Sinus
From The Art and Popular Culture Encyclopedia
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- A pouch or cavity in any organ or tissue, especially the paranasal sinus.
- An abnormal cavity or passage such as a fistula, caused by the destruction of tissue.
Sinus may refer to:
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Anatomy
In anatomy, where a sinus is a sac or cavity in any organ or tissue:
- Sinus (anatomy), description of the general term
- Paranasal sinuses, air cavities in the cranial bones, especially those near the nose, including:
- the maxillary sinuses, also called the maxillary antra and the largest of the paranasal sinuses, are under the eyes, in the maxillary bones.
- the frontal sinuses, superior to the eyes, in the frontal bone, which forms the hard part of the forehead.
- the ethmoid sinuses, which are formed from several discrete air cells within the ethmoid bone between the nose and the eyes.
- the sphenoid sinuses, in the sphenoid bone at the center of the skull base under the pituitary gland.
- Anal sinuses, the furrows which separate the columns in the rectum
- Dural venous sinuses, venous channels found between layers of dura mater in the brain
In the heart:
- Sinus node, a structure in the superior part of the right atrium
- Sinus rhythm, normal beating on an ECG
- Coronary sinus, a vein collecting blood from the myocardium
- Sinus venosus, a cavity in the heart of embryos
- Sinus venarum, a part of the wall of the right atrium in adults, developed from the sinus venosus
Other:
- Sinus (botany), a space or indentation, usually on a leaf
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Mathematics
- Sine a trigonometric math function (Latin sinus)
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Astronomy
- Several bay-like structures on the surface of the moon:
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See also
- Hemocoel, a space filled with hemolymph in organisms with open circulatory systems
- Sines, Portugal, a municipality in Alentejo (Latin Sinus)
- Sinusitis, a common ailment resulting in the inflammation of the paranasal sinuses
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