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The fleshy external end of the nasal septum is called the columella or columella nasi, and is made up of cartilage and soft tissue. [2] The nasal septum contains bone and hyaline cartilage. [3] It is normally about 2 mm thick. [4] The nasal septum is composed of four structures: Maxillary bone (the crest) Perpendicular plate of ethmoid bone
The septum grows down from the roof of the nasal cavity and fuses with the developing palates along the midline. The septum divides the nasal cavity into two nasal passages opening into the pharynx through the definitive choanae. [48] [49] At ten weeks, the cells differentiate into muscle, cartilage, and bone.
The nasal septum divides the cavity into two cavities, [1] also known as fossae. [2] Each cavity is the continuation of one of the two nostrils. The nasal cavity is the uppermost part of the respiratory system and provides the nasal passage for inhaled air from the nostrils to the nasopharynx and rest of the respiratory tract.
The septal nasal cartilage (cartilage of the septum or quadrangular cartilage) is composed of hyaline cartilage. [1] It is somewhat quadrilateral in form, thicker at its margins than at its center, and completes the separation between the nasal cavities in front.
The neurons' dendrites project towards the nasal cavity while their axons ascend through the cribriform plate [1] as the olfactory nerves. [ 3 ] The part of the nasal cavity that is lined with olfactory mucosa is known as the olfactory region ( pars olfactoria tunicae mucosae nasi ), [ 2 ] while the rest of the nasal cavity that is lined by ...
The sphenoethmoidal recess is a small triangular space superior to the superior nasal meatus of the nasal cavity into which the sphenoidal sinus [1] [2] [3] opens. [4] The sphenoethmoidal recess is situated supero posterior to the superior nasal concha, [3] [2] between the superior nasal concha and the anterior aspect of the body of the sphenoid bone.
Because only thin shelves of bone separate the sphenoidal sinuses from the nasal cavities, below, and from the hypophyseal fossa, above, the pituitary gland can be reached surgically through the roof of the nasal cavities by passage through the anterioinferior aspect of the sphenoid bone and into the sinuses, followed by entry through the top ...
The VNO is found at the base of the nasal cavity. It is split into two, being divided by the nasal septum, with both sides possessing an elongated C-shaped, or crescent, lumen. It is encompassed inside a bony or cartilaginous capsule which opens into the base of the nasal cavity. [9]