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- W2170455753 abstract "Two cell types can be distinguished with intracellular recording from the pars intercerebralis of the American cockroach (Periplaneta americana). The first type, which corresponds morphologically to the medial neurosecretory cell, always had spontaneously occurring, overshooting action potentials. These action potentials are probably endogenously produced. Tetrodotoxin experiments revealed that sodium is the dominant ion of the action potential. The action potentials are followed by a relatively long after-hyperpolarization. The input resistance of these cells ranged from 120 to 390 MΩ. A mathematical model, based on cellular morphology and response to current pulses, revealed a membrane time constant of about 100 msec and an exonal:somatic conductance ratio of approximately 13. Area-specific membrane resistance was estimated at 33 kΩ cm2. These cells also often had reversible and spontaneous inhibitory postsynaptic potentials. The second cell type, which is non-neurosecretory, never produced spontaneous action potentials and rarely had synaptic potentials. Action potentials could be evoked by current injection into the cell body or by extracellular stimulation of their axons in the posteroventral portion of the the protocerebrum. These action potentials also depend on sodium ions. Their input resistance ranged from 16 to 35 MΩ. They had a membrane time constant of approximately 15 msec and an axonal:somatic conductance ratio of about 9. Their area specific membrane resistance was estimated at 14 kΩ cm2." @default.
- W2170455753 created "2016-06-24" @default.
- W2170455753 creator A5046783304 @default.
- W2170455753 date "1985-05-01" @default.
- W2170455753 modified "2023-09-25" @default.
- W2170455753 title "Electrophysiology of identified neurosecretory and non-neurosecretory cells in the cockroach pars intercerebralis" @default.
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- W2170455753 doi "https://doi.org/10.1002/jez.1402340206" @default.
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