Download Central Nervous System - tvhs2011

 The central nervous system function is mainly to send
and interrupt messages throughout the body.
 It allows us to react to stimuli, sends chemicals that
give us feelings, and enables our body to function.
 The nervous system consists mainly of two parts.
These parts being the brain and the vertebrae also
known as the spinal cord.
 Another major component in the central nervous
system are neurons. Neurons are cells that send and
receive messages throughout the body so that the body
can react to stimuli in and outside of the body.
BRAIN: Function and parts
•The brain has two hemispheres; the
right hemisphere and the left
hemisphere. It consist of three major
parts:
- Brain Stem: the brain stem
controls the involuntary movements
of the body.
- Cerebellum: the cerebellum
controls the coordination of the body.
- Cerebral: the cerebral controls
thought, intelligence and reasoning
skills. It is also categorized into 4
lobes;
• Frontal- controls speech and
thought.
• Parietal- controls temp., pressure,
and stimuli.
• Opsipital- controls vision and
sight.
• Temporal- controls hearing and
memory.
Neurons: Functions and parts
•Neurons send and receive messages
throughout the body and are found
through out the central nervous
system. The parts are:
- Dendrites: receive messages from
other cells
- Soma: acts as a body for the
neuron.
- Nucleus: the nucleus controls the
cell and its functions
- Axon: the axon is the tail of the
neuron and consists of two parts:
•Myelin Sheath- made up of
Schwann cells , the myelin sheath
allows messages to move through
the axon faster.
•Axon Terminal- the axon terminal
receives a message that it then
sends to other cells.
A Comparison of the Rat and Human Brain
 http://www.cerebromente.org.br/n07/fundamentos/n
euron/parts_i.htm
 http://seys-science.wikispaces.com/nerve+cell+g