Nissil Bodies Axon Hillock Motor Neuron Schwann Cell.

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Presentation transcript:

Nissil Bodies

Axon Hillock

Motor Neuron

Schwann Cell

Functional Classification 1. Sensory (afferent) 2. Motor (efferent) 3. Interneurons Conducts action potentials from periphery to CNS Transmits action potentials from CNS to periphery Impulses to effectors Completely within CNS Transmits action potentials from one part of CNS to another part of CNS

Neuroglia

Neuroglia CNS Oligodendrocyte- Forms Myelin Astrocyte- Promote blood brain barrier, nourish neuron, strengthen. "mommy" Ependymal- Produce cerebrospinal fluid, form blood brain barrier Microglia- Phagocytize bacteria

Neuroglia PNS Schwann Cell- Myelin Satellite Cell- nourish and support (The mommy for the PNS)

Disorders of the Neuroglia Amyotrophic Lateral Sclerosis/ Lou Gehrig's- Astrocyte's secrete toxins that destroy neurons Hungtington's- Microglia secretes toxins destroying neurons

Membrane Potential

Measuring the Action Potential

hill.com/sites/ /student_view0/cha pter10/voltage- gated_channels_and_the_action_potential.ht ml

Neurotransmitters +30 or more types Acetylcholine – stimulates skeletal muscle contractions Monoamines Norepinephrine Dopamine Norepinephrine & Dopamine generate a sense of well-being in CNS Amphetamines increases levels of dopamine & Norepinephrine Amino Acids GABA General Inhibitory neurotransmitter in CNS Opens Cl- channels, Cl- influx hyperpolarizes cell Some Anesthesia enhance GABA secretions Schizophrenia – associated with GABA deficiency Gas Nitric Oxide (NO) Vasodilator Released during sexual arousal Viagra prolongs the presence of NO

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