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sinus, cavity or hollow space in the body, usually filled with air or blood. In humans the paranasal sinuses, mucus-lined cavities in the bones of the face, are connected by passageways to the nose and probably help to warm and moisten inhaled air. When drainage from them is blocked, as after a cold, these sinuses often become infected, a condition called sinusitis. The accumulation of pus results in pressure, headaches, pain, and general discomfort. In invertebrates one of the spaces among the muscles and viscera through which blood returns to the heart is also known as a sinus.
sinus (sÿ -nŭs) A semienclosed break along the borders of a lunar mare or in a scarp. The word is used in the approved name of such a feature on the Moon. (Latin: bay)
in anatomy, a cavity, protrusion, or long closed channel. In vertebrates (including man), the term “sinus” refers to a channel filled with venous blood in the dura mater. The cavity in some cranial bones is also called a sinus. [23–1297–]
A cavity, recess, or depression in an organ, tissue, or other part of an animal body.
a. any bodily cavity or hollow space
b. a large channel for venous blood, esp between the brain and the skull
c. any of the air cavities in the cranial bones
2. Pathol a passage leading to a cavity containing pus
3. Botany a small rounded notch between two lobes of a leaf, petal, etc.
4. an irregularly shaped cavity
References in periodicals archive
Endovascular treatment of dural sinus
thrombosis with rheolytic thrombectomy and intra-arterial thrombolysis.
On contrast-enhanced CT, DST is seen as lack of opacification of the thrombosed dural sinus.
The empty delta sign: Frequency and significance in 76 cases of dural sinus thrombosis.
Cerebral vein and dural sinus thrombosis in Portugal: 1980-1998.
Thrombolysis for cerebral vein and dural sinus thrombosis.
Dural sinus thrombosis (DST), also known as cerebral venous thrombosis, describes thrombosis of cortical and deep cerebral veins as well as that of the dural sinuses.
DST usually begins with a partially occlusive thrombus within the dural sinus that progresses to obstruct the involved dural sinus and then extends to bridging cortical veins.
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