Sinus may refer to:

History

* a sac in front of body worn into a

toga The toga (, ), a distinctive garment of Ancient Rome, was a roughly semicircular cloth, between in length, draped over the shoulders and around the body. It was usually woven from white wool, and was worn over a tunic. In Roman historical tra ...

, in the typical style of wearing it

Anatomy

Sinus (anatomy) A sinus is a sac or cavity in any organ or tissue, or an abnormal cavity or passage. In common usage, "sinus" usually refers to the paranasal sinuses, which are air cavities in the cranial bones, especially those near the nose and connecting to ...

, a sac or cavity in any organ or tissue **

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: ***

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 ***

Frontal sinus The frontal sinuses are one of the four pairs of paranasal sinuses that are situated behind the brow ridges. Sinuses are mucosa-lined airspaces within the bones of the face and skull. Each opens into the anterior part of the corresponding middle ...

, superior to the eyes, in the frontal bone, which forms the hard part of the forehead ***

Ethmoid sinus The ethmoid sinuses or ethmoid air cells of the ethmoid bone are one of the four paired paranasal sinuses. Unlike the other three pairs of paranasal sinuses which consist of one or two large cavities, the ethmoidal sinuses entail a number of small ...

, formed from several discrete air cells within the ethmoid bone between the eyes and under the nose ***

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 ** Anal sinuses, the furrows which separate the columns in the rectum **

Dural venous sinuses The dural venous sinuses (also called dural sinuses, cerebral sinuses, or cranial sinuses) are venous sinuses (channels) found between the periosteal and meningeal layers of dura mater in the brain. They receive blood from the cerebral veins, ...

, venous channels found between layers of dura mater in the brain *

Sinus (botany) In botany, a sinus is a space or indentation between two lobes or teeth, usually on a leaf. The term is also used in mycology. For example, one of the defining characteristics of North American species in the ''Morchella elata'' clade of morels ...

, a space or indentation, usually on a leaf

Heart

Sinus node The sinoatrial node (also known as the sinuatrial node, SA node, sinus node or Keith–Flack node) is an oval shaped region of special cardiac muscle in the upper back wall of the right atrium made up of cells known as pacemaker cells. The sin ...

, a structure in the superior part of the right atrium *

Sinus rhythm A sinus rhythm is any cardiac rhythm in which depolarisation of the cardiac muscle begins at the sinus node. It is necessary, but not sufficient, for normal electrical activity within the heart. On the electrocardiogram (ECG), a sinus rhythm ...

, normal beating on an ECG *

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 *

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 *

Sinus venarum The sinus venarum (also known as the sinus of the vena cava, or sinus venarum cavarum) is the portion of the right atrium in the adult human heart where the inner surface of the right atrium is smooth, whereas the rest of the inner surface is rough ...

, a part of the wall of the right atrium in adults, developed from the sinus venosus

Other uses

Sinus (Chalcidice) Sinus or Sinos () was a town of the Chalcidice in ancient Macedonia. It belonged to the Delian League since it appears in the tribute records of Athens of 434/3 and 433/2 BCE, where it paid a '' phoros'' of 1500 drachmas Drachma may refer to: ...

, a town of ancient Chalcidice, Greece * ''Sinus'', gulf or bay in Latin, used in numerous toponyms in ancient writing (e.g.,

Sinus Magnus The Magnus Sinus or Sinus Magnus (Latin; , ''o Mégas Kólpos''), also anglicized as the was the form of the Gulf of Thailand and South China Sea known to Greek, Roman, Arab, Persian, and Renaissance cartographers before the Age of Discovery. ...

Sinus Flanaticus The Kvarner Gulf (, or ; ; or ) sometimes also Kvarner Bay, is a bay in the northern Adriatic Sea, located between the Istrian peninsula and the northern Croatian Littoral mainland. The bay is a part of Croatia's internal waters. The largest i ...

, etc.) *

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'')

History

Anatomy

Heart

Other uses

See also