The Nervous System Chapter 11.

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Presentation transcript:

The Nervous System Chapter 11

Two types of cells neurons neuroglia (glial cells):

Neuron anatomy cell body

Neuron anatomy dendrites

Neuron anatomy axon

Neuroglia of the PNS Schwann cells

Neuroglia of CNS oligodendrocytes

Action Potentials (nerve impulses)

Action potentials depend on resting membrane potential

Action potentials

How does this happen? (Big picture)

Conduction of AP continuous saltatory

At axon terminal bud, stimulus is transferred to another cell

Synapses: elaborate cell junctions made up of:

Events at a synapse

Pathology: Multiple sclerosis (MS)

2 divisions of nervous system 1. central nervous system (CNS) 2. peripheral nervous system (PNS)

Divisions of PNS sensory: motor: somatic: autonomic: sympathetic: parasympathetic:

Nervous system another way CNS PNS sensory motor somatic autonomic sympathetic parasympathetic

CNS: our brain three anatomical & functional divisions Forebrain

Hindbrain (3 parts) medulla oblongata pons cerebellum

Midbrain (1 part) midbrain

Forebrain (3 parts) cerebrum corpus callosum thalamus corpus callosum

Lobes of the brain frontal parietal occipital temporal

CNS: spinal cord

Protection of CNS axial skeleton meninges: membranous coverings

Protection of CNS Cerebral spinal fluid (CSF) Location of CSF

CSF pathology hydrocephalus

Remember the divisions of PNS? somatic:

Remember the divisions of PNS? autonomic:

Autonomic nervous system most organs have dual innervation

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