internal nasal valve
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Related to internal nasal valve: external nasal valve
internal nasal valve
a structure formed by articulation of the anterior ridge of the upper lateral cartilage with the anterior septal edge; a common cause of nasal airway obstruction when the nasal sidewall and the internal valve are unstable.
valve(valv) [L. valva, leaf of a folding door]
Any of various membranous structures in a hollow organ or passage that temporarily close to permit the flow of fluid in one direction only.
aortic valveAbbreviation: AoV
The valve at the junction of the left ventricle and the ascending aorta. It is composed of three segments (semilunar cusps) and prevents regurgitation. See: cardiac valve for illus.
Bauhin valveSee: Bauhin valve
Béraud valveSee: Béraud valve
bicuspid valveMitral valve.
Bjork-Shiley heart valve
A synthetic artificial heart valve that is no longer commercially available but remains implanted in thousands of patients. The valve has been known to fracture at its struts during use, which results in death in the majority of cases.
Any of the four valves that prevent the backflow of blood as it passes into, through, and out of the heart. In order of the entry of the venous blood into the right atrium, they are the tricuspid, pulmonary, mitral, and aortic. See: illustration
Carpentier-Edwards valveSee: Carpentier-Edwards valve.
A valve that permits fluids or gases to flow in just one direction. Check valves are used in infusion sets to prohibit backflow of fluids during intravenous therapy.
The coronary sinus valve at the entrance of the coronary sinus into the right atrium. Synonym: thebesian valve
The valve at the entrance of the inferior vena cava.
external nasal valve
The outermost opening of the nose (the alar rim).
A one-way valve used in chest tube drainage systems that allows fluids or gases to flow out of the chest, but does not let them reenter the bodySynonym: Heimlich flutter valve; Heimlich valve
Gerlach valveSee: Gerlach valve
high-pressure relief valve
A safety device built into a ventilator circuit that protects the patient from excessively high airway pressures by venting excess pressure into the atmosphere.
Houston valveSee: Houston valve
Huschke valveLacrimal plica.
A projection of two membranous folds of the ileum of the small intestine into the cecum of the colon. It prevents backup of fecal material into the small intestine.Synonym: valvula coli
inspiratory impedance threshold valveSee: inspiratory impedance threshold valve
internal nasal valveNasal valve.
Krause valveSee: Krause, Karl
left atrioventricular valveMitral valve.
The valve that closes the orifice between the left cardiac atrium and the left ventricle during ventricular systole.Synonym: bicuspid valve; left atrioventricular valve
The site of greatest obstruction to airflow through the nasal passages. It extends from the bony cave near the piriform aperture into part of the cartilaginous vestibule of the nose. Synonym: internal nasal valve
A safety valve that releases gas into the atmosphere from a ventilator circuit when the pressure in the circuit exceeds a known, safe level.
prosthetic heart valve
A substitute valve used to replace a diseased valve. There are two main types of prostheses: those made from biological tissues, e.g., the heart valves of animals, esp. pigs, and those made from biocompatible materials, e.g., metals or polymers. Biocompatible mechanical valves may be constructed in a variety of ways, e.g., from a ball that moves up and down in a cage; with bileaflet valves that close in the midline; or with a single leaflet (which tilts to open and close). See: illustration
The valve at the junction of the right ventricle and pulmonary artery. It is composed of three semilunar cusps and prevents regurgitation of blood from the pulmonary artery back into the right ventricle. See: cardiac valve for illus.
The prominent circular membranous fold at the pyloric orifice of the stomach. Synonym: valvula pylori
A device to reduce the pressure of gas that has been compressed in a cylinder.
right atrioventricular valveTricuspid valve.
The type of valve separating the heart and aorta and the heart and pulmonary artery. See: cardiac valve for illus.
thebesian valveCoronary valve.
tricuspid valveAbbreviation: TV
The valve that closes the orifice between the right cardiac atrium and right ventricle during ventricular systole. Synonym: right atrioventricular valve; valvula tricuspidalis See: cardiac valve for illus.