The Nervous System CNS Central Nervous System Central

The Nervous System

CNS Central Nervous System

Central Nervous System • Brain • Spinal Cord

PNS Peripheral Nervous System

Peripheral Nervous System Nerves

Parts of the brain Cerebrum Cerebellum Brain Stem Thalamus Hypothalamus

Cerebrum • • Learning Memory Thinking Seeing Hearing Smelling Tasting Cerebrum

Cerebellum • Balance Cerebellum

Brain Stem • Connects brain with the spinal cord • Controls –Breathing –Heartbeat –Digestion Brain Stem

Thalamus • Sends messages to the correct part of the brain and body • Controls the traffic

Hypothalamus • Controls body temperature

Neurons • Combine to form nerves • Carry messages to and from the brain

Parts of a Neuron Dendrite Cell Body Nucleus Axon Synapses

Dendrite Bushy part of the neuron that receives the messages

Cell Body main part of the neuron that is surrounded by the dendrite

Nucleus • Contains the DNA of the cell

Axon long narrow part of the neuron which carries the message

Synapses Gap between neurons

Types of Nerves Motor Cause your muscles to move

Types of Nerves Sensory Brings messages from your eyes, ears nose, mouth and skin to your brain

Types of Messages Electric carried through the axon of the neuron

Types of Messages Chemicalmessages that travel between the gap (synapse) of each neuron Chemical produced by the axon carries the message

Reflex • an action you do without thinking. • They help protect your body • Like pulling your hand from a hot object, blinking or sneezing