The Nervous System

Nervous System

• What is it?

–The system that receives,

processes, stores and

transmits information that

comes from various parts of the

body and the external world.

Nervous System

It is composed of 2 parts:

The Central Nervous

System (CNS)

The Peripheral Nervous

System (PNS)

Central Nervous

System• The central nervous

system is the part of

the nervous system

that is made up of

the

–the brain

–spinal cord

The BrainThe parts of the central

nervous system located in

the cranium

Parts of the Brain

• 3 main

parts:

• Cerebrum

• Cerebellum

• Brain stem

Cerebrum

• Command centre

for all voluntary

movement,

interpretation of

senses, emotions

and intelligence

Parts of the Brain

Cerebrum

In other words it is

responsible for:

Thinking

Moving

Emotions

Sensing

Parts of the Brain

The cerebrum is

divided into the

right and left

hemisphere

The left hemisphere

controls the right side

of the body and vice

versa

Parts of the Brain

Cerebrum

The cerebrum is made up of two

types of matter:

Parts of the Brain

Grey matter: outer layer

- Also called the cerebral

cortex

- Directs higher brain

functions like planning,

reasoning and logic

Cerebrum

Grey matter makes up about 40% of

the brain and uses up about 94% of

available oxygen

Parts of the Brain

Cerebrum

Parts of the Brain

•White matter:

• inner layer

• Acts as a relay between the different

brain regions

•In other words, it coordinates

communication

Cerebrum

•White matter

makes up about

60% of the brain

Parts of the Brain

Cerebellum

• Part of the brain that

coordinates balance

and posture (by

contracting

appropriate

muscles)

Parts of the Brain

Brain stem (Medulla

oblongata)

• Regulates:

– breathing

– heart rate

– communication to

cerebrum

Parts of the Brain

Parts of the Brain

Functions

Sensory & Motor Parts of

the Cerebrum

Frontal lobe:

reasoning,

planning,

speech,

muscle control,

personality,

emotion

Sensory & Motor Parts of

the Cerebrum

Parietal Lobe:

sensing,

interpreting

language

Sensory & Motor Parts of

the Cerebrum

Occipital Lobe:

vision

Sensory & Motor Parts of

the Cerebrum

Temporal Lobe:

hearing,

understanding

language,

memory storage

More About the Brain

•Brainline– https://www.brainline.org/tbi-

basics/interactive-

brain?gclid=Cj0KEQiArou2BRDcoN_c6NDI3o

MBEiQANeix5iQSvRyqlv5JILl5Tewwqtq_z66e

pIfuzeCVpwKFnRwaAg-M8P8HAQ

More About the Brain

•Brainwaves Centre– http://www.brainwaves.com/#parietallobe

More About the Brain

•Brain Anatomy– https://www.mayfieldclinic.com/PE-

AnatBrain.htm