Acrania


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Related to Acrania: exencephaly

acrania

[ā′krān·ē·ə]
(medicine)
Partial or complete absence of the cranium at birth.

Acrania

[ā′krān·ē·ə]
(zoology)
A group of lower chordates with no cranium, jaws, vertebrae, or paired appendages; includes the Tunicata and Cephalochordata.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Acrania

 

a subphylum of lower chordate animals, as opposed to the subphylum of Craniata, or Vertebrata. Acrania have the following characteristics: the head section of the body is not separate; there is no skull (hence the name); the whole body is segmented, including some internal organs, the excretory system, and the sexual glands; the sensory organs are primitive (there are only sensory cells, lying in the skin and along the neural tube); and there is no heart, only a pulsating ventral blood vessel. There are two families. The family Branchiostomatidae includes 19 species, of which the best-known is the lancelet. The family Amphioxididae comprises three species. These three species are small (up to 1 cm) and live at great depths in the equatorial zone of the oceans.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Congenital cranial vault defects refer to conditions with similarly dismal prognoses, including exencephaly, anencephaly, acalvaria, and acrania [5].
Major anomalies included VM 95(52.2%) NTDs 31(17.03%) cisterna magna 17(9.34%) and acrania 12(6.6%) (Table-1).
Exencephaly is a congenital malformation along a spectrum that includes acrania and anencephaly (acrania-exencephaly-anencephaly sequence).
A trained clinician in fetal imaging may be able to identify acrania, anencephaly, and encephalocele, for example.
One-year-old Matthew Gillado, who was born to Isabela and Raven Gillado, suffers from acrania - a rare facial deformity that develops inside the fetus, and occurs in every 20,000 human babies.
Table 2: Type of Anomaly (n=62) Type of Anomaly Frequency Hydrocephalus 16 Anencephaly 14 Meningomyelocele 4 Encephalocele 6 CNS Anomalies, [49 (79%)] Hydroceph+meningomylocele 4 Anenceph+spinabifida 2Isolated Microcephalous 1Anomalies, [57(91.9%)] Acrania 1 Dandy walker malformation 1 Polyscystic kidneys 2 Renal Anomalies, [4 (6.5%)] Dysplastic Multicystic kidneys 2 Omphalocele 1 GIT Anomalies, [2 (3.2%)] Gastroschisis 1 Skeletal Anomalies, [2 (3.2%)] Achondroplasia 2 Mickel Gruber syndrome 2 Hydroceph, Omphalocele 1Complex Anomalies, [5 (8.1%)] Esophageal atresia, Renal anomlies 1 Facial abnormalities, Talipes, Esophageal 1 atresia, Renal agenesis
A 40-year-old woman at 16 weeks' gestation underwent D&E for fetal acrania diagnosed on ultrasound.
In addition to the CVS, the anatomical survey detected 2 fetuses with acrania, 2 with multi-structural abnormalities, and 4 with multi-structural abnormalities that were characteristic of trisomy 13, trisomy 18, trisomy 21 and Turner's syndrome, respectively.
After completing his National Service, Peter started out in racing with Billy Larkin at Gatwick, proceeding, via Jack Holt (for both of whom he rode winners), to Ryan Price, thence to Peter Thrale and Don Butchers and ultimately to Guy Harwood at Pulborough, for whom he was head man between 1966-75, in the years at Coombelands that featured Young Generation, Acrania, King Kathy, Jan Ekels and Call Of The Wild.