sinus

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sinus,

cavity or hollow space in the body, usually filled with air or blood. In humans the paranasal sinuses, mucus-lined cavities in the bones of the face, are connected by passageways to the nose and probably help to warm and moisten inhaled air. When drainage from them is blocked, as after a cold, these sinuses often become infected, a condition called sinusitis. The accumulation of pus results in pressure, headaches, pain, and general discomfort. In invertebrates one of the spaces among the muscles and viscera through which blood returns to the heart is also known as a sinus.

sinus

(sÿ -nŭs) A semienclosed break along the borders of a lunar mare or in a scarp. The word is used in the approved name of such a feature on the Moon. (Latin: bay)

Sinus

 

in anatomy, a cavity, protrusion, or long closed channel. In vertebrates (including man), the term “sinus” refers to a channel filled with venous blood in the dura mater. The cavity in some cranial bones is also called a sinus. [23–1297–]

sinus

[′sī·nəs]
(biology)
A cavity, recess, or depression in an organ, tissue, or other part of an animal body.

sinus

1. Anatomy
a. any bodily cavity or hollow space
b. a large channel for venous blood, esp between the brain and the skull
c. any of the air cavities in the cranial bones
2. Pathol a passage leading to a cavity containing pus
3. Botany a small rounded notch between two lobes of a leaf, petal, etc.
4. an irregularly shaped cavity
References in periodicals archive ?
Characteristically they arise from lateral nasal wall near the middle turbinate and extend into sinuses usually involving the maxillary and ethmoid sinuses.
The ethmoid sinuses are divided into groups of cells by bony basal lamellae of the middle turbinate, which separate the ethmoid into anterior and posterior groups with different drainage patterns.
If there was abnormality in ethmoid sinuses then Caldwell view was performed by using an occipitofrontal beam while the nose and forehead were in contact with the film.
Indications for the surgical treatment of osteomas of the frontal and ethmoid sinuses. Clin Otolaryngol Allied Sci.
* Since the ethmoid sinuses are near the tear ducts in the corner of the eyes, inflammation of these cavities often causes swelling of the eyelids and tissues around your eyes, and pain between your eyes.
Computed tomography (CT) of the sinuses demonstrated left-sided pansinusitis with complete opacification of the maxillary and ethmoid sinuses. There was expansion of the ostiomeatal complex, with bony erosion of the ethmoid and medial wall of the maxillary sinus, along with the soft tissue obstructing the nasal cavity (figure, B).
(2) These include: the infundibular pattern, with inflammation of the maxillary sinus and opacification of the ipsilateral ostium and infundibulum; the ostiomeatal unit pattern, with inflammation of the ipsilateral maxillary, frontal and ethmoid sinuses and occlusion of the middle meatus (Figure 1); the sphenoethmoidal recess pattern, with obstruction of the sphenoethmoidal recess and inflammation of the ipsilateral posterior ethmoid and sphenoid sinuses; the sinonasal polyposis pattern, which is characterized by the diffuse presence of polyps in the paranasal sinuses and nasal cavity; and the sporadic pattern, also termed unclassifiable, which is diagnosed when there is random sinus disease not related to ostial obstruction or polyposis.
ETHMOID SINUS: The ethmoid sinuses begin to form in the third to fifth fetal months, when numerous separate evaginations arise from the nasal cavity.
These defects can now easily be accessed via endoscopic transnasal techniques, especially the cribriform plate, the roof of the ethmoid sinuses and the sphenoid sinus.
The ethmoid sinuses are closer to the nasal passages.
CT scan revealed swelling of the mucosa in the bilateral ethmoid sinuses and soft-tissue filling in the right sphenoid sinus (Figures 1(a) and 1(b)).