Transcript Class Topics

7/20/2015
Title:
Anat & Phys
11/6/06
Objectives:
To prepare to assess knowledge of the skeletal
system and learn about the nervous system.
Class Topics
• Review for Skeletal System Test
• Nervous System
Do what you can, with what you have, where you are.
Theodore Roosevelt
Monday, July 20, 2015 6:03 PM
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Class Assignments
What
• Skeletal System Test
By When
11/8/06
• Due this class period
• Due next class period
• Due in the future
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Nervous System
• Divisions
– Central Nervous System (CNS)
• Brain & Spinal Cord
• all sensory impulses arrive here
• all motor impulses originate here
– Peripheral Nervous System (PNS)
• all nerves outside of CNS
– cranial nerves - from brain
» 12 pairs
– spinal nerves - from spinal cord
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PNS
• 2 divisions
– somatic (voluntary)
• sensory and motor
– autonomic (involuntary)
• sympathetic
– used during stressful times
» injury, strenous physical activity, etc
• parasympathetic
– used during normal functioning
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Nerve Tissue
• Neurons
– nerve cells
• Neuroglia
– support and maintain neurons
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Neuroglia
(Figure 9-2)
•
•
•
•
Astrocytes - CNS - control blood flow
ependymal cells - CNS - form CSF
Microglia - CNS - used to clean
Oligodendrocytes - CNS - used to
speed up action potentials
• Schwann cells - found in PNS - aids in
conduction of action potential and
helps large neurons
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• Cell body
– cytoplasm, nucleus (with
nucleolus), and organelles
Neuron
Parts
• organelles including Nissl bodies
(like RER) and lacking mitotic
spindles
• Dendrites
– numerous
– conduct action potential towards
cell body
• Axon
– single
– conduct action potential away
from cell body
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