Encyclopedia entry
Optic (CN II) Nerve
Abstract
In one study of 50 brains, the intracranial length of the nerve varied between 4.8 and 15.1 mm; the majority were 8-10mm. The optic chiasm may be absent. The optic nerves and tracts may be unequal on either side, or the nerve may be absent on either side. The optic nerves are occasionally doubled and "accessory" optic nerves have been reported. There are reports of the optic tract being directly joined to the peduncles cerebri and to the brain stem. The entire visual system has been reported absent in an adult.
In one study of 50 brains, the intracranial length of the nerve varied between 4.8 and 15.1 mm; the majority were 8-10mm. The optic chiasm may be absent. The optic nerves and tracts may be unequal on either side, or the nerve may be absent on either side. The optic nerves are occasionally doubled and "accessory" optic nerves have been reported. There are reports of the optic tract being directly joined to the peduncles cerebri and to the brain stem. The entire visual system has been reported absent in an adult.
Anatomy Atlases. Image hosted by the site it comes from. Open the original page.
Anatomy Atlases. Image hosted by the site it comes from. Open the original page.
Anatomy Atlases. Image hosted by the site it comes from. Open the original page.
Anatomy Atlases. Image hosted by the site it comes from. Open the original page.
Riferimenti dell’opera originale
Elenco riportato come compare nella fonte, senza normalizzazione dei formati bibliografici.
- Meyer, H. (1870) Eine historische Notiz über eine Varietät des N. opticus. Arch. Anat. Physiol. Wissen. Med. 1870:523-524.
- Spiller, W.G. (1902) A case of complete absence of the visual system in an adult. University of Pennsylvania Medical Bulletin, 14:448-453
- Weinberg, R. (1926) Ungekreutzte Sehnervenfasern. Z. Anat. Entwicklungsgesch. 79:433-446.
- Whitnall, S,E. (1932) The Anatomy of the Human Orbit, 2nd ed., Oxford University Press, London.
Anatomical classification
- Systems:
- Nervous system
Content provenance
Adaptation
Adaptation of «Optic (CN II) Nerve — Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System» by Ronald A. Bergman, Adel K. Afifi, Ryosuke Miyauchi. Source: https://www.anatomyatlases.org/AnatomicVariants/NervousSystem/Text/OpticNerve.shtml Original work distributed under the CC BY-NC-SA 4.0 licence (https://creativecommons.org/licenses/by-nc-sa/4.0/deed.it). Adaptation by Redazione AIVA. Changes from the original: Testo originale inglese riprodotto integralmente e riorganizzato nel formato scheda del portale (sintesi, testo, riferimenti), senza modificarne le affermazioni. La traduzione italiana non è ancora stata eseguita, e la pagina lo dichiara. Le figure non sono state copiate: sono collegate alla pagina d’origine. This publication is not approved or endorsed by the authors of the original work.
Licence
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