PUBLICATION

A light and transmission electron microscope study of the distribution and ultrastructural features of peripheral nerve processes in the extra-retinal layers of the zebrafish eye

Authors
Chapman, G.B., Tarboush, R., Eagles, D.A., and Connaughton, V.P.
ID
ZDB-PUB-090309-8
Date
2009
Source
Tissue & Cell   41(4): 286-298 (Journal)
Registered Authors
Connaughton, Victoria P.
Keywords
TEM, Zebrafish, Peripheral nerve ultrastructure
MeSH Terms
  • Animals
  • Eye/innervation*
  • Microscopy
  • Microscopy, Electron, Transmission
  • Peripheral Nerves/ultrastructure*
  • Retina/ultrastructure
  • Zebrafish
PubMed
19251294 Full text @ Tissue Cell
Abstract
The distribution and ultrastructural features of peripheral nerve processes in the extra-retinal layers of the eyes of the zebrafish, Danio rerio (Hamilton), were investigated using light and transmission electron microscopy. A comparative study of the quality of preservation provided by three different fixation procedures revealed no consistently striking general differences. However, somewhat subjectively, the fixative containing Millonig's buffer did consistently provide better fixation of myelin. Overall, nerve processes, depending on the site studied, were distributed as either (1) bundles (in the choroid near the optic nerve head and in the choroid adjacent to the limbus), (2) linear arrays (in the junction between the sclera and cartilage and in the choroid adjacent to the retina) or (3) individual units (in the choroid under the cartilage or in the sclera). Both myelinated and unmyelinated processes were identified in these locations. Myelinated processes usually contained both neurofilaments and neurotubules, but a few apparently contained only neurofilaments. Unmyelinated processes usually contained mainly neurotubules, but a few apparently contained only neurofilaments. Taken together, these findings indicate innervation of extra-retinal structures, as seen in zebrafish, is highly conserved among vertebrates, further supporting the use of zebrafish as a model for the vertebrate visual system.
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