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Author Tömböl, T. ♦ Eyre, M. D. ♦ Alpár, A. ♦ Németh, A.
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©2005
Language English
Subject Domain (in DDC) Technology ♦ Medicine & health
Subject Keyword Nuclei isthmi ♦ Axon terminals ♦ Golgi ♦ BDA anterograde tracer ♦ GABA Immunogold labeling
Abstract The optic tectum is reciprocally connected to the nuclei isthmi pars magnocellularis (Imc) and pars parvocellularis (Ipc), which have different modulatory effects on optic transmission. We studied the axon arbourisation of these isthmic nuclei in the optic tectum in order to differentiate between them using Golgi-impregnated preparations both in chickens and pigeons. In addition, sections from animals injected with the anterograde tracer biotinylated dextran-amine (BDA) into the Imc were examined in the bright-field and electron microscope to identify the axon arbourisations and terminals. Also, GABA immunogold stained sections were examined in the electron microscope. In Golgi preparations, slab-like (or poplar tree-like) axon terminal arbourisations of both magnocellular and parvocellular isthmic nuclei neurons were found extending to the tectal surface, with similar branching patterns, but different lengths. The axon arbourisations extending from layer 5 of the optic tectum to the surface were termed type 1, whereas those extending from the internal (12–11) layers to the tectal surface were termed type 2. Type 2 arbourisations very closely matched arbourisations observed in BDA injected material, indicating that Imc neurons gave rise to type 2 arbourisations. The two kinds of axon arbourisation in the external tectal layers were alike in both types of bird, except for the width, which was about 10 μm larger in the type 2 axon arbour. Controlling for size, there was no significant difference between chicks and pigeons. The significance of these afferents in the optic tectum is discussed.
ISSN 03402061
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2005-04-28
Publisher Place Berlin/Heidelberg
e-ISSN 14320568
Journal Anatomy and Embryology
Volume Number 209
Issue Number 5
Page Count 10
Starting Page 371
Ending Page 380


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Source: SpringerLink