Flashcards in Chapter 4,5,6 Vocab Deck (294)
Axonal conduction in the normal direction-from the cell body toward the terminal buttons
A reference point on the stereotaxic atlas, on top of the skull where two of the major sutures intersect.
Nodes of Ranvier
The gaps between adjacent myelin segments on an axon
Has two parts: head holder and the electrode holder. Electrode holder allows to be moved in the three dimensions: anterior-posterior, dorsal-ventral, and lateral-medial.
Conduction of an action potential from one node of Ranvier to the next along a myelinated axon
The cortical tissue is drawn off by suction through a fine-tipped handleheld glass pipette.
Diseases that damage the nervous system
Small subcortical lesions are made by this technique when high frequency current is passed through the target tissue from the tip of an electrode.
Neurons that synapse on skeletal muscles
Used to eliminate conduction in a nerve or tract. Tiny cut can accomplish this without extensive damage to surrounding tissue.
Passive and decremental conduction
When coolant is pumped through an implanted cryoprobe, neurons near the tip are cooled until they stop firing. No structural damage.
A mathematical model (a type of scientific model) that describes how action potentials in neurons are initiated and propagated. It is a set of nonlinear ordinary differential equations that approximates the electrical characteristics of excitable cells such as neurons and cardiac myocytes.
Probe in the cryogenic blockade technique
Tiny nodules of various shapes that are located on the surface of many dendrites and are the sites of most excitatory synapses in the mature mammalian brain
Lesions restricted to one half of the brain
Synapses of each terminal buttons on somas
Lesions that involving both sides of the brain
Types of synapse that is capable of transmission in either direction
Stimulates the brain through two insulated wires wound tightly together and cut at the end.
Types of synapse that helps mediate presynaptic facilitation and inhabitation
Intracellular Unit Recording
Provides a moment-by-moment record of the graded fluctuations in one neuron?s membrane potential
Axoaxonic synapses that increase effect on one neuron to another
Extracellular Unit Recording
Provides a record of firing of a neuron but no info about the neuron?s membrane potential.
Decreases effects of one neuron to another
Graph of the total number of recorded action potentials per unit of time
Synapses at which the site of neurotransmitter release the site of neurotransmitter reception are in close proximity
Invasive EEG Recording
EEG signals are recorded through large implanted electrodes rather than through scalp electrodes. Cortical EEG signals are frequently recorded through stainless steel skull screws whereas subcortical EEG signals are typically recorded through stereotaxically implanted wire electrodes.
Non directed Synapses
Synapses at which the site of neurotransmitter release and the site of neurotransmitter reception are not close together