Sinus may refer to:

In anatomy, where a sinus is a sac or cavity in any organ or tissue:

• Paranasal sinus, an air cavity in the cranial bones, especially those near the nose
• Sinus (anatomy), description of the general term
• 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: This article does not cite any references or sources. ... Sinus is Latin for bay, pocket, curve or bosom. In anatomy, the term is used in various contexts. ... The rectal columns are separated from one another by furrows, or rectal sinuses, which end below in small valve-like folds, termed anal valves. ... The dural venous sinuses (also called dural sinuses or cerebral sinuses) are venous channels found between layers of dura mater in the brain. ...

• 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: The sinoatrial node (abbreviated SA node, also called the sinus node) is the impulse generating (pacemaker) tissue located in the right atrium of the heart. ... Sinus rhythm is indicative of normal electrical conductance of the heart. ... The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the myocardium of the heart. ... Sinus venosus can refer to: Another name for the embryological structure Sinus venarum A type of atrial septal defect This is a disambiguation page: a list of articles associated with the same title. ... The sinus venosus is the large quadrangular cavity located between the two venae cavae in the embryonic human heart. ...

• Sinus (botany), a space or indentation, usually on a leaf

For other uses, see Sinus (disambiguation). ...

See also

• Hemocoel, a space filled with hemolymph in organisms with open circulatory systems
• Sine a trigonometric math function (Latin sinus)
• Sines, Portugal, a municipality in Alentejo (Latin Sinus)

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.