The Thalamus by Edward G. Jones (auth.), Edward G. Jones (eds.)

By Edward G. Jones (auth.), Edward G. Jones (eds.)

It is now greater than fifty years when you consider that Sir Wilfrid Le Gros Clark (1932a) released his Arris and Gale lectures at the constitution and connections of the thalamus. This authoritative evaluate got here at a time while thalamic experiences have been passing from a descriptive to an experimental part and, in his overview, Le Gros Clark used to be capable of hide nearly each point of the association and improvement and masses of the comparative anatomy of the thalamus then recognized. it's also imminent a half-century due to the fact A. Earl Walker (1938a) wrote The Primate Thalamus, which used to be strongly experimental, yet with many medical in­ points of interest, and which he defined as "an try to elucidate the position of the thalamus in sensation. " The intervening years have visible released a couple of studies of con­ ferences on elements of thalamic association and serve as yet no monographs equivalent to these of Le Gros Clark or Walker. maybe this can be comprehensible whilst one considers, no longer quite a bit the enormity of the recent info which were extra, yet quite the emphasis upon person thalamic nuclei as parts of separate sensible platforms, no longer them all sensory. it really is most likely additionally precise to claim that stories within the commoner experimental animals reminiscent of the rat, cat, and monkey were so effective of their personal correct that there has been no interest in making an across-species synthesis.

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Extra resources for The Thalamus

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It consists of laminar and medial interlaminar nuclei which are parts of the dorsal thalamus and are collectively termed the dorsal lateral geniculate complex. Beneath them is the ventral lateral geniculate nucleus, lying within the optic tract (Figs. 1F-I) and more or less continuous with its two fellow components of the ventral thalamus, the reticular nucleus and the zona incerta (Figs. 1A-G). All three are separated from the dorsal thalamus by the external medullary lamina. Between the dorsal lateral geniculate nucleus and the reticular nucleus is a thin strip of cells, the perigeniculate nucleus.

Bars = mm. From material provided by Dr. A. L. Berman. 2. 1. (continued) 51 THE THALAMUS IN REPRESENTATIVE MAMMALS ,.. 1. 1. 1. (continued) 54 CHAPTER 2 (ventral posterolateral or external) subnucleus and a medial (ventral posteromedial or arcuate) subnucleus (Fig. 1E). Medially, at levels posterior to the medioventral nuclei, is the ventral medial complex which consists of a principal ventral medial nucleus, an indistinct submedial nucleus, and a basal ventral medial nucleus (Figs. 1C-F). Posteriorly, the ventral nuclei give place to the medial geniculate complex of nuclei with an intervening, somewhat ill-defined region referred to as the posterior complex (Figs.

Le Gros Clark, 1932a). Kappers et al. (1936), in their frequently referenced book of comparative neuroanatomy, regarded ventral thalamus and subthalamus as synonyms but included parts of the midbrain in the region (the red nucleus, subthalamic nucleus, entopeduncular nucleus, substantia nigra), along with the zona incerta, fields of Forel, and the ventral lateral geniculate nucleus; but they excluded the reticular nucleus. This reflects some of the confusion surrounding the use of the two terms.

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