Overview

It is known that the medial geniculate body (MGB) is the last relay center in the audi- tory system. Its projections to the auditory cortex have been studied extensively in the cat using retrograde cell degeneration and the Marchi technique. The auditory cortex has also been defined electrophysiologically and cytoarchitecturally by many authors (Fig. 1). Woolsey and Walzl (1942) first defined the primary (AI) and secondary (All) auditory areas by electrical stimulation of cochlear nerve fibers. Later studies have dem- onstrated other cortical areas responsive to auditory stimulation: the posterior ecto- sylvian area (Ep), the suprasylvian fringe (SF), the third auditory'area (AlII) in the sec- ond somatic sensory area (SII), the insular area (Ins) or the fourth auditory area (AIV), and the temporal area (Temp). Classic anatomic methods, such as the Marchi and retrograde cell degeneration methods, were not suitable for studying the precise organization of the cortical pro- jections of MGB, however, the Nauta method has been useful in the study of these pro- jections (Wilson and Cragg, 1969; Niimi and Naito, 1972, 1974; Sousa-Pinto, 1973). These studies indicated that parts of MGB send differential projections to individual auditory areas, although considerable overlap of the projections is seen. Furthermore, some authors showed that the pulvinar nuclear group also projects to the auditory cor- tex (Graybiel, 1973; Niimi et aI. , 1974a; Rosenquist et aI. , 1974).

Full Product Details

Author:   Kahee Niimi ,  Hiroaki Matsuoka
Publisher:   Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
Imprint:   Springer-Verlag Berlin and Heidelberg GmbH & Co. K
Volume:   57
Dimensions:   Width: 17.00cm , Height: 0.30cm , Length: 24.40cm
Weight:   0.160kg
ISBN:  

9783540094494

ISBN 10:   3540094490
Pages:   58
Publication Date:   01 August 1979
Audience:   Professional and scholarly ,  Professional & Vocational
Format:   Paperback
Publisher's Status:   Active
Availability:   Out of stock  
The supplier is temporarily out of stock of this item. It will be ordered for you on backorder and shipped when it becomes available.

Table of Contents

1 Introduction.- 2 Material and Methods.- 3 Results.- 3.1 Cytoarchitectural Subdivision of MGB.- 3.2 Primary Auditory Area.- 3.3 Secondary Auditory Area.- 3.4 Suprasylvian Fringe.- 3.5 Dorsal Part of the Posterior Ectosylvian Area.- 3.6 Ventral Part of the Posterior Ectosylvian Area.- 3.7 Insulotemporal Area.- 3.8 Second Somatic Sensory Area.- 4 Discussion.- 4.1 Retrograde Axonal Transport of HRP.- 4.2 Primary Auditory Area.- 4.3 Secondary Auditory Area.- 4.4 Suprasylvian Fringe.- 4.5 Dorsal Part of the Posterior Ectosylvian Area.- 4.6 Ventral Part of the Posterior Ectosylvian Area.- 4.7 Insulotemporal Area.- 4.8 Second Somatic Sensory Area.- 5 Summary.- References.

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