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The Barrel Cortex of Rodents (Paperback, Softcover reprint of the original 1st ed. 1995)
Loot Price: R5,654
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The Barrel Cortex of Rodents (Paperback, Softcover reprint of the original 1st ed. 1995)
Series: Cerebral Cortex, 11
Expected to ship within 10 - 15 working days
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The barrel area is a unique specialization of the cerebral cortex,
shared by many species of rodents and some marsupials, in which the
somatotopic map of the body surface receives direct morphological
expression. Here, the homogeneous sheet of layer IV granule cells
seen in most mammals is fractured into large archipelagos, each
representing one of the larger subdivisions of the contra lateral
half-body. Within these larger domains are smaller aggregates of
granule cells that contain the concentrated terminations of
thalamocortical fibers bear ing messages emanating from
constellations of receptors located in finer subdi visions of a
body part. These smaller aggregates are particularly well-defined
in the representation of the face, where they form a one-to-one
representation of the sinus hairs or vibrissae and where they have
been given the name barrels. The first inklings of the unique
structure of the parietal cortex of rodents came in the study of
Droogleever-Fortuyn (1914), who remarked on the pres ence in it of
clouds of granule cells 0. 5-1 mm in diameter, which he thought
were in some way associated with concentrations of nerve fibers.
Little attention, however, was paid to his observations. Lorente de
N 6 (1922) later observed dense focal concentrations of afferent
fiber ramifications in Golgi preparations of the mouse cortex,
calling them glomeruli, and these can now be seen as the structures
that form the hearts of the barrels and around which the granule
cells concentrate.
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