Electron microscopic identification of postsynaptic dorsal root terminals: a possible substrate of dorsal root potentials in the frog spinal cord

1977 ◽  
Vol 29-29 (3-4) ◽  
Author(s):  
G. Sz�kely ◽  
B. Kosaras
Keyword(s):  
Spinal Cord ◽  
Dorsal Root ◽  
Electron Microscopic ◽  
Microscopic Identification ◽  
Frog Spinal Cord ◽  
Dorsal Root Potentials ◽  
Electron Microscopic Identification

Recurrent dorsal root potentials and motoneuron morphology in the frog spinal cord

1990 ◽  
Vol 117 (3) ◽  
pp. 289-294 ◽  
Author(s):  
O.V. Shupliakov ◽  
M. Antal ◽  
G. Székely
Keyword(s):  
Spinal Cord ◽  
Dorsal Root ◽  
Frog Spinal Cord ◽  
Dorsal Root Potentials

Effects of synthetic buffers on reflexes in the isolated frog spinal cord

1975 ◽  
Vol 229 (3) ◽  
pp. 831-837 ◽  
Author(s):  
RA Davidoff ◽  
ES Sears
Keyword(s):  
Spinal Cord ◽  
Dorsal Root ◽  
Ringer Solution ◽  
Membrane Properties ◽  
Buffer System ◽  
Bicarbonate Buffer ◽  
Frog Spinal Cord ◽  
Dorsal Root Reflex ◽  
Dorsal Root Potentials

Substitution of synthetic buffers (Tris, TES, HEPES, or 3,3-dimethylglutarate) for CO2-bicarbonate buffer in Ringer solution perfusing the isolated in vitro frog spinal cord preparation altered membrane properties and reflex activity. Perfusion with Ringer solution gassed with O2 and containing synthetic bu,fers consistently produced a depolarization of motoneurons and dorsal root fibers, decreased the amplitude (and usually the duration) of ventral and dorsal root potentials, and had variable effects on motoneuron and dorsal root reflex discharges. With Tris-Ringer these discharges decreased in amplitude; with Ringer containing one of the other synthetic buffers, these discharges were augmented. All changes were reversible when the cord was returned to bicarbonate-buffered Ringer aerated with 95% O2/5% CO2. The use of a combined buffer system-one containing a synthetic buffer and bicarbonate-induced smaller or minimal changes in bioelectric activity. At present the data are insufficient to allow firm conclusions concerning the mechanisms underlying these results; but it is evident 1) that changes in PCO2 and bicarbonate concentration and 2) that the pharmacological properties of synthetic buffers are important variables.

Spontaneous dorsal root potentials arise from interneuronal activity in the isolated frog spinal cord

1984 ◽  
Vol 301 (2) ◽  
pp. 331-341 ◽  
Author(s):  
G.P. Ryan ◽  
J.C. Hackman ◽  
C.J. Wohlberg ◽  
R.A. Davidoff
Keyword(s):  
Spinal Cord ◽  
Dorsal Root ◽  
Frog Spinal Cord ◽  
Dorsal Root Potentials
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