Nervous System. Central Nervous System  Brain = mass of nerve tissue  Weigh about 3 lbs.  Reaches full about 6yrs. Old  3 – 5 min. supply of.

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Presentation transcript:

Nervous System

Central Nervous System  Brain = mass of nerve tissue  Weigh about 3 lbs.  Reaches full about 6yrs. Old  3 – 5 min. supply of oxygen for nerve cells  Blood brain barrier = blood flowing is filtered; harmful chemicals cannot enter the brain

Spinal Cord  Connected from medulla oblongata to lower back (lumbar)  Vertebrae surround & protect spinal cord  Responsible for carrying info to the brain & to body cells

Sections of the Brain  Cerebrum  Largest section  Separated into lobes  Responsible for reasoning, thoughts, emotions, memory, speech, senses, movement

 Cerebellum  Located below the back of the cerebrum  Responsible for muscle coordination, balance, posture, muscle tone

Lobes of the Brain  Occipital  Back portion  Responsible for vision, reading ability  Temporal  Lower side of the brain  Responsible for hearing

Lobes of the Brain  Frontal lobe  Top, front region  Responsible for emotions, reasoning, memory, judgment, speech  Parietal  Middle portion  Responsible for sensory & motor skills

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