Sinus

A sinus is a pouch or cavity in any organ or 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 the human body, such as:-

Related Topics:
Organ - Tissue

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• The air cavities in the cranial bones, especially those near the nose and connecting to it. These are the paranasal sinuses and 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.
• The spaces surrounding the organs in spiders which are filled with haemolymph
 
Sinus: See also ►