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 ?
They are a normal variant which must be differentiated from dermal sinus tracts which occur at a higher spinal level.
11] Mesodermal and epidermal tissue fill the space left vacant by incomplete neurulation and result in such abnormalities as a dermal sinus tract, lipomyelomeningocele, diastematomyelia, and tight filum terminale, all associated with spina bifida occulta.
Dermal sinus tracts (Fig 3) (sacral dimple): an epithelial lined tract that may open through the dura and into the spinal cord
A guide to the pathologies that develop at different embryological stages Gastrulation Primary neurulation Split cord Spinal lipoma--premature malformation--duplicated dysjunction and mesoderm notochord migration Neurenteric cysts--failure Dermal sinus track--late of notochord precursor dysjunction integration Gastrulation Secondary neurulation Split cord Thick filum--failure of malformation--duplicated terminal mass regression (Fig.