Editing Sinus (section)

==Anatomy==
* [[Sinus (anatomy)]], a sac or cavity in any organ or tissue
** [[Paranasal sinuses]], air cavities in the cranial bones, especially those near the nose, including:
*** [[Maxillary sinus]], is the largest of the paranasal sinuses, under the eyes, in the maxillary bones
*** [[Frontal sinus]], superior to the eyes, in the frontal bone, which forms the hard part of the forehead
*** [[Ethmoid sinus]], formed from several discrete air cells within the ethmoid bone between the eyes and under the nose
*** [[Sphenoidal sinus]], 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
* [[Sinus (botany)]], a space or indentation, usually on a leaf

===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