emissary vein

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Related to Emissary veins: cavernous sinus


a vessel through which blood passes from various organs or parts back to the heart, in the systemic circulation carrying blood that has given up most of its oxygen. Veins, like arteries, have three coats: an inner coat (tunica intima), middle coat (tunica media), and outer coat (tunica externa); however, in veins these are less thick and collapse when the vessel is cut. Many veins, especially superficial ones, have valves formed of reduplication of their lining membrane. See Appendix 2-6 and see also Plates.
afferent v's veins that carry blood to an organ.
allantoic v's paired vessels that accompany the allantois, growing out from the primitive hindgut and entering the body stalk of the early embryo.
cardinal v's embryonic vessels that include the pre- and postcardinal veins and the ducts of Cuvier (common cardinal veins).
emissary vein one passing through a foramen of the skull and draining blood from a cerebral sinus into a vessel outside the skull. See anatomic Table of Veins in the Appendices.
postcardinal v's paired vessels in the early embryo that return blood from regions caudal to the heart.
precardinal v's paired venous trunks in the embryo cranial to the heart.
pulp v's vessels draining the venous sinuses of the spleen.
subcardinal v's paired vessels in the embryo, replacing the postcardinal veins and persisting to some degree as definitive vessels.
sublobular v's tributaries of the hepatic veins that receive the central veins of hepatic lobules.
supracardinal v's paired vessels in the embryo developing later than the subcardinal veins and persisting chiefly as the lower segment of the inferior vena cava.
thebesian v's smallest cardiac veins; see anatomic Table of Veins in the Appendices.
trabecular v's vessels coursing in splenic trabeculae, formed by tributary pulp veins.
varicose v's see varicose veins.
vitelline v's veins that return the blood from the yolk sac to the primitive heart of the early embryo.

em·is·sar·y vein

one of the channels of communication between the venous sinuses of the dura mater and the veins of the diploë and the scalp.
See also: condylar emissary vein, mastoid emissary vein, occipital emissary vein, parietal emissary vein.
Synonym(s): vena emissaria [TA], emissarium, emissary (2)

em·is·sa·ry vein

(em'i-sar-ē vān) [TA]
One of the channels of communication between the venous sinuses of the dura mater and the veins of the diploë and the scalp.
Synonym(s): emissary (2) .

em·is·sa·ry vein

(em'i-sar-ē vān) [TA]
A communicating channel between venous sinuses of dura mater and veins of diploë and scalp.
References in periodicals archive ?
Nevertheless, it is important to emphasize that, according to Lanzieri et al., in the absence of the FV, the emissary vein may become contained in the foramen ovale.
Emissary veins apparently served double duty in the gracile-Homo lineage, says Falk, by helping to drain blood out of the cranium and by cooling the brain when vigorous exercise or heat exposure warnmed up blood flowing into cerebral tissue.
Cabanac and Brinnel placed the tips of ultrasonic probes on the heads of bald male volunteers at sites where emissary veins poke thorugh their tiny cranial conduits.
Since the few emissary veins with impressions remaining on fossil skulls link up to an extensive network of microscopic veins in the cranium, Cabanac and Brinnel's data support her theory that a venous "radiator" cools the human brain, Falk says.
Sustained exercise on the savanna helped to promote the evolution of brain-cooling emissary veins, as well as copious sweat glands in the face and scalp, dark skin and reduced body hair, she notes.
They opine that asymmetry of foramen Vesalius is due to pathologic conditions like invasion by nasopharyngeal melanoma, angiofibroma and carotid-cavernous fistula with drainage through the sphenoidal emissary vein in foramen Vesalius.
There was statistically significant difference in the incidence of dehiscent sigmoid plate ( P = 0.000), lateral sinus stenosis ( P = 0.014), high jugular bulb ( P = 0.000), sigmoid sinus diverticulum ( P = 0.000), jugular bulb diverticulum ( P = 0.000), dehiscent jugular bulb ( P = 0.000), and large emissary vein ( P = 0.006) between the symptomatic and asymptomatic sides [Table 2].
[sup][2],[27] The vascular anomalies and variants detected in this study are all factors potentially capable of changing normal perfusion (such as a dehiscent sigmoid plate, lateral sinus stenosis, sigmoid sinus diverticulum or jugular bulb diverticulum, large emissary vein, petrosquamosal sinus, and sinus thrombosis) or sound transmission (such as a dehiscent sigmoid plate and dehiscent jugular bulb).
Pulsatile tinnitus caused by a dilated mastoid emissary vein. J Korean Med Sci 2013;28:628-30.