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Histology of Nervous Tissue

Exercise 17

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Nervous System

Figure 11.1

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings

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

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings

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

Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings

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