NERVOUS SYSTEM AND ITS MAJOR PARTSBy: Jenil Urianza-Moises

OBJECTIVE

Identify the nervous system and its major parts

The NERVOUS SYSTEM is the part of the body that coordinates its voluntary and involuntary actions and transmits signals to and from the different parts of the body.

PARTS OF THE NERVOUS SYSTEM

1. BRAIN is made up of billions of nerve cells

CEREBRUM is the principal and most anterior part of the brain in vertebrates, located in the front area of the skull and consisting of two hemispheres, left ad right, separated by a fissure.

It is responsible for the integration of complex sensory and neutral functions and the initiation and coordination of voluntary activity in the body.

CEREBELLUM or little brain is involved in some cognitive functions such as attention and language and in regulating fear and pleasure responses.

MEDULLA OBLONGATA is a cone-shaped neuronal mass responsible for multiple autonomic (involuntary) functions ranging from vomiting to sneezing.

2. SPINAL CORD is a long slender nerve that is connected to the medulla and goes down to the spinal column or backbone.

It carries out two main functions:

1. it connects a large part of the peripheral nervous system to the brain.

2. Information (nerve impulses) reaching neurons are transmitted up into the brain.

3. NERVE CELL OR NEURON is the basic unit of structure in the nervous system. It forms a network to receive and send messages.

EVALUATIONMatch column A with column B.Column A

Column B1.Spinal Cord a. It is the control center

of the body2.Nerves b. carry nerve

impulses from one part of the body to another

3.Backbone c. protects the spinal cord

4.Brain d. it is the channel through which

messages travel from the nerves in

the different parts of the body to the brain at

the back5.Cerebrum e. largest part of the

brain f. controls

the movement of muscles

ASSIGNMENT

Make a crossword puzzle about the parts of the nervous system.

References: RBEC-PELC 4.1 p.4Science for Better Health and environment, pp. 40-41 by Efrain E. Abracia21st Century Science and Health, pp. 23-24 by Gloria Salandanan