucous glands is mediated by postganglionic fibres … Continue reading Nose nerves