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Intracellular recordings from embryonic chick motoneurones in the isolated perfused spinal cord
Insights
Intracellular recordings of chick embryo motoneurones revealed low-amplitude action potentials. Spontaneous synaptic activity, including bursting depolarizations, may contribute to embryonic motility.
Area of Science:
- Neuroscience
- Developmental Biology
- Electrophysiology
Background:
- Motoneurones are crucial for motor control.
- Understanding embryonic development requires studying neuronal activity.
- Chick embryos provide a model for early neural development.
Purpose of the Study:
- To investigate the electrophysiological properties of chick embryo motoneurones.
- To characterize spontaneous synaptic activity in developing motoneurones.
- To explore the relationship between synaptic activity and embryonic motility.
Main Methods:
- Intracellular recording of motoneurone potentials in 13- to 18-day chick embryos.
- Evoked and spontaneous synaptic potential measurements.
- Analysis of action potential characteristics and postsynaptic potentials.
Main Results:
- Motoneurones exhibited low-amplitude action potentials (<40-45 mV) without overshoot.
- Pronounced evoked and spontaneous postsynaptic potentials were observed.
- Irregular miniature and bursting high-voltage spontaneous postsynaptic depolarizations were identified.
Conclusions:
- Spontaneous synaptic activity, particularly bursting depolarizations, is present in embryonic chick motoneurones.
- This activity is potentially linked to the mechanisms underlying spontaneous embryonic movement.
- Further research can elucidate the role of these synaptic events in motor pattern generation.
Abstract:
Potentials of 13- to 18-day chick embryo motoneurones were recorded intracellularly. Action potentials could be evoked by antidromic or direct stimulation of the cells, but the amplitudes were relatively low (less than 40-45 mV) and no overshoot or marked afterpotentials were observed. Pronounced evoked and spontaneous postsynaptic potentials were observed. Both irregular miniature and bursting high-voltage spontaneous postsynaptic depolarizations were present. The association of spontaneous action potentials with the latter type of spontaneous synaptic activity suggests its possible involvement in mechanisms of spontaneous embryonic motility.