Nervous System Supplies information about internal and external environment.

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Presentation transcript:

Nervous System Supplies information about internal and external environment

Parts: Brain Spinal cord Nerve fiber Sensory receptors

1 st part of the system: Autonomic nervous system: Controls the automatic functions Respiratory system Digestive system Eyes Heart Blood vessels Glands

2 nd part of the system:  Central Nervous System  Controls Movement Communication Has 2 parts: 1.Spinal cord and brain 1.Peripheral nerves

Nerves: Bands of white tissue From central nervous system and ganglia and extend to all parts of the body

2 kinds of nerves: 1.Send impulses to the brain over sensory fibers - 2.Carry commands back from the brain over motor fibers

Sense Organs/Receptors: Nerve endings receiving stimuli from the outside

General sense organs: Respond to pain, touch, temperature

Special Sense Organs: Respond to smell, sight, taste, and hearing

Nerves follow the course of the arteries Exp: telephone wires – contain many separate lines in a bundle

3 main parts of the brain: 1.Brain stem 2.Cerebrum 3.Cerebellum

Brain Stem (primitive brain) Contains nerve centers that control heartbeat, respiration, temperature, etc…

Cerebrum (brain) Performs functions of memory, intelligence, and emotional response

Cerebellum: Controls muscular coordination, balance, equilibrium Smaller than cerebrum

Ganglia: Secondary nerve centers located along spinal cord Receive and dispatch nerve impulses that do not have to reach the brain Exp: heat, pain, excessive pressure, reflexes

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