Sinus may refer to:
History
* a sac in front of body worn into a
toga, in the typical style of wearing it
Anatomy
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Sinus (anatomy), a sac or cavity in any organ or tissue
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Paranasal sinuses
Paranasal sinuses are a group of four paired air-filled spaces that surround the nasal cavity. The maxillary sinuses are located under the eyes; the frontal sinuses are above the eyes; the ethmoidal sinuses are between the eyes and the sphe ...
, air cavities in the cranial bones, especially those near the nose, including:
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Maxillary sinus
The pyramid-shaped maxillary sinus (or antrum of Nathaniel Highmore (surgeon), Highmore) is the largest of the paranasal sinuses, located in the maxilla. It drains into the middle meatus of the noseHuman Anatomy, Jacobs, Elsevier, 2008, page 209- ...
, is the largest of the paranasal sinuses, under the eyes, in the maxillary bones
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Frontal sinus, superior to the eyes, in the frontal bone, which forms the hard part of the forehead
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Ethmoid sinus, formed from several discrete air cells within the ethmoid bone between the eyes and under the nose
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Sphenoidal sinus
The sphenoid sinus is a paired paranasal sinus in the Body of sphenoid bone, body of the sphenoid bone. It is one pair of the four paired paranasal sinuses.Illustrated Anatomy of the Head and Neck, Fehrenbach and Herring, Elsevier, 2012, page 64 T ...
, in the sphenoid bone at the center of the skull base under the pituitary gland
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Anal sinuses, the furrows which separate the columns in the rectum
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Dural venous sinuses, venous channels found between layers of dura mater in the brain
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Sinus (botany), a space or indentation, usually on a leaf
Heart
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Sinus node, a structure in the superior part of the right atrium
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Sinus rhythm, normal beating on an ECG
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Coronary sinus
The coronary sinus () is the largest vein of the heart. It drains over half of the deoxygenated blood from the heart muscle into the right atrium. It begins on the backside of the heart, in between the left atrium, and left ventricle; it begi ...
, a vein collecting blood from the heart
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Sinus venosus
The sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart.
In mammals, the sinus venosus exists distinctly only in the embryonic heart where it is found between the two venae cavae; i ...
, a cavity in the heart of embryos
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Sinus venarum, a part of the wall of the right atrium in adults, developed from the sinus venosus
Other uses
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Sinus (Chalcidice), a town of ancient Chalcidice, Greece
* ''Sinus'', gulf or bay in Latin, used in numerous toponyms in ancient writing (e.g.,
Sinus Magnus,
Sinus Flanaticus, etc.)
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Sine
In mathematics, sine and cosine are trigonometric functions of an angle. The sine and cosine of an acute angle are defined in the context of a right triangle: for the specified angle, its sine is the ratio of the length of the side opposite th ...
, a trigonometric math function (Latin ''sinus'')
See also
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Sinus Medii, a small lunar mare
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Sinus Successus, a lunar feature
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Sines, a municipality in Alentejo, Portugal (Latin ''Sinus'')
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Sinusitis
Sinusitis, also known as rhinosinusitis, is an inflammation of the mucous membranes that line the sinuses resulting in symptoms that may include production of thick nasal mucus, nasal congestion, facial congestion, facial pain, facial pressure ...
, a common ailment resulting in the inflammation of the paranasal sinuses
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