open access

Vol 63, No 4 (2004)
ORIGINAL ARTICLES
Published online: 2004-09-16
Submitted: 2012-02-06
Get Citation

A morphometric study of the amygdala in the common shrew

Maciej Równiak, Stanisław Szteyn, Anna Robak
Folia Morphol 2004;63(4):387-396.

open access

Vol 63, No 4 (2004)
ORIGINAL ARTICLES
Published online: 2004-09-16
Submitted: 2012-02-06

Abstract

The characteristic features of the common shrew amygdala (CA), as shown by volumetric comparisons of the individual nuclei, are the poor development of the lateral (LA) and basomedial (BM) nuclei as well as the particularly strong formation of the basolateral (BL) and lateral olfactory tract (NLOT) nuclei. The central (CE), cortical (CO) and medial (ME) nuclei are also well organised in this species. All these features are even more distinctly visible when the total number of neurons in the nuclei referred to are compared. A comparison of the densities of neurons in the individual nuclei with the mean numerical density of cells in the CA indicates that there are the 3 different regions within the common shrew’s CA. The densities of neurons in the LA, BL, and BM are significantly lower than the mean density of cells in the CA (p < 0.05). In the CE this value does not differ from the mean (p > 0.05). In the CO, ME and NLOT the density values are significantly higher than the mean (p < 0.05). Furthermore, a similar division of the shrew’s CA can, to some extent, be performed using the size parameters of the amygdaloid neurons as a marker. Interestingly, the large neurons populate less densely organised CA areas like the LA, BL and BM, whereas the small cells populate the ME and NLOT, where the neurons are densely arranged. The CE and CO occupy intermediate positions, with the neurons similar in size to the mean for the shrew’s CA.

Abstract

The characteristic features of the common shrew amygdala (CA), as shown by volumetric comparisons of the individual nuclei, are the poor development of the lateral (LA) and basomedial (BM) nuclei as well as the particularly strong formation of the basolateral (BL) and lateral olfactory tract (NLOT) nuclei. The central (CE), cortical (CO) and medial (ME) nuclei are also well organised in this species. All these features are even more distinctly visible when the total number of neurons in the nuclei referred to are compared. A comparison of the densities of neurons in the individual nuclei with the mean numerical density of cells in the CA indicates that there are the 3 different regions within the common shrew’s CA. The densities of neurons in the LA, BL, and BM are significantly lower than the mean density of cells in the CA (p < 0.05). In the CE this value does not differ from the mean (p > 0.05). In the CO, ME and NLOT the density values are significantly higher than the mean (p < 0.05). Furthermore, a similar division of the shrew’s CA can, to some extent, be performed using the size parameters of the amygdaloid neurons as a marker. Interestingly, the large neurons populate less densely organised CA areas like the LA, BL and BM, whereas the small cells populate the ME and NLOT, where the neurons are densely arranged. The CE and CO occupy intermediate positions, with the neurons similar in size to the mean for the shrew’s CA.
Get Citation

Keywords

amygdala; common shrew; morphometric analysis; 3-D reconstructions

About this article
Title

A morphometric study of the amygdala in the common shrew

Journal

Folia Morphologica

Issue

Vol 63, No 4 (2004)

Pages

387-396

Published online

2004-09-16

Bibliographic record

Folia Morphol 2004;63(4):387-396.

Keywords

amygdala
common shrew
morphometric analysis
3-D reconstructions

Authors

Maciej Równiak
Stanisław Szteyn
Anna Robak

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