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The internal nasal valve is the narrowest region of the nasal cavity and is the primary site of nasal resistance. The valves regulate the airflow and resistance. Air breathed in is forced to pass through the narrow internal nasal valve, and then expands as it moves into the nasal cavity.
The nasal cavity has a nasal valve area that includes an external nasal valve and an internal nasal valve. The external nasal valve is bounded medially by the columella, laterally by the lateral nasal cartilage, and posteriorly by the nasal sill.
It is opens into the inferior nasal meatus. It may be partially covered by a mucous fold (valve of Hasner or plica lacrimalis). The opening is situated 1cm inferior to the inferior nasal concha, and about 3cm from the posterior edge of the nostril. Clinical significance. Obstruction of the nasolacrimal duct may occur.
The nasal cartilages are structures within the nose that provide form and support to the nasal cavity. [1] The nasal cartilages are made up of a flexible material called hyaline cartilage (packed collagen) in the distal portion of the nose. [2] There are five individual cartilages that make up the nasal cavity: septal nasal cartilage, lateral ...
A dural venous sinus, in human anatomy, is any of the channels of a branching complex sinus network that lies between layers of the dura mater, the outermost covering of the brain, and functions to collect oxygen-depleted blood. Unlike veins, these sinuses possess no muscular coat.
Coronary sinus. The coronary sinus (from Latin corona 'crown' [citation needed]) is the largest vein of the heart. [1] [2] It drains over half of the deoxygenated blood from the heart muscle into the right atrium. It begins on the backside of the heart, in between the left atrium, and left ventricle; it begins at the junction of the great ...
Fish anatomy. Fish anatomy is the study of the form or morphology of fish. It can be contrasted with fish physiology, which is the study of how the component parts of fish function together in the living fish. [1] In practice, fish anatomy and fish physiology complement each other, the former dealing with the structure of a fish, its organs or ...
In a typical mammalian body such as the human body, the external body orifices are: The nostrils, for breathing and the associated sense of smell. The mouth, for eating, drinking, breathing, and vocalizations such as speech. The ear canals, for the sense of hearing. The nasolacrimal ducts, to carry tears from the lacrimal sac into the nasal cavity.
Nasal meatus. In anatomy, the term nasal meatus [1] 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.
52745. Anatomical terms of bone. [ edit on Wikidata] The nasal bones are two small oblong bones, varying in size and form in different individuals; they are placed side by side at the middle and upper part of the face and by their junction, form the bridge of the upper one third of the nose . Each has two surfaces and four borders.