1. Histology of Nervous Tissue
Exercise 17

2. Nervous System
Figure 11.1

4. 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

5. Neurons (Nerve Cells)
Figure 11.4b

7. Myelin Sheath and Neurilemma: Formation
PLAY
InterActive Physiology ®:
Nervous System I, Anatomy Review, page 10
Figure 11.5a–c

8. Regions of the Brain and Spinal Cord
White matter – dense collections of myelinated fibers
Gray matter – mostly soma and unmyelinated fibers

9. Comparison of Structural Classes of Neurons
Table

10. 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