UGA CBIO 2200 - CBIO2200 Exam 5 (34 pages)

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CBIO2200 Exam 5



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CBIO2200 Exam 5

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Pages:
34
School:
University of Georgia
Course:
Cbio 2200 - Anat & Physiol I

Unformatted text preview:

11 06 2014 Chapter 12 Nervous Tissue Overview of the Nervous System Endocrine and Nervous systems maintain internal coordination o Endocrine System Communicates by means of chemical messengers hormones secreted into the blood o Nervous System Employs electrical and chemical means to send messages from cell to cell Nervous System carries out its tasks in 3 basic steps o 1 Receives sensory information about changes in the body and the external environment via sensory receptors and sends coded messages up spinal cord to the brain Ex The sound of a dog barking o 2 Processes sensory information in the brain and spinal cord relates it to past experiences and determines what response is appropriate to the circumstances Ex Deciding how close the dog barking is and whether it is a threat to you o 3 Receives motor commands from brain and sends it down spinal cord to be sent out throughout the body i e muscles and glands and carry out a response Ex Ignoring the dog barking running away etc reaction Subdivisions of the Nervous System Central Nervous System CNS Brain and spinal cord o Enclosed by cranium and vertebral column Peripheral Nervous System PNS Nerves and ganglia o Nerve A bundle of nerve fibers axons wrapped in fibrous connective tissue o Ganglion A knot like swelling in a nerve where neuron cell bodies are concentrated o Divided into two divisions Sensory division and motor division Sensory Afferent Division Carries sensory signal from various receptors to the CNS and informs the CNS of stimuli within or around the body Visceral Sensory Division Carries signals from the viscera of the thoracic and abdominal cavities Internal organs i e heart lungs stomach and urinary bladder Somatic Sensory Division Carries signals from receptors in the skin muscles bones and joints Everywhere else anything that you can feel without involvement of internal organs o Ex Feeling texture softness roughness pain temperature etc Motor Efferent Division Carries signals from the CNS to gland



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