aortic arches
aortic arches (arterial arches) Six pairs of arteries in vertebrate embryos, which connect the
ventral aorta to the
dorsal aorta by running between the gill slits. The arches are numbered I to VI from the anterior end. In adult tetrapods arches I and II are lost, III gives rise to the
carotid arteries, IV (one side of which is lost in birds and mammals) becomes the
systemic arch supplying the trunk and limbs, V is lost (see
ductus arteriosus), and VI gives rise to the pulmonary arch supplying the lungs (see
pulmonary artery). In adult fish four to six arches persist as branchial arteries supplying the gills.
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Helicon
Book article from: The Columbia Encyclopedia, Sixth Edition
Helicon , Gr. Elikón, mountain group...it rises to 5,736 ft (1,748 m). Helicon formed part of the border between ancient...and Aganippe are on the slopes of Mt. Helicon. The temple of the Muses was situated...
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helicon
Book article from: The Concise Oxford Dictionary of Music
helicon. Form of bass tuba made so that it may be wrapped round the player's body and rest on the shoulder (useful when played on the march). So called because of helical (spiral) shape. Largely displaced by modified version, sousaphone .
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Helicon Home Colony
Book article from: The Oxford Companion to American Literature
Helicon Home Colony, communal experiment founded at Englewood, N.J. (1906), by Upton Sinclair and some 40 associates, mostly young...
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Helicon, Mount
Book article from: The Oxford Dictionary of Phrase and Fable
Helicon, Mount a mountain in Boeotia, central Greece, to the north of the Gulf of Corinth, which was believed by the ancient Greeks to be the home of the Muses.
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Englands Helicon
Book article from: The Concise Oxford Companion to English Literature
Englands Helicon, a miscellany of Elizabethan verse, published in 1600, with additions in 1614. It is the best collection of lyrical and pastoral...
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