vein

1. any of the tubular vessels that convey oxygen-depleted blood to the heart

2. any of the hollow branching tubes that form the supporting framework of an insect's wing

3. any of the vascular strands of a leaf

4. a clearly defined mass of ore, mineral, etc., filling a fault or fracture, often with a tabular or sheetlike shape

5. a natural underground watercourse

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

vein

[vān]

(anatomy)

A relatively thin-walled blood vessel that carries blood from capillaries to the heart in vertebrates.

(botany)

One of the vascular bundles in a leaf.

(geology)

A mineral deposit in tabular or shell-like form filling a fracture in a host rock.

(invertebrate zoology)

One of the thick, stiff ribs providing support for the wing of an insect.

A venous sinus in invertebrates.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Vein

a mineral body filling a fissure in rock. Simple veins are single mineralized fissures; complex veins are clusters of interwoven fissures or of zones of fracturing or schist formation. According to their morphological details veins are called lenticular, chambered, saddle-reef, ladder, or feather. Veins that cut across the layers of enclosing rock are called intersecting veins; those that lie in conformity with the stratification and dip of the enclosing rock are called stratified. The length of veins of mineral products varies from 1 m or less to 200 km—for example, the veins of gold ore in California. In terms of dip some veins taper off close to the earth’s surface, and others, for example, the vein of the Kolar deposit in India, are worked at a depth of more than 3 km. A vein has a geological and a working thickness, the minimum thickness for exploiting the vein deposit. Depending on the value of the constituent minerals, the working thickness of a vein may vary from several centimeters to dozens of meters.

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References in periodicals archive

Nair, "Unilateral isolated superior ophthalmic vein thrombosis," Indian Journal of Ophthalmology, vol.

Whipple et al., "Spontaneous superior ophthalmic vein thrombosis: a rare entity with potentially devastating consequences," Eye, vol.

Opatowsky, "Bilateral cavernous sinus and superior ophthalmic vein thrombosis in the setting of facial cellulitis," Baylor University Medical Center Proceedings, vol.

MRI revealed enlargement of the L superior and inferior ophthalmic veins without contrast enhancement concerning for thrombosis (Figure 2).

Superior and Inferior Ophthalmic Vein Thrombosis in the Setting of Lung Cancer

Benabou, "Color Doppler imaging of the superior ophthalmic vein in patients with Graves' orbitopathy before and after treatment of congestive disease," Clinics, vol.

The Increment of Choroidal Thickness in Euthyroid Graves' Ophthalmopathy: Is It an Early Sign of Venous Congestion?

Carotid-cavernous fistulas: embolization through the superior ophthalmic vein approach.

Treatment of carotid-cavernous sinus fistulas using a detachable balloon catheter through the superior ophthalmic vein. Arch Ophthalmol.

Indications and techniques for primary embolization via the superior ophthalmic vein. Arch Ophthalmol.

Treatment of carotid-cavernous sinus fistulas using a superior ophthalmic vein approach.

Embolization of carotid cavernous fistulas via the superior ophthalmic vein. Aust N Z J Ophthalmol.

Operative approach via the superior ophthalmic vein for the endovascular treatment of carotid cavernous fistulas that fail traditional endovascular access.

Lessons learned from difficult or unsuccessful cannulations of the superior ophthalmic vein in the treatment of cavernous sinus dural fistulas.

Treatment of dural carotid-cavernous sinus fistula through the superior ophthalmic vein/Superior oftalmik ven yoluyla dural karotiko-kavernoz fistul tedavisi