* A stimulus triggers a nerve in the Peripheral Nervous System (PNS) which sends a Neural Impulse (Action Potential) through the PNS towards the Central Nervous System (CNS) * Once the NI enters the Spinal Cord it ascends towards the brain where it enters the Brain Stem * The Thalamus, acting like a conductor, sends the NI to the area of the brain for processing

* A nerve cell

* A bushy branching extension * Receives messages from other neurons and conducts impulses toward the cell body

* Extension of a neuron, ending in branching Terminal Fibers * NI’s passed to other neurons

* Layer of fatty tissue encasing the Axon * Helps speed the transmission of the NI Degeneration of the MS Delays the transmission of NI’s

* Neural Impulse * A brief electrical charge that travels down an Axon

* Gap between Axon Terminal of one neuron and the Dendrites of another neuron =TW6v96zzOZM

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

* Sensory and Motor Neurons that connect the CNS to the rest of the body * Two sub-systems * Somatic Nervous System (SNS) and Autonomic Nervous System (ANS)

* Voluntary control of skeletal muscles *

* Glands and muscles of internal organs; glandular activity, heartbeat, digestion * I want you to think about your heart right now, is it beating? * 367/6= * 61.7 * Two sub-systems * Sympathetic NS and Parasympathetic NS

* Arouses and expends energy * Accelerated heart rate, blood pressure increases, releases adrenaline

* Conserves energy and calms HR and lowers blood pressure

* Brain * Spinal cord

* 40 billion neurons that connect to 10,000 neurons individually= 100 trillion synapses * If you were to spend $20 a second it would take you 23,120 days to spend $40 billion * Spinal cord: ascending neural fibers send sensory info, descending NF’s send back motor control info

* Automatic responses to a stimuli * Test our reflexes * Partner up * Stopwatch * Ruler * Record

* Amplified recording of the waves of electrical activity that sweeps across the brain

* Visual display of where the brain is consuming fuel (glucose) during a given activity

* Magnetic fields and radio waves used to produce images of soft tissue Think of as a picture

* Mapping blood flow in the brain, when multiple images are viewed in succession it shows brain function * Think of as a movie

You want to learn about seizures, a disorder caused by a sudden, extreme rise in neural impulses= (EEG) You want to see how much energy is consumed by the brain when someone is reading versus reciting a memorized passage= (PET) You want to see where Alzheimer’s affects the speech area of the brain= (MRI) You want to see what areas of the brain are used when completing a word search= (fMRI)

emore_the_mysterious_workings_of_the_adol escent_brain?language=en#t What is the main difference between MRI and fMRI? 2.What is Synaptic Pruning? 3.What is significant about the increased use of medial prefrontal cortex in adolescents? 4.Why do adolescents take so much pleasure in hyper-risk taking?

Our Brain About 2% of our body mass, at 3 pounds Consumes almost 20% of our body’s energy The social-brain

Oldest part of the brain All mammals have in common

* Base of the brainstem and controls: heartbeat and breathing

* Above the Medulla and coordinates movement

* Top of the Brainstem and acts as the brains “sensory switchboard” * Info from seeing, hearing, tasting and touch (not smell) * Sends info to the correct brain structure

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* “little brain” * Controls time judgment, modulates emotions and discriminates sounds and textures, coordinates voluntary movement

* Boarder between “old brain” and the Cerebral Hemispheres

* Aggression and fear

* Directs eating; drinking; body temperature; linked to emotions and reward Some scientists believe this is the root of addictive behaviors

* Center of emotion; memory and the autonomic nervous system

* The body’s ultimate control and information- processing center * More advanced species have an expanded CC with relaxed genetic controls and increased adaptability * Glial cells- support, nourish and protect neurons (about 9 times more than neurons)

* Frontal * Parietal * Occipital * Temporal

* Judgment * Planning and processing of new memories * Personality * Moral judgment

* Mathematical and spatial reasoning * Processes taste, touch and temperature

* Visual cortex * R eye=L side * L eye=R side

* Understand and interpret speech * Auditory cortex * R eye=L side * L eye=R side

We are going to fill out our diagram

* Controls voluntary movement * R=L * L=R Rear of Frontal Lobe

* Registers and processes body touch and movement sensations Front of Parietal Lobe

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