Plasticity in the Somatosensory System of Developing and by Peter J. Snow BSc, PhD, Peter Wilson BSc, PhD (auth.)

By Peter J. Snow BSc, PhD, Peter Wilson BSc, PhD (auth.)

Rarely have the various mechanisms that will underlie neural plasticity been tested as explicitly as they're during this large, lavishly illustrated remedy of plasticity within the somatosensory procedure. The reader is supplied with cutting-edge wisdom of connections in any respect degrees of the somatosensory method. The authors research the propensity for alterations of connectivity in either the mature and constructing mammal and clarify proposals in regards to the mechanisms underlying those alterations. Their sensible value to appropriate psychophysical and neurological observations can also be discussed.

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Extra info for Plasticity in the Somatosensory System of Developing and Mature Mammals — The Effects of Injury to the Central and Peripheral Nervous System

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Absence of sprouting by type I mechanoreceptive afferents into denevated skin of the adult cat. a Drawing of typical sensory nerve distributions on the thigh of the cat determined by electrophysiological recording from whole nerves. FC, femoral cutaneous nerve field; PFC, posterior femoral cutaneous nerve field; LFC, lateral femoral cutaneous nerve field; AC, accessory sural nerve field; A,B,C,D, fields of unnamed nerves. b, c Maps of the touch domes and their innervation determined by electrophysiological recording from the FeN and surrounding nerves, on the border of the peripheral field ofthe FeN.

The evidence for lack of sprouting of large myelinated afferent fibres does head of tibia greater auricular nerve field right leg left ear a b Fig. 3 a, b. Absence of sprouting by low-threshold mechanoreceptive afferents into denervated areas of skin in the adult rabbit. The low-threshold mechanosensory receptive fields of the sural and lesser sural nerves in the leg (a) and of the greater auricular and occipital nerves in the ear (b) were mapped by electro physiological recording from the whole nerve.

Initially Brenan (1983,1986) showed that peptidecontaining C fibres of the rat saphenous nerve undergo a limited sprouting into adjacent denervated skin within about 3 weeks of transection of the sciatic nerve. The presence of these fibres was detected by the method of plasma extravasation in response to their antidromic activation. It is well known that C fibres contribute to the nociceptive innervation of skin (Bessou and Perl 1969; Van Hees and Gybels 1972), and behavioural evidence for the sprouting of thermal nociceptors into denervated skin on the rat's back has now been obtained by mapping the zone from which noxious thermal stimulation elicited reflex contraction of the cutaneus trunci muscle (Doucette and Diamond 1987).

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