Presentation is loading. Please wait.

Presentation is loading. Please wait.

Nervous System Notes Part 1

Similar presentations

Presentation on theme: "Nervous System Notes Part 1"— Presentation transcript:

1 Nervous System Notes Part 1

Nerve impulses to and from the brain travel as fast as 170 miles per hour. Ever wonder how you can react so fast to things around you or why that stubbed toe hurts right away? It’s due to the super-speedy movement of nerve impulses from your brain to the rest of your body and vice versa, bringing reactions at the speed of a high powered luxury sports car. 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.

2 parts 1. brain 2. spinal cord

4 Parts of the Brain BRAINSTEM (4 parts) 1. Medulla Oblongata Function: regulation of heart rate, breathing, swallowing, vomit response, coughing, sneezing all involuntary actions

5 2. Pons functions as a bridge between the cerebrum and cerebellum

6 3. Midbrain functions in hearing and visual reflexes 4. Reticular Activating System (RAS) located scattered in the brainstem functions in arousing & maintaining consciousness damage here results in a coma

7 Cerebellum processes inputs of cerebral cortex and sensory receptors results in smooth, coordinated movements of skeletal muscles injury results in loss of muscle tone and coordination

8 Diencephalon (interbrain)
Thalamus functions to sort out all the sensory impulses from the body Hypothalamus EXTREMELY IMPORTANT in maintaining homeostasis

9 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

10 The Cerebrum gray matter on the surface of the cerebrum Cerebral Cortex enables us to perceive, communicate, remember, understand, appreciate and move voluntarily (consciousness)

11 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.

12 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)

13 Cerebral White Matter functions to provide communication between cerebral areas also provides communication between cerebrum and the rest of the brain

14 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

Download ppt "Nervous System Notes Part 1"

Similar presentations

Ads by Google