In anatomy, where a sinus is a sac or cavity in any organ or tissue:
  • Sinus (anatomy)
    Sinus (anatomy)
    Sinus is Latin for "bay", "pocket", "curve", or "bosom". In anatomy, the term is used in various contexts.A sinus is a sack or cavity in any organ or tissue, or an abnormal cavity or passage caused by the destruction of tissue...

    , description of the general term
  • Paranasal sinuses, air cavities in the cranial bones, especially those near the nose, including:
    • the maxillary sinus
      Maxillary sinus
      The pyramid shaped maxillary sinus is the largest of the paranasal sinuses, and drains into the nose. It is present at birth as rudimentary air cells, and develops throughout childhood.-General characteristics:...

      es, also called the maxillary antra and the largest of the paranasal sinuses, are under the eyes, in the maxillary bones.
    • the frontal sinus
      Frontal sinus
      Sinuses are mucosa-lined airspaces within the bones of the face and skull. The frontal sinuses, situated behind the superciliary arches, are absent at birth, but are generally fairly well developed between the seventh and eighth years, only reaching their full size after puberty...

      es, superior to the eyes, in the frontal bone
      Frontal bone
      The frontal bone is a bone in the human skull that resembles a cockleshell in form, and consists of two portions:* a vertical portion, the squama frontalis, corresponding with the region of the forehead....

      , which forms the hard part of the forehead
      For the Arsenal striker see GervinhoIn human anatomy, the forehead is the fore part of the head. It is, formally, an area of the head bounded by three features, two of the skull and one of the scalp. The top of the forehead is marked by the hairline, the edge of the area where hair on the scalp...

    • the ethmoid sinus
      Ethmoid sinus
      The ethmoid sinus is each of the two paranasal sinuses within the ethmoid bone, comprising the ethmoidal air cells and filled with air. These are divided into anterior, middle and posterior group. The ethmoidal air cells consist of numerous thin-walled cavities situated in the ethmoidal labyrinth...

      es, which are formed from several discrete air cells within the ethmoid bone between the nose and the eyes.
    • the sphenoid sinuses, in the sphenoid bone
      Sphenoid bone
      The sphenoid bone is an unpaired bone situated at the base of the skull in front of the temporal bone and basilar part of the occipital bone.The sphenoid bone is one of the seven bones that articulate to form the orbit...

       at the center of the skull base under the pituitary gland
      Pituitary gland
      In vertebrate anatomy the pituitary gland, or hypophysis, is an endocrine gland about the size of a pea and weighing 0.5 g , in humans. It is a protrusion off the bottom of the hypothalamus at the base of the brain, and rests in a small, bony cavity covered by a dural fold...

  • Anal sinuses
    Anal sinuses
    The rectal columns are separated from one another by furrows, or rectal sinuses, which end below in small valve-like folds, termed anal valves.-External links: - "The Female Pelvis: The Rectum"...

    , the furrows which separate the columns in the rectum
  • Dural venous sinuses
    Dural venous sinuses
    The dural venous sinuses are venous channels found between layers of dura mater in the brain...

    , 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
    Sinus rhythm
    In medicine, sinus rhythm is the normal beating of the heart, as measured by an electrocardiogram . It has certain generic features that serve as hallmarks for comparison with normal ECGs.- ECG structure :...

    , normal beating on an ECG
  • Coronary sinus
    Coronary sinus
    The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the myocardium of the heart. It is present in all mammals, including humans...

    , a vein collecting blood from the myocardium
  • Sinus venosus
    Sinus venosus
    The sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart. In humans, it exists distinctly only in the embryonic heart, where it is found between the two venae cavae...

    , 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)
    Sinus (botany)
    In botany, a sinus is a space or indentation, usually on a leaf, between two lobes or teeth that does not break the continuity of the structure....

    , a space or indentation, usually on a leaf


  • Several bay-like structures on the surface of the moon:
    • Sinus Aestuum
      Sinus Aestuum
      Sinus Aestuum forms a northeastern extension to Mare Insularum. It has selenographic coordinates 10.9° N, 8.8° W, and it lies within a diameter of 290 km....

    • Sinus Amoris
      Sinus Amoris
      Sinus Amoris extends northward from the northeast end of the Mare Tranquillitatis. It is located at selenographic coordinates 18.1° N, 39.1° E, and lies within a diameter of 130 km. To the north of the bay are the jumbled Montes Taurus peaks.Near the southern end of the bay where it outlets...

    • Sinus Asperitatis
      Sinus Asperitatis
      Sinus Asperitatis is an area of lunar mare that extends southward from the Mare Tranquillitatis until it joins the Mare Nectaris to the southeast. It is bordered along the western and eastern sides by continental regions of irregular terrain...

    • Sinus Concordiae
      Sinus Concordiae
      Sinus Concordiae is a bay on the Moon that lies along the eastern edge of the Mare Tranquillitatis. Along its northern border is an area called the Palus Somni, while the southern border is an area of irregular terrain that contains the ruined crater Da Vinci...

    • Sinus Fidei
      Sinus Fidei
      Sinus Fidei is a small basaltic mare feature in the Terra Nivium region of the Moon....

    • Sinus Iridium
    • Sinus Lunicus
      Sinus Lunicus
      Sinus Lunicus is an area of lunar mare along the southeast edge of the Mare Imbrium. It is formed by the area enclosed by the prominent craters Archimedes to the southwest, Autolycus to the southeast, and Aristillus to the northeast...

    • Sinus Medii
      Sinus Medii
      Sinus Medii is a small lunar mare that is located at the intersection of the Moon's equator and prime meridian. As seen from the Earth, this feature is located in the central part of the Moon's near side, and it is the point closest to the Earth...

    • Sinus Successus
      Sinus Successus
      The lunar feature Sinus Successus lies along the eastern edge of Mare Fecunditatis. It is an outward bulge that forms a type of bay. The selenographic coordinates of Sinus Successus are 0.9° N, 59.0° E, and the diameter is 132 km.Along the eastern edge of the bay is the flooded crater Condon,...

See also

  • Hemocoel, a space filled with hemolymph in organisms with open circulatory systems
  • Sines, Portugal
    Sines, Portugal
    Sines is a coastal municipality in the district of Setúbal, in the Alentejo Litoral region of the Portuguese Alentejo. Its population in 2011 was over 14260 residents, with a total area of 203.3 km², concentrated on the municipal seat of Sines.-History:...

    , a municipality in Alentejo (Latin Sinus)
  • Sinusitis
    Sinusitis is inflammation of the paranasal sinuses, which may be due to infection, allergy, or autoimmune issues. Most cases are due to a viral infection and resolve over the course of 10 days...

    , a common ailment resulting in the inflammation of the paranasal sinuses
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