4125 CNS and Afferent PathwaysWbCT2010

4125 CNS and Afferent PathwaysWbCT2010 - The CNS and...

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Unformatted text preview: The CNS and Afferent Pathways (Chapter 10) 1. Review of expected prior knowledge 5. Contralateral control 2. Protection of CNS 7. Split-brain patients 3. Basic structure and functional components of the brain 4. Language 6. Cerebral lateralization Ill give a short history, and then: The general theme of my lectures will be perception and whether perception is always reality? How do we know what type of information we are processing? We have sensory receptors that detect stimuli and transduce the energy of the stimuli into electrical signals, which are then processed in a particular part of the brain How do linked neurons create:- affective behaviors (feeling and emotion)?- cognitive behavior (related to thinking)? 4 main functions of nervous system : 1. Detect information. 2. Recognize significance. 3. Decide on response. 4. Execute action. 1. Review . How is this achieved? More specifically, information is transmitted by Reflex Pathway (s); 1. Sensory (afferent) neurons carry information from PNS to CNS - Afferent (Sensory) Pathway. 2. Neurons relay the information from CNS to effector organs - Efferent (Motor) Pathway. 2 types of efferent pathways : a. Autonomic Nervous System controls internal organs. b. Somatic Motor Division controls skeletal muscle. i. Sympathetic system: ii. Parasympathetic system: reflex arc Fright/flight system .; rest and digest Peripheral Nervous system : b.31 pairs of spinal nerves (originating in the spine): mixed. a.12 pairs of cranial nerves (originating primarily in the brain stem : mixed/afferent or efferent. (What do we mean by mixed nerves?) What are these pathways made of? Nerves PNS has 43 pairs of nerves: Contain both afferent and efferent neurons. For interest. Know what these nerves do and what type they are Cranial Nerves Whats the other name for the auditory nerve ? Does anyone know the trick to remembering this? vestibulocochlear SPINAL CORD AND NERVES Major information pathway from the skin, muscles and joints to the brain. 4 main regions: See Fig 10.6 Cervical, Thoracic, Lumbar, Sacral Nerve fibers travel to adjacent areas of body. Fig 10.7 myotome: collection of muscle fibers innervated by the motor axons of each nerve (root) dermatome: the area of skin innervated by the sensory axons of the nerve (root) Each segment of spinal cord has a pair of bilateral spinal nerves....
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This note was uploaded on 10/14/2010 for the course ZOO 4125 taught by Professor Flanigan during the Fall '10 term at Wyoming.

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4125 CNS and Afferent PathwaysWbCT2010 - The CNS and...

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