Nervous system

Nervous system
Terminology

Aims of this lesson
1. Name and describe the divisions of the nervous system.
2. Name, locate, and describe the structures of the brain, spinal
cord .
3. Describe the peripheral nervous system.
4. Pronounce, spell, define, and write the medical terms related
to the nervous system.
5. Name common diseases related to the nervous system.
6. Listen, read, and study so you can speak and write.
7. Name, locate, and describe the structures of the eye and ear.
8. Name common diseases related to the eye and ear.

Divisions of the Nervous System
1-the central nervous system (CNS).
consists of the brain and the spinal cord
Divisions of the Nervous System
2- the peripheral nervous system (PNS).
consists mostly of nerves.

There are 12 pairs of cranial nerves(from the
brain).
There are also 31 pairs of spinal nerves. (They
extend from the spinal cord).

Nerve cells :
neurons
neuroglia
• Neurons carry electrical impulses (messages) to
and from the brain and spinal cord.
• myelinated (MY-eh-lih-nayt-ed) also called
white matter.
unmyelinated (UN-my-eh-lih-nayt-ed), They
are also called gray matter.

Synapses
•Neuroglia (noo-ROG-glee-ah) are nerve cells
found between the neurons, connecting
them and providing support and protection.
Neuroglia do not carry electrical impulses.
• examples of neuroglia
1. Astrocytes
2. microglia

Neurons and neuroglia are nerve cells.
Some neurons are myelinated; some neurons

In Brief
are unmyelinated.
Neurons transport electrical impulses.
Neuroglia support and protect neurons.