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  • 1
    Electronic Resource
    Electronic Resource
    Thalamic projections to the posterior sylvian and posterior ectosylvian gyri of the sheep brain, revealed with the retrograde transport of horseradish peroxidase (1986)
    Springer
    Anatomy and embryology 175 (1986), S. 77-90 
    Details
    ISSN: 1432-0568
    Keywords: Auditory cortex ; Thalamus ; Thalamocortical connections ; Horseradish peroxidase ; Sheep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The auditory area of the sheep cerebral cortex was studied on the basis of its afferents from the medial geniculate nucleus, traced with the horseradish peroxidase retrograde transport method. The results show that the medial geniculate nucleus projects only to the anterior parts of the posterior ectosylvian gyrus and the posterior sylvian gyrus. A small area of the posterior ectosylvian gyrus receives afferents exclusively from the ventral part of the medial geniculate nucleus, while the anterior part of the posterior sylvian gyrus receives also afferents from the posterior nucleus of the thalamus and the pulvinar. In addition, it was found that the medial part of the medial geniculate nucleus projects in a sparse way to the auditory cortex. The middle part of the posterior ectosylvian gyrus receives afferents from the posterior nucleus of the thalamus, the suprageniculate nucleus and the pulvinar, while the posterior part of the posterior ectosylvian gyrus together with the posteriormost part of the posterior sylvian gyrus receive afferents from the pulvinar. Finally, the area located between the anterior and the posteriormost part of the posterior sylvian gyrus receives afferents from both the posterior nucleus of the thalamus and the pulvinar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315458
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Postnatal development of somatostatin-containing neurons in the visual cortex of normal and dark-reared rats (1993)
    Springer
    Experimental brain research 92 (1993), S. 473-478 
    Details
    ISSN: 1432-1106
    Keywords: Somatostatin ; Visual deprivation ; Cortical areas 17, 18, 18a ; Transience ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The distribution of somatostatin (SRIF)-immunoreactive neurons in the visual cortical areas 17, 18 and 18a of Wistar rats from birth to adulthood was followed in both normal and dark-reared animals. The SRIF neurons show difference in distribution amongst the three cortical areas studied as early as the first postnatal week. Area 17 was distinguished by fewer SRIF cells in the upper layers (I–III), which results in a lower overall density. The SRIF neurons in all areas appeared to increase in numbers up to about 3 weeks and then decline dramatically to adult levels, which were 14–19% of the peak levels. Although this decline was still obvious, it moderated to 25–31% in dark-reared animals. The greatest effect was seen in area 18 where, at 60 days of age, there were twice as many SRIF cells in darkreared as in normal controls. It is suggested that, under conditions of dark rearing, the overall pattern of development of SRIF neurons, being uninfluenced by extrinsic factors, reveals the cells' genetic potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229035
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    Paper (German National Licenses)
    Fulltext
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