In the brain information is coded into sequences of impulses which
are unit responses travelling from neurones or nerve cells along
nerve fibres. The neural code is equivalent to a Morse code of dots
only in a great variety of temporal patterns and with thousands of
connections in parallel. Fig. lA is a diagram of Figure 1: Drawing
of Four Neurones of the Cerebral Cortex. This shows the excitatory
synaptic connections set up by an input fibre from the thalamus
labelled (spec. aff. ), which is an enormous nucleus in the brain
that provides the principal inputs to the cerebral cortex. This
spec. aff. fibre branches profusely to make excitatory synapses on
the spiny stellate cell (Sst) and on one pyramidal cell (Pyr). All
three pyramidal cells receive on their spines excitatory synapses
from Sst, and there is a special excitatory structure, called by
Szentagothai a cartridge, formed by the synaptic endings on the
apical dendrites of two pyramidal cells. All three pyramidal cells
but not the Sst, send their axons out of the cerebral cortex as
shown by the lower projecting arrows. The upper inset shows an
enlargement of a spine synapse with synaptic vesicles in the
presynaptic ending and the spine arising from a dendrite. The lower
two insets show diagrammatically normal and hypertrophied spine
synapses. (SZENTAGOTHAI, 1978).
General
Imprint: |
Springer vs
|
Country of origin: |
Germany |
Series: |
Rheinisch-Westfalische Akademie der Wissenschaften |
Release date: |
1992 |
First published: |
1992 |
Authors: |
John C Eccles
|
Dimensions: |
244 x 170mm (L x W) |
Format: |
Paperback
|
Pages: |
19 |
Edition: |
1992 ed. |
ISBN-13: |
978-3-531-08392-6 |
Categories: |
Books >
Medicine >
General issues >
General
Promotions
|
LSN: |
3-531-08392-9 |
Barcode: |
9783531083926 |
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