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71 Cards in this Set

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  • Back
Nerve cells contain a nucleus and a ______ or _____
Cell body or soma
Nerve cells contain a _________ and a cell body or soma.
Nucleus
The cell body receives impulses from its
______________.
Dendrite
Dendrites are also called what?
Afferent fibers
The cell body sends impulses out via it's
axon
Axon is also called
efferent fiber
Nerve impulses must cross from axon to dendrite by way of a
synapse
The chemical that transmits impulses from one nerve to another is
acetylcholine
A fatty sheath called ______ covers many neurons
myelin
The interior of a neuron has a ________ charge relative to the outside
negative
The extracellular fluid is rich in _______ ________ with a __________ charge
sodium ions with a positive charge.
A measure of how much voltage is required to drive the EEG pen a certain distance. Expressed as a comparison of voltage input in microvolts to pen deflection in millimeters.
Sensitivity
Calculation for Sensitivity
Voltage / amplitude

S= V / A
Calculation for Voltage uV
Amplitude X Sensitivity

V = A x S
Calculation for Amplitude (mm)
Voltage / Sensitivity

A = V / S
Carry a positive charge and reside in the nucleus of an atom
Proton
Carry a negative charge and surround the nucleus in orbits
Electrons
States than while unlike charges attract, like charges repel.
Coulombs law
The movement of electrons in a conductor
electric current
Electrical measurement for current
Ampere
Abbreviation for ampere
I
Force that makes electrons flow
Electromotive Force.
Electromotive force is usually referred to as
voltage.
Unit of measure of resistance
ohm
Relationship between electricity, current, voltage and resistance is called
ohm's law.
Calc. for voltage
Voltage = Current X Resistance

E = I X R
Calc. for current
Current = Voltage / Resistance

I = E / R
Calculation for Resistance
Resistance = Voltage / current

R = E / I
E
Voltage
I
Current
R
Resistance
Resistance is measured in
Ohms
Voltage is measured in
Volts
Current is measured in
Amperes or amps
Capacitance is measured in
Farads
impedence is measured in
Ohms
Resistance and Impedance are both measured in
Ohms
2 main functions of eeg amplifiers
1. Discrimination of a signal between two imputs.

2. To increase the size of these potential differences to the level where they can drive the pens of a write out unit.
Name two types of amplifiers
Single ended and differential
In phase signals are also called what?
Common mode signals
Similar to resistors in that they are also materials that do not easily give up electrons
Insulators.
The primary affect of the low frequency filter is the attenuation of frequencies...
below 5 Hz
Low frequency filter is also called
high pass filter
The amount of time it takes the pen to fall to 37% of its initial input
decay time constant
The frequency above which there is minimal or no attenuation of an amplitude and below which there is significant attenuation of amplitude
cut off frequency
Time required for a capacitor to charge to 63% of its full charge
Rise Time constant
The high frequency filter is also called the
high pass filter
elements frequencies between 58-62 hz
60 hz filter
In the united states we use a standard paper speed of
30 mm/sec or 3 cm/sec
Slower paperspeeds have the affect of
pushing waves together
faster paperspeeds have the affect of
spreading out the waveforms
a measure of how much voltage is required to drive a pen a specific distance.
Amplification
Amplification is measured in
microvolts per millimeter or uv/mm
Calculation for Sensitivity
Voltage / Amplitude
V / A
Voltage =
Amplitude X sensitivity
A X S
Amplitude=
Voltage / Sensitivity

V / S
number of waves per second
Frequency
Frequency is expressed as
Hz or CPS
test to see if pens jump when machine is turned on or off
electrical baseline
The amount of spacing between the baselines of each channel
mechanical baseline
proper alignment of the pens
time axis
2 components of the nervous system
central and peripheral
The central nervous system consists of...
brain and spinal cord
4 parts brain can be divided into
cerebrum, diencephalon, brainstem, cerebellum
involved in higher brain functions, thinking sensation and movement
cerebrum
4 lobes of the cerebrum
frontal, parietal, temporal, occipital.
The diencephalon contains the
thalamus and hypothalamus
responsible for pacing rhythmic eeg activity such as alpha and sleep spindles.
thalamus
Plays a role in pain sensation and maintenance of alertness
thalamus
regulates basic biological needs such as hunger and thirst
hypothalamus
The brainstem contains the
midbrain, pons, medulla.