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Sinus may refer to: == Anatomy == 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; Other: *Sinus (botany), a space or indentation, usually on a leaf. * normal heart rate 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「sinus」の詳細全文を読む スポンサード リンク
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