Lab 6 - Brain Spinal Cord & Nerves

Lab 6 - Brain Spinal Cord & Nerves - The Brain, Spinal...

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Unformatted text preview: The Brain, Spinal Cord, and Nerves Neuron • Neuron: an electrically excitable cell that transmits information • Dendrite receives electrical impulse • Axon sends electrical impulse to axon terminal (size 10-25 micrometers) • Axon terminal receives impulse and releases Neurotransmitters and other dendrites The Cerebrum • Two hemispheres - superior part of the brain • Majority of total brain mass (83%) • The surface is covered with GYRI (elevated ridges) and SULCI (depressions) • Corpus Callosum – allows the 2 hemispheres to communicate with each other • Deep fissures separate the hemispheres into lobes – Longitudinal fissure separates the 2 hemispheres – Transverse fissure separates the cerebrum from the cerebellum The Cerebrum Corpus Collosum Longitudinal Fissure Frontal Lobe • Controls motor function • Speech Production • Aspects of Personality are based on this lobe. Parietal Lobe • This is where the Conscious perception of the following are interpreted: – Touch – Temperature – Pain – Pressure – Vibration Temporal Lobe • Recognition of sounds, their tones, and loudness takes place • Awareness of Different Odors • Also stores memories Occipital Lobe • Vision – Analyzes and interprets visual information from sensory nerve signals sent by the eyes The Diencephalon • Forms the central core of the forebrain and is surrounded by the Cerebral Hemispheres • Consists of 3 structures: – Thalamus – Hypothalamus – Epithalamus Thalamus • Makes up most of the Diencephalon – Impulses from the body converge at the Thalamus, and synapse with one of its nuclei and are sorted before ascending to the cerebral cortex (receives information and sends it to the hypothalamus). Hypothalamus • These functions include – Regulation of food, thirst, sleep-wake cycles – Autonomic Control: • Influences blood pressure, heart rate, respiratory rate – Emotional Control: • Perception of pleasure, fear, rage, sex drive – Body Temperature • The Hypothalamus is the thermostat for the body and controls sweating and shivering – Long-term memory Epithalamus • The most dorsal portion of the diencephalon • Connects the limbic system to other parts of the brain • Pineal body - secretes melatonin involved sleep/wake cycles (extends from posterior border of epithalamus) The Brain Stem • Contains centers that regulate several functions...
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This note was uploaded on 04/14/2008 for the course PET 3322L taught by Professor Rich during the Spring '08 term at FSU.

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Lab 6 - Brain Spinal Cord & Nerves - The Brain, Spinal...

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