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 ?
MR imaging revealed venous infarction in the bilateral thalamus, para-ventricle, and corpus callosum as well as occlusion of superior sagittal sinus, straight sinus, and bilateral transverse sinus.
Unilateral Transverse Sinus Stenting of Patients with Idiopathic Intracranial Hypertension AJNR Am J Neuroradiol2010; 31: 645-50.
Cranial MRI showed new significant ring-enhancing lesions in the right temporal lobe (Figure 1B) and MR venography demonstrated recanalization in the right transverse sinus (Figure 1D).
Venography revealed a thrombosed straight sinus, left transverse sinus, and sigmoid sinus (Fig 3).
Magnetic resonance venography revealed bilateral transverse sinus stenosis [Figure 1]a.
Another entity to be excluded is the transverse sinus thrombosis.
A PSS is an emissary vein of the posterior fossa that courses along the petrosquamosal junction, connecting the sigmoid or transverse sinus with the extracranial venous system.
Topographically, the most frequent involvement was transverse sinus in 40 (78.
The transverse-sigmoid sinus junction was defined as the transitional zone where the transverse sinus ended by the vertical descending segment of the sigmoid sinus viewed from the inside of the cranium.
Magnetic resonance venography demonstrated an absence of signal in the sigmoid sinus, the left jugular vein and, to a lesser degree, the transverse sinus on the left (figure 2, B).

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