From Wikipedia, the free encyclopedia
Sinus may refer to:
In anatomy, a sinus is a cavity within a bone or other tissue. Most are commonly found in the bones of the face and connecting with the nasal cavities.
- 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, are in the frontal bone, which forms the hard part of the forehead.
- the ethmoid sinuses are formed from several discrete air cells within the ethmoid bone between the nose and the eyes.
- the sphenoid sinuses are in the sphenoid bone at the center of the skull base under the pituitary gland.
- Anal sinuses are the furrows which separate the columns in the rectum.
- Dural venous sinuses are 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 heart;
- 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;
- Sinus (botany), a space or indentation, usually on a leaf.
- Sine, a trigonometric math function (Latin sinus)
- 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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