acrania
Complete or partial absence of a skull; associated with anencephaly. [G. a- priv. + kranion, skull]

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Acrania n pl in some classifications a division of the phylum or subkingdom Chordata comprising the hemichordates, tunicates, and lancelets and including all the chordates without true heads and anterior brains compare VERTEBRATA

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n.
congenital absence of the skull, either partial or complete, due to a developmental defect.

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acra·nia (ə-kraґne-ə) [a-1 + crani- + -ia] a developmental anomaly characterized by partial or complete absence of the cranium.

Medical dictionary. 2011.

Look at other dictionaries:

  • Acrania — A*cra ni*a, n. [NL., from Gr. a priv. + ? skull.] 1. (Physiol.) Partial or total absence of the skull. [1913 Webster] 2. pl. (Zo[ o]l.) The lowest group of Vertebrata, including the amphioxus, in which no skull exists. [1913 Webster] …   The Collaborative International Dictionary of English

  • Acrania — Acranĭa (lat.), Schädellose, s. Röhrenherzen …   Kleines Konversations-Lexikon

  • acrania — monstruosidad caracterizada por la falta total o parcial del cráneo [ICD 10: Q00.0] Diccionario ilustrado de Términos Médicos.. Alvaro Galiano. 2010 …   Diccionario médico

  • Acrania —   Plural, Unterstamm der Chordatiere, Schädellose.   …   Universal-Lexikon

  • Acrania — Acrania, Leptocardii, Cephalochordata, Schädellose, knapp 30 marine, getrenntgeschlechtige Arten umfassender Unterstamm der ⇒ Chordata. Bis 7 cm lang; fischähnlicher Körper ohne deutlichen Kopfabschnitt. Die Untersuchung des Lanzettfischchens ⇒… …   Deutsch wörterbuch der biologie

  • Acrania — vgl. Akranie …   Das Wörterbuch medizinischer Fachausdrücke

  • ACRANIA — (от греч. а отриц. част, и kranion череп), бесчерепные, подтип типа хордовых; по своей организации представляют много общего с позвоночными, хотя не имеют не только черепа и позвоночного столба, но и головного мозга, вместо которого имеется… …   Большая медицинская энциклопедия

  • acrania — s. f. Ausência de crânio.   ‣ Etimologia: a + grego kraníon + ia …   Dicionário da Língua Portuguesa

  • Acrania — Infobox Disease Name = PAGENAME Caption = DiseasesDB = ICD10 = ICD10|Q|00|0|q|00 ICD9 = ICD9|740.0 ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = Acrania is a cephalic disorder of a human fetus characterised by a partial or …   Wikipedia

  • Acrania — Schädellose Lanzettfischchen Branchiostoma lanceolatum Systematik Unterreich: Vielzellige Tiere (Metazoa) …   Deutsch Wikipedia

  • Acrania — A group of the phylum Chordata whose members possess a notochord, gill slits, and nerve cord but no vertebrae, ribs, or skull; e.g., Amphioxus, tunicates, and acorn worms. [G. a priv. + kranion, skull] * * * Acrania n pl in some classifications a …   Medical dictionary

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