histology of nervous tissue - collin collegeiws.collin.edu/ngrose/f2011 biol2404/nervous tissue...
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Histology of Nervous Tissue
Exercise 17
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Nervous System
Figure 11.1
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Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
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Histology of Nerve Tissue
The two principal cell types of
the nervous system are:
Neurons – excitable
(irritable) cells that transmit
electrical signals
Supporting cells (Neuroglia)
– cells that surround and
wrap neurons
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Neurons (Nerve Cells)
Figure 11.4b
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Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
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Myelin Sheath and Neurilemma: Formation
PLAY InterActive Physiology ®:
Nervous System I, Anatomy Review, page 10
Figure 11.5a–c
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Regions of the Brain and Spinal Cord
White matter – dense collections of myelinated
fibers
Gray matter – mostly soma and unmyelinated
fibers
http://education.vetmed.vt.edu/Curriculum/VM8054/Labs/Lab9/Lab9.htm
http://www.brainu.org/bu2000.html
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Comparison of Structural Classes of Neurons
Table 11.1.2
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Classification by Function
Sensory (afferent) – carry impulse from external
and internal environments to CNS
Motor (efferent) – carry impulse from CNS to
effector organ
Interneurons (associative) –neurons between
pathways connecting sensory and motor neurons
Secondary neurons