Sinus tract

Sinus tract

A narrow, elongated channel in the body that allows the escape of fluid.

Mentioned in: Actinomycosis

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sinus (sī´nus),

n a cavity, recess, or hollow space.

sinus, alveolar,

n a passage connecting a pathologic cavity in the alveolus with the oral or nasal cavity and penetrating the mucous membrane. See also fistula, alveolar.

sinus balloon,

n See balloon, sinus.

sinus, carotid,

n the swelling in the artery just before the common carotid artery bifurcates into the internal and external carotid arteries.

sinus, coronary,

n the venous sinus in the groove between the left cardiac auricle and the left ventricle.

sinus(es), ethmoidal

n an air space located within the ethmoid bone, which comprises the floor of the skull and the roof of the nose. There are four ethmoid sinuses: the anterior, middle, and two posterior sinuses. The anterior and middle sinuses drain directly into the middle meatus (opening) of the nose. The posterior sinuses drain into the superior meatus of the nose.

sinus(es), frontal,

n an air space located within the frontal bone of the forehead.

sinus(es), maxillary (antrum of Highmore, maxillary antrum),

n a large pyramidal cavity within the body of the maxilla. Its walls are thin and correspond to the orbital, nasal anterior, and infratemporal surfaces of the body of the maxilla. On dental radiographs the floor of the sinus is often observed approximating the root apices of the teeth and is seen to extend from the canine or premolar region posteriorly to the molar or tuberosity region.

sinus(es), paranasal,

n the paired air cavities in various bones around the nose, including the maxillary sinus within the maxilla, the sphenoid sinus in the sphenoid bone, the ethmoid sinuses in the ethmoid bone, and the frontal sinus in the frontal bone.

sinus(es), sphenoid

n an air space located within the wing-like sphenoid bone, located at the base of the skull. These sinuses are variable in shape and size, and are rarely symmetrical because of lateral displacement of the septum.

sinus tract,

n See tract, sinus.

sinus pneumatization

n an enlargement of the maxillary sinus, usually as part of the aging process and as a result of the loss of maxillary teeth.