Nervous System
Group Members: Claudia Caballero Elio de GraciaErick BetetaExavier CastrellónEmma RamosJuan Poveda
Objectives:Students will
be able to:
Identify dendrites,
cell body, axon of a neuron
Differentiate the structure and function of a motor
and sensory neuron
Compare the location and
functions of central and peripheral
nervous systems
Differentiate the functions of
the sympathetic and
parasympathetic divisions of ANS
INTRODUCTIONNervous system is the chief controlling
and coordinating system of the body.It controls and regulates all voluntary
and involuntary activities of human body.
There are three characteristic properties of nervous system of human body: Sensitivity, Conductivity and Responsiveness
CONTENT
Nervous System
Interesting Facts Main parts Unit of Nervous
System Division
Central Nervous System
Peripheral Nervous System
Function
Encephalon
Spinal Cord
Autonomic Nervous System
Sense Organs
Sympathetic Nervous System
Parasymphatetic Nervous System
Cranial and Spinal Nerves
Somatic Nervous System
Functions of the Nervous SystemControl
Regulate
Communicate
Mental activity center: LearningMemory
Homeostasis
Main Parts of the Nervous System
The nervous system is made of:The encephalon **The nerves
The spinal cord The senses
Central Nervous System
The Central Nervous System controls everything in the body.It contains the nerves of the encephalon and spinal cord
The Cerebrum is the largest part of the encephalon.
It identifies the information gathered by your sense organs.
It is protected by the skull
The cerebrum controls yours:
Thinking
Memory
Speaking
Movements
The cerebellum is below and to the back of the cerebrum.
The cerebellum controls your:
Balance
Posture
The Brain Stem connects:
The brain
The spinal cord.
The nerves in the brainstem control your:
heartbeat
breathing
blood pressure
THE BRAINSTEM
The spinal cord sends messages to the brain.The spinal cord is the part of the nervous system that connects the brain to the rest of the nervous system.
All parts of the nervous system lying outside the brain and spinal
cord.
It carry messages between the
central nervous system and the rest of the body.
It is an automatic System
It controls:
Body’s activities that you don’t think about.
Activities in your small intestine
Breathing
Heartbeat
controls
Cranial nervesHumans have 12 pairs of cranial
nerves (sensory/motor/mixed) which control the head, face, neck,
shoulders
Except VAGUS nerve – controls internal
organs
Somatic Nervous System
Somatic nerves control skeletal muscles, bones, and skin.
Sensory neurons
Mixed Neuron Motor neur
ons
Sensory neurons
Carry impulses from pain receptors in the skin to the
central nervous system (brain and spinal cord)
Motor neuronCarry impulses from CNS to effectors muscles to
make movement through the secretion of a hormone.
Spinal Nerves
Human have 31 pairs of spinal nerves (mixed)
which take impulses to and from the spinal cord
The eye is one of your sense
organs.
The eye is made of the iris and the
pupil.
The eye gathers pictures
and sends them to the
brain.
The eye
Hearing starts when some of the sound waves go into the
ear.
When a sound is made, the air
around the sound vibrates.
The nerves in the skin allow
us to feel texture,
pressure, heat, cold, and pain.
Texture is how
something feels.
The sense of touch is located in the skin.
Skin and Touch
The nose controls your sense of smell.The nose is able to smell 80 different kinds of smells
The nose and Smell
Mouth and TASTEYour sense of taste comes from the taste buds
in the tongue.
Taste buds are the parts on the tongue that allow us to taste.
The four kinds of taste buds are sweet, sour, bitter, and salty.
Autonomic Nervous SystemAutonomic nerves control the muscles of
the glands and internal organs which we can’t control
Sympathetic components
Work in conjunction/opposition to each other
Parasympathetic components
INTERESTING FACTS
About how many neurons are in the human brain?
100 billion
About how many neurons are in the spinal cord?
1 billion
How long do you think the longest axon in the world is?
Around 15 feet