Ciba Foundation Symposium - The Spinal Cord by Ciba Foundation PDF

By Ciba Foundation

ISBN-10: 047071882X

ISBN-13: 9780470718827

ISBN-10: 0470722258

ISBN-13: 9780470722251

Chapter 1 Vice?Chairman's beginning comments (pages 1–2): G. L. Brown
Chapter 2 A Contribution from the learn of Cords of reduce types (pages 3–13): Theodore H. Bullock
Chapter three a few elements Regulating the shape and association of the Motoneurones of the Spinal twine (pages 14–23): D. H. Barron
Chapter four The Motor cellphone Groupings of the Spinal twine (pages 24–42): G. J. Romanes
Chapter five research of the Spinal wire Potentials in Leads from the twine Dorsum (pages 43–62): Carl Gustaf Bernhard
Chapter 6 A comparability of the Monosynaptic and Polysynaptic Reflex Responses of the Spinal twine lower than numerous affects (pages 63–77): Chandler McC. Brooks and Kiyomi Koizumi
Chapter 7 Strychnine Tetanus of the Spinal wire (pages 63–77): F. Bremer
Chapter eight a few Observations on Dorsal Root Potentials (pages 84–91): J. L. Malcolm
Chapter nine a few positive aspects of the Spinal Reflex Connections of Splanchnic Afferent Fibres (pages 92–98): C. B. B. Downman
Chapter 10 a few results of Repetitive Stimulation of Afferents on Reflex Conduction (pages 99–118): A. A. Jefferson and W. Schlapp
Chapter eleven Antidromic Propagation of Impulses into Motoneurones (pages 120–131): L. G. Brock, J. S. Coombs and J. C. Eccles
Chapter 12 Conduction of Impulses within the Neurons of the Oculomotor Nucleus (pages 132–179): R. Lorente de No
Chapter thirteen Disynaptic Reflex Linkage among convinced muscle tissue of the Hindlimb (pages 180–194): Yves Laporte
Chapter 14 a few results of Anticholinesterase at the Spinal wire of the Cat (pages 195–213): C. R. Skoglund
Chapter 15 neighborhood program of drugs to the Spinal wire (pages 214–221): D. W. Kennard
Chapter sixteen the results of shut Arterial Injections of Acetylcholine and Anticholinesterase at the task of the Cervical twine of the Cat (pages 222–230): W. Feldbebrg, J. A. B. grey and W. L. M. Perry
Chapter 17 The motion of d?Tubocurarine and Strychnine at the Spinal wire of the Cat (pages 231–246): D. Taverner
Chapter 18 Speculations at the Servo?Control of circulate (pages 247–260): P. A. Merton
Chapter 19 particular epidermis components for Excitation and Inhibition of Hindlimb Reflexes (pages 261–273): okay. E. Hagbarth
Chapter 20 Afferent apprehensive Connections of the Lateral Cervical Nucleus (pages 274–279): Bror Rexed and Gunnar Strom
Chapter 21 Nerve Conduction in Poliomyelitis (pages 280–292): Donal Brooks

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GRAY Copyright 0 1953 Ciba Foundation ANALYSIS OF T H E SPINAL CORD POTENTIALS I N LEADS FROM T H E CORD DORSUM CARL GUSTAF BERNHARD THISpaper deals with the cord dorsum response in relation to the peripheral source of afferent stimulation. Attention will mainly be directed to the analysis of the action potentials evoked by electrical stimulation of low threshold cutaneous fibres. Records were made of the reflex response in the ventral root as well as of the dorsal root potentials. Gasser and Graham (1933) and Hughes and Gasser (1934a and b ) found that the potentials from the cord dorsum, obtained within the entry zone of the dorsal root stimulated, start with an initial triphasic spike potential representing activity in the intraspinal dorsal root A fibres which run up in the dorsal column of the spinal cord.

52 CARL GUSTAFBERNHARD Intraspinal recordings with needle electrodes (see Bernhard, 1951) showed that the N, deflection is maximal in the dorsal grey matter within a region situated 1-2 mm. below the cord surface. Therefore it was concluded that a t least some fraction of the N, deflection originates from postsynaptic neurones which serve the transmission of the afferent inflow in coarse cutaneous fibres to suprasegmental levels. It is now time to return to the question of whether there is any dorsal root potential correlated to the N, deflection.

Less attention has been paid to the negative intermediary potential from the cord dorsum and the correlation between this deflection and a possible homologous dorsal root potential. The question was discussed by Lloyd and McIntyre (1949) in connection with their description of the DR IV deflection (preceding the DR V) following stimulation of dorsal roots. To this question I will return after describing our own results. Since in our experiments (Bernhard, 1952 ; Bernhard and Koll, 1952; Bernhard and WidCn, 1952) afferent fibres of different peripheral origins (muscle afferents and cutaneous afferents) were stimulated separately, the different deflections of the cord dorsum response are to be regarded as fractions of the composite response recorded in earlier investigations.

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Ciba Foundation Symposium - The Spinal Cord by Ciba Foundation

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