Sinus

A sinus is a pouch or cavity in any organor tissue, or an abnormal cavity or passage caused by the destruction of tissue. The term is applied to a large number and variety of structures in animals, such as:-

• The air cavities in the cranial bones, especially those near the noseand connecting to it. These are the paranasal sinusesand are usually what is meant when a person's "sinuses" are referred to.
• A dilated portion of a blood vein, such as inside the braincase.
• A chronically infected tract such as a fistula.
• Another name for the hemocoel, a space in organisms with open circulatory systemsfilled with hemolymph.

See also

• Sinus is a Latinname for the trigonometric functionsine, a concept of mathematics. (See trigonometry.)
• Sine wavesoccur in alternating electric current, They occur at both power [50Hz and 60Hz] and radio frequencies. Oscilloscopescan display sine waves for measurement purposes.
• Sinus (movie)is the title of a Norwegian low budget movie, premiereing 26th of December 2005.

fr:Sinus (anatomie)

This article is licensed under the GNU Free Documentation License.
It uses material from the http://en.wikipedia.org/wiki/Sinus Wikipedia article Sinus.