Difference between revisions of "File:Nanagas1925-fig01a.jpg"

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==Fig. 1a. Anencephalic Acranius==
 
==Fig. 1a. Anencephalic Acranius==
  
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(Anencephalic acrania)
  
* '''b''' - anencephalic craniorhachischisis
+
In these cases the whole cranial vault, together with the encephalon, is wanting. The flattened base of the cranium is covered by a membrane that varies in texture from a thin semitransparent sheet to an opaque scalp-like epidermal covering. When this covering is thin, it is markedly vascular, closely resembling the cerebral meninges, and the line of union between it and the normal skin of the face and neck is very distinct. When the covering is opaque and epidermal in character there is no such line of transition into the surrounding normal skin. In the former condition this covering is loose and irregularly folded, while in the latter it is generally thick and tense. fifteen of the fifty-seven cases in the series were of this type (26.3 per cent).
* '''c''' - microcephalic acrauius
 
* '''d''' - microcephalic craniorhnrhisehisis
 
* '''e''' -  exocephalic acranius
 
  
 
{{Nanagas1925 figures}}
 
{{Nanagas1925 figures}}

Latest revision as of 13:46, 16 September 2015

Fig. 1a. Anencephalic Acranius

(Anencephalic acrania)

In these cases the whole cranial vault, together with the encephalon, is wanting. The flattened base of the cranium is covered by a membrane that varies in texture from a thin semitransparent sheet to an opaque scalp-like epidermal covering. When this covering is thin, it is markedly vascular, closely resembling the cerebral meninges, and the line of union between it and the normal skin of the face and neck is very distinct. When the covering is opaque and epidermal in character there is no such line of transition into the surrounding normal skin. In the former condition this covering is loose and irregularly folded, while in the latter it is generally thick and tense. fifteen of the fifty-seven cases in the series were of this type (26.3 per cent).


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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)
Links: Fig 1. Anencephalus types | Fig 1a. anencephalic acranius | Fig 1b. anencephalic craniorhachischisis | Fig 1c. microcephalic acrauius | Fig 1d. microcephalic craniorhachischisis | Fig 1e. exocephalic acranius | Fig 16. anencephalic and normal fetuses | Historic Embryology Papers | Neural Abnormalities | Folic Acid and Neural Tube Defects | Skull Development


Reference

Nañagas JC. A comparison of the growth of the body dimensions of anencephalic human fetuses with normal fetal growth as determined by graphic analysis and empirical formulae. (1925) American J. Anatomy. 455-494.



Cite this page: Hill, M.A. (2019, October 13) Embryology Nanagas1925-fig01a.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Nanagas1925-fig01a.jpg

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