Author: A. Sousa-PintoPublisher: Springer Science & Business Media
ISBN: 364295247X
Category : Science
Languages : en
Pages : 43
Book Description
Monakow (1882) recognized in the medial geniculate body (MGB) a medial or "magnocellular", and a lateral, "principal" or parvicellular part. The latter was further subdivided by Cajal (1902) in a dorsal and a ventral lobe. Monakow's division was adopted by Rioch (11:)29) and has been widely used. Morest (1964), in a Golgi study in the cat, used Cajal's scheme and further subdivided the ventral division into several subnuclei. Morest considered Cajal's suprageniculate nucleus as apart of the MGB. The cortical projections of the MGB in the cat were studied by Woollard and Harpman (1939) and Ades (1941) with the Marchi method and, more recently, by Wilson and Gragg (1969) using the Nauta method. While all these studies show MGB projections to the first auditory area (AI) as electrophysiologically defined (Woolsey, 1960), there is disagreement as to the existence and extent of MGB projections to other cortical areas (All, AIll, Ep, Ea and SF of Woolsey, 1960) where auditory activity has been electrophysiologically demonstrated. These studies did not disclose topical relationships between the different subdivisions of the principal MGB and the various cortical projection areas.