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The interstitial nucleus of the superior fasciculus, posterior bundle (INSFp) in the guinea pig: Another nucleus of the accessory optic system processing the vertical retinal slip signal

Published online by Cambridge University Press:  02 June 2009

C. Benassi ,
G. P. Biral ,
F. Lui ,
C. A. Porro  and
R. Corazza
C. Benassi
Affiliation:
Istituto di Fisiologia Umana, Universita' di Modena, Modena, Italia
G. P. Biral
Affiliation:
Istituto di Fisiologia Umana, Universita' di Modena, Modena, Italia
F. Lui
Affiliation:
Istituto di Fisiologia Umana, Universita' di Modena, Modena, Italia
C. A. Porro
Affiliation:
Istituto di Fisiologia Umana, Universita' di Modena, Modena, Italia
R. Corazza
Affiliation:
Istituto di Fisiologia Umana, Universita' di Modena, Modena, Italia
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Abstract

As in rabbit, gerbil, and rat, the guinea pig interstitial nucleus of the superior fasciculus, posterior bundle (INSFp) is a sparse assemblage of neurons scattered among the fibers forming the fasciculus bearing this name. Most of the INSFp neurons are small and are ovoid in shape. Interspersed among these, are a few larger, elongated neurons whose density becomes greater and whose shape becomes fusiform in correspondence to the zone of transition from the superior fasciculus to the ventral part of the medial terminal nucleus (MTN). Like the MTN, the INSFp is activated by retinal-slip signals evoked by whole-field visual patterns moving in the vertical direction, as shown by the increase of 14C-2-deoxyglucose (2DG) uptake into this nucleus. At the same level of luminous flux, neither pattern moving in the horizontal direction nor the same pattern held stationary can elicit increases in the INSFp 2DG assumption. The specificity of the observed increases in metabolic rates in INSFp following vertical whole-field motion suggests that this assemblage of neurons relays visual signals used in the control of vertical optokinetic nystagmus.

Keywords

Interstitial nucleus of the superior fasciculus posterior bundleRetinal slip14C-2-deoxyglucoseGuinea pigAccessory optic system
Type
Research Article
Information
Visual Neuroscience , Volume 2 , Issue 4 , April 1989 , pp. 377 - 382
Copyright
Copyright © Cambridge University Press 1989

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