open access

Vol 59, No 4 (2000)
ORIGINAL ARTICLES
Published online: 2000-08-02
Submitted: 2012-02-06
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The neuronal structure of the substantia nigra in the guinea pig: Nissl and Golgi study

Krystyna Bogus-Nowakowska, Stanisław Szteyn, Anna Robak
Folia Morphol 2000;59(4):271-277.

open access

Vol 59, No 4 (2000)
ORIGINAL ARTICLES
Published online: 2000-08-02
Submitted: 2012-02-06

Abstract

The studies were carried out on the mesencephalons of adult guinea pigs. The preparations were made by means of the Golgi technique, as well as the Nissl and Klüver-Barrera methods. Four types of neurons were distinguished in the substantia nigra (SN) of the guinea pig:
1. Bipolar neurons of two kinds: the neurons of the first kind have elongated, fusiform perikarya (25-40 µm), whereas the cells of the second kind have rounded and oval perikarya (15-22 µm). These neurons possess two dendritic trunks which arise from the opposite poles of the cell body and run for a relatively long distance. The bipolar neurons are the most numerous in the pars compacta of SN.
2. Triangular neurons with three primary dendrites arising conically from a perikaryon (20-35 µm). They are the most often observed type of neurons in the pars reticulata of SN.
3. Multipolar neurons with quadrangular or oval perikarya (22-35 µm) and 4-5 dendritic trunks which spread out in all directions.
4. Pear-shaped neurons (perikarya 15-25 µm), which have one or two primary dendritic trunks arising from one pole of the cell body. In all the types of neurons an axon originates either from the dendritic trunk or from the soma and is observed only in its initial segment.

Abstract

The studies were carried out on the mesencephalons of adult guinea pigs. The preparations were made by means of the Golgi technique, as well as the Nissl and Klüver-Barrera methods. Four types of neurons were distinguished in the substantia nigra (SN) of the guinea pig:
1. Bipolar neurons of two kinds: the neurons of the first kind have elongated, fusiform perikarya (25-40 µm), whereas the cells of the second kind have rounded and oval perikarya (15-22 µm). These neurons possess two dendritic trunks which arise from the opposite poles of the cell body and run for a relatively long distance. The bipolar neurons are the most numerous in the pars compacta of SN.
2. Triangular neurons with three primary dendrites arising conically from a perikaryon (20-35 µm). They are the most often observed type of neurons in the pars reticulata of SN.
3. Multipolar neurons with quadrangular or oval perikarya (22-35 µm) and 4-5 dendritic trunks which spread out in all directions.
4. Pear-shaped neurons (perikarya 15-25 µm), which have one or two primary dendritic trunks arising from one pole of the cell body. In all the types of neurons an axon originates either from the dendritic trunk or from the soma and is observed only in its initial segment.
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Keywords

substantia nigra; types of neurons; Golgi and Nissl pictures

About this article
Title

The neuronal structure of the substantia nigra in the guinea pig: Nissl and Golgi study

Journal

Folia Morphologica

Issue

Vol 59, No 4 (2000)

Pages

271-277

Published online

2000-08-02

Bibliographic record

Folia Morphol 2000;59(4):271-277.

Keywords

substantia nigra
types of neurons
Golgi and Nissl pictures

Authors

Krystyna Bogus-Nowakowska
Stanisław Szteyn
Anna Robak

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