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DSP Note-taker Needed
$25 per unit (of the class)(this will be prorated based on the number
of weeks for which they are hired)
Questions: Please contact WandaThomas:
Phone: 893-2668
Email: [email protected]
Please apply onlineat http://dsp.sa.ucsb.edu/services
mailto:[email protected]://dsp.sa.ucsb.edu/serviceshttp://dsp.sa.ucsb.edu/servicesmailto:[email protected]:[email protected]:[email protected]8/11/2019 L2 Structure and Function of the Nervous System
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Neuronal Signaling: An Overview
3. Receptors in the dendrite of the postsynaptic
neuron receivethe neurotransmitters,
depolarizing the membrane (cell wall).
4. If the depolarization is strong
enough, then it spreads down the
dendrite and across the cell body
integratingwith signals fromother dendrites at the axon
hillock.
2. The presynaptic neuron
communicates to the
postsyaptic neuron by releasing
neurotransmitters across thesynapse.
5. If the depolarization reaches
a critical threshold at the axon
hillock, then an action potential
is conducteddown the axon.
1. A presynaptic and postsynaptic neuron at rest.
6. Once the action potential reaches the axon
terminal, it releases neurotransmitters into the
synapse transmittinga signal to other neurons.
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Four factors establish the resting membrane potential.
1) Concentration gradients
2) Electrostatic pressure
The Resting Membrane Potential of a Neuron
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3) Permeability of the membrane to ions
Four factors establish the resting membrane potential.
The Resting Membrane Potential of a Neuron
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4)Active ion transport (Na+/K+pump)
The Resting Membrane Potential of a Neuron
Four factors establish the resting membrane potential.
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At rest:
. . . Na+want to enter the neuron.
. . . K
+
want to leave the neuron.
. . . Cl-want to remain in equilibrium.
The Resting Membrane Potential of a Neuron
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Inhibitory postsynaptic potentials or IPSPs:
Excitatory postsynaptic potentials or EPSPs:
Polarizing the membrane of a neuron
The Flow of Electrically Charged Ions
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The Starting Site of an Action Potential
Axon Hillock(Initial Segment)
The Ionic Basis of the Action Potential
The Flow of Electrically Charged Ions
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Action potential: a massivemomentary (~1 msec) reversal of the
membrane potential (from -70 mV to+50 mV)
The Ionic Basis of the Action Potential
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Cells Other Than Neurons (Glial Cells)
Astrocytes:
Microglial cells:
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Oligodendrocytes
Schwann cells
Myelin
Cells Other Than Neurons (Glial Cells)
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Dorsal
(superior)
Ventral
(inferior)
Rostral(anterior)
Caudal
(posterior)
lateralsurface
medial
surfacesulcus
gyrus
Some Neuroanatomy
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Hindbrain
Midbrain
Forebrain
Some Neuroanatomy
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Hindbrain
Cerebellum
Brain Stem
Some Neuroanatomy
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Midbrain
Reticular Formation
Substantia nigra &ventral tegmental
Some Neuroanatomy
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Forebrain
Cerebral CortexCorpus Callosum
Thalamus
Hypothalamus
Some Neuroanatomy
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Central sulcus
Precentral gyrus
Postcentral gyrus
motor cortex
somatosensory cortex
Some Neuroanatomy
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Central sulcus
Postcentral gyrus
Precentral gyrusmotor cortex
somatosensory cortex
Some Neuroanatomy
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Frontal Lobe
Temporal Lobe
Parietal Lobe
Occipital Lobe
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