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vascular fetal membrane that develops from the hindgut in embryonic higher vertebrates (reptiles, birds and mammals) allantois
rare malignant neoplasm arising from vascular tissue; usually occurs in the breast and skin and is believed to originate from the endothelial cells of blood vessels angiosarcoma
division of nonflowering plants characterized by rhizoids rather than true roots and having little or no organized vascular tissue and showing alternation of generations between gamete-bearing forms and spore-bearing forms; comprises true mosses (Bryopsid Bryophyta , division Bryophyta
formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth cambium
very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois chorioallantoic membrane , chorioallantois
vascular plexus of the cerebral ventricles that regulate intraventricular pressure choroid plexus , plexus choroideus
highly vascular membrane in the eye between the retina and the sclera choroid , choroid coat
whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs class Psilopsida , class Psilotatae , Psilopsida , Psilotatae
deep vascular inner layer of the skin corium , derma , dermis
containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns; in some classifications considered a subdivision of Tracheophyta division Pteridophyta , Pteridophyta
seed plants; comprises the Angiospermae (or Magnoliophyta) and Gymnospermae (or Gymnospermophyta); in some classification systems Spermatophyta is coordinate with Pteridophyta (spore producing plants having vascular tissue and roots) and Bryophyta (spore division Spermatophyta , Spermatophyta
in former classifications: comprising plants with a vascular system including ferns and fern allies as well as seed plants division Tracheophyta , Tracheophyta
Finnish physician who first described vascular hemophilia (1870-1949) E. A. von Willebrand , Erik Adolf von Willebrand , Erik von Willebrand , von Willebrand , Willebrand
vascular membrane that lines the inner surface of long bones endosteum
vascular tissue capable of filling with blood and becoming rigid erectile tissue
any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores fern
unit strand of the vascular system in stems and leaves of higher plants consisting essentially of xylem and phloem fibrovascular bundle , vascular bundle , vascular strand
Devonian fossil plant considered one of the earliest forms of vascular land plants; similar to genus Rhynia but smaller genus Horneophyton , Horneophyton
vascular body in a mammalian ovary enclosing a developing egg Graafian follicle
severe recurring vascular headache; occurs more frequently in women than men hemicrania , megrim , migraine , sick headache
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