Section 29-4 “Nervous System ”

Section 29-4“Nervous System” Write everything that isunderlined

KEY CONCEPT The central nervous system interprets information, and the peripheral nervous system gathers and transmits information.

Nervous? • Nervous doesn’t mean afraid or uncomfortable • It is just talking about the nerves which are strands of neurons or nerve cells • Think of it as Nerve-ous

How about interpret? • Definition of Interpret: to explain the meaning of • The Central Nervous System processes and makes sense of the information it’s given from your body • When someone pours water over your head how do you automatically know it’s water? • Your nervous system takes the info and “tells” your brain what’s going on

Peripheral – hard to say isn’t it? • Peripheral means “outer edge” • Peripheral vision means seeing stuff behind you

I. The nervous system’s two parts work together • The Central Nervous System (CNS) includes the brain, brain stem, and spinal cord. • The Peripheral Nervous System (PNS) includes four systems of nerves.

CNS (Central Nervous System) • PNS (Peripheral Nervous System)

The CNS and PNS pass signals between each other • Sensory receptor generates impulse • PNS passes impulse to CNS • CNS interprets impulse • CNS passes impulse to PNS • PNS stimulates a response

midbrain Brainstem pons medulla oblongata The CNS processes information • The brain has three parts: • cerebrum controls thought, movement, emotion • cerebellum allows for balance • brain stem controls basic life functions

midbrain pons medulla oblongata • The brain stem has three parts: • midbrain controls some reflexes • pons regulates breathing • medulla oblongata controls heart function, swallowing, coughing

interneuron motor neurons sensory neuron • sensory neuron sends impulse to spinal cord • spinal cord directs impulse to motor neuron • does not involve the brain • The spinal cord controls reflexes

II. The PNS links the CNS to muscles and other organs • The somatic nervous system regulates voluntary movements • The autonomic nervous system controls involuntary, functions • sympathetic nervous system: “fight or flight” • parasympathetic nervous system: calms the body, conserves energy

Section 29-4 “Nervous System ”