sinus

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Related to ethmoidal sinus: Sphenoid sinus

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 ?
Per operatively greenish brown mucopurulent debris was seen in the maxillary sinus, anterior ethmoidal sinus. The characteristic "Allergic mucin" was seen.
Also noted were extension of the lesion into sellar, right parasellar, suprasellar, right ethmoidal sinus, bilateral sphenoidal sinses, temporal and infratemporal regions.
There was however a definite collection within the ethmoidal sinus on one side in the latter and the biochemical examination of the nasal fluid was suggestive of CSF.
Among 9 (64.28%) patients with neoplasms, 3 (21.42%) had ethmoidal sinus tumours, 2 (14.28%) had squamous cell carcinoma of ethmoid sinus, while one patient (7.14%) had malignant melanoma of ethmoidal sinus.
DT -Malignant peripheral nerve sheath tumour of the Ethmoidal sinus: Arch otolaryngol Head and neck surg:1997: 123; 654-657.