NDLI: The postnatal development of the optic nerve of a reptile (Vipera aspis): a quantitative ultrastructural study

Content Provider	Springer Nature Link
Author	Bennis, M. Repérant, J. Ward, R. Rio, J. P. M’hamed, S. Ba Jay, B.
Copyright Year	2006
Abstract	The number of axons in the optic nerve of the ovoviviparous reptile Vipera aspis was estimated from electron micrographs taken during the first 5 weeks of postnatal life. One to two days after birth, the optic nerve contains about 170,000 fibres, of which about 9% are myelinated. At the end of the fifth postnatal week, the number of optic fibres has fallen to about 100,000, of which about 42% are myelinated. This fibre loss continues after the fifth postnatal week, since in the adult viper the nerve contains about 60,000 fibres, of which 85% are myelinated; overall, about 65% of the optic nerve fibres present at birth disappear before the number of axons stabilises at the adult level. This study shows, for the first time, that the mode of development of the visual axons of reptiles is not that of anamniote vertebrates but similar to that of birds and mammals.
Starting Page	691
Ending Page	705
Page Count	15
File Format	PDF
ISSN	03402061
Journal	Anatomy and Embryology
Volume Number	211
Issue Number	6
e-ISSN	14320568
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-11-03
Publisher Place	Berlin/Heidelberg
Access Restriction	Subscribed
Subject Keyword	Reptiles Visual system Development Optic nerve Myelinisation Loss of axons Neurology Cell Biology Neurosciences
Content Type	Text
Resource Type	Article
Subject	Anatomy Cell Biology Developmental Biology Embryology

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The postnatal development of the optic nerve of a reptile (Vipera aspis): a quantitative ultrastructural study