Neurobiology Glossary
100 terms total — 24 showing — Last updated 15 Sep 2026
tetrodotoxin TTX
Potent neurotoxin that selectively blocks voltage-gated sodium channels, preventing action potential generation.
population vector
Mathematical representation of movement direction decoded from multiple motor cortex neurons.
postsynaptic density
Protein-rich region beneath the postsynaptic membrane containing receptors and signaling molecules.
presynaptic terminal
The endpoint of an axon containing synaptic vesicles and neurotransmitter release machinery.
receptive field
The specific region of sensory space where stimuli can influence a neuron's firing rate.
refractory period
The brief interval after an action potential during which a neuron cannot fire another action potential.
resting potential
The stable electrical charge across a neuron's membrane when the cell is not actively signaling.
retrograde signaling
Communication from postsynaptic to presynaptic neurons that modulates neurotransmitter release.
schaffer collateral
Axonal projections from hippocampal CA3 pyramidal neurons that synapse onto CA1 pyramidal neurons, forming a major hippo...
seizure focus
The specific brain region where abnormal electrical activity originates during an epileptic seizure.
sharp-wave ripple
A high-frequency oscillatory event in the hippocampus associated with memory consolidation during rest and sleep.
silent synapse
A synaptic connection containing only NMDA receptors, functionally inactive at resting potential but recruitable during...
somatotopy
Systematic spatial organization of neural representations that corresponds to the anatomical arrangement of body parts.
spike train
A sequence of action potentials recorded from a single neuron over time, appearing as discrete electrical events.
spike-timing-dependent plasticity
Form of synaptic plasticity where the relative timing of pre- and postsynaptic spikes determines synaptic strength chang...
spike-triggered average
Statistical method to determine the stimulus features that precede action potentials.
spiking neural network
A computational model that incorporates the timing of individual action potentials, unlike rate-based neural networks.
status epilepticus
A prolonged seizure or series of seizures lasting more than 30 minutes without recovery of consciousness, representing a...
stereotactic electroencephalography
An invasive technique using depth electrodes placed with stereotactic precision to record intracranial EEG for epilepsy...
stereotaxis
Three-dimensional coordinate system used to precisely locate structures within the brain for surgical or experimental pr...
synaptic cleft
The narrow gap between the presynaptic and postsynaptic neurons at a synapse.
synaptic plasticity
The ability of synapses to strengthen or weaken over time in response to activity patterns and experience.
temporal summation
Integration of multiple synaptic inputs arriving at a neuron within a short time window.
tetrodotoxin
Potent neurotoxin that selectively blocks voltage-gated sodium channels, preventing action potential generation.
theta rhythm
A prominent 4-12 Hz oscillation in the hippocampus associated with memory formation and spatial navigation.