Presentation on theme: "Nervous System Notes Part 1. Nerve impulses to and from the brain travel as fast as 170 miles per hour. INTERESTING NERVOUS SYSTEM FACTS The brain operates."— Presentation transcript:
Nerve impulses to and from the brain travel as fast as 170 miles per hour. INTERESTING NERVOUS SYSTEM FACTS The brain operates on the same amount of power as 10- watt light bulb Your brain generates as much energy as a small light bulb even when you’re sleeping.
The Cerebrum Cerebral Cortex gray matter on the surface of the cerebrum enables us to perceive, communicate, remember, understand, appreciate and move voluntarily (consciousness)
3 functional areas of the Cerebral Cortex 1. Motor Areas controls movements of skeletal muscles, speech and eyes 2. Sensory Areas conscious awareness of sensations (hot, cold, pressure, pain) 3. Association Areas connect different parts of the cortex involved in recognizing smells, tastes, etc.
Examples of Association Areas sensory association areas visual association areas auditory association areas general interpretation area: integrates all incoming signals into a single thought prefrontal cortex: most complicated part of brain – intellect and complex learning (abstract ideas, judgment, reasoning)
What the hypothalamus controls Autonomic Control Center blood pressure, heart rate, digestive tract, eye pupil (involuntary responses) Emotional Responses pain perception, pleasure, fear, etc. (limbic system) body temperature, hunger, thirst, sleep endocrine system hormones Hypothalamus Disturbances body wasting, or obesity, sleep problems, dehydration, emotional imbalances, and more
4. Reticular Activating System (RAS) located scattered in the brainstem functions in arousing & maintaining consciousness damage here results in a coma 3. Midbrain functions in hearing and visual reflexes
Brain Disorders (some examples) Parkinson’s Disease deficiency of the neurotransmitter dopamine Epilepsy sudden burst of irregular electrical activity in brain – can lead to seizures, convulsions Stroke blood clot in brain – paralysis appears on side of body opposite to side of brain affected Alzheimer’s Disease part of cortex shrinks, neurons lost results in dementia, memory loss, disorientation, loss of body function