Neuron. Functions of CNS

1.

NEURON

2.

Lesson objectives
To describe and explain the functions of the
nervous system and its structural
components
To determine structural components of the
nerve cell.

3.

What transfers information inside
the organisms?

4.

Functions of CNS:
Control and Regulation of the all other
organs’ processes.
Respond to internal and external stimuli
Memory, learning, voluntary activities

5.

Neurons
Nervous system
consists of nerve
cells called neurons.
They generate and
conduct nerve
impulses (signals).

6.

There are three types of neurons
according to function:
1.
Sensory neurons or afferent neurons receive
signals from sense organs to the central nervous system.
Interneurons make up the central nervous system {brain,
spinal cord} , they interpret the signals that come from the sense
organs and send impulses to motor neurons.).
2.
Motor neurons or efferent neurons receive
impulses from interneurons and send it to organs.

7.

8.

Neuron structure
Neuron consists of three parts:
Cell body
2. Dendrite
3. Axon
1.

9.

Cell body
Cell body contains most of cell organelles
and nucleus.

10.

Dendrite
Dendrites are numerous short
projections of the neuron.
It receives impulses and transfer it to the
cell body.

11.

Axon
Axons are long projection of a neuron.
Generally there is only one axon in a
neuron.
It conducts nerve impulse from cell body
to another neuron.

12.

Name the neuron parts:
1
2
3
4

13.

Lets do an activity on p91.

14.

Homework
Read p. 90-91
Answer to literacy questions on p 91.
New words