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January 14th - Spinal Cord.docx

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Wilfrid Laurier University
Bruce Mc Kay

Spinal Cord 1/14/2013 12:31:00 PM General layout of the nervous system  Central Nervous System o Brain o Hole in the skull were the spinal cord extends of the skull  Peripheral Nervous system (PNS)  “We are only aware of the state of our nervous” o Means everything in the world is intvented. We are only aware of the exact things that hit ours sensory receptors and that our brain fills in a huge amount of detail Peripheral nervous system  Everything that comes into your brain is sensed and sent by your PNS  Autonomic Nervous System: Fight or flight, calming down to sleep at night o Sympathetic and Parasympathetic balance each other  The two systems can give you a range of what you can do and the speed and timing of how you do things  What is important about the difference between the two of these is how the fibers extend through the body and to specific regions, the fibers extend from different regions to the brain  Sympathetic originates from the thoracic region and some of the lumbar region, they send out to many regions at once  Deals with fight or flight responses  MDMA activates the sympathetic nervous system  Parasympathetic originated from the brain itself, the cervical, and the sacral region  You can control these areas very specifically  In order to get an erection, you have to be more relaxed  Having an ejaculatory event you have to a higher level of excitement o Summary  Sympathetic  Connections are 1:many  Parasympathetic  Connections are 1:1 o Typical disease affecting the autonomic nervous system  Hirschsprung’s Disease  The colon will expand and expand to an enormous amount and will burst at some point  There are surgical techniques that allow for treatment.  If not recognized in infancy then it fatal  Raynaud’s Disorder  The blood vessels are enormously constricted  Can be particularly painful if the blood flow returns after the period of constriction The Spinal cord: sensory input and reflexes  The role of the spinal cord is to take in information and send it to the brain, sensory input, and taking things from the brain to the areas of the body to cause motor output  All of the sensory information flows into the back, Dorsal  Ventral is at the front  Grey matter  cell bodies; White matter  axons  The spinal cord = a series of wires that are the size of your pinky that sits in the hole of the vertebra  Patellar reflex (stretch reflex) o Typical disorder: Westphal’s sign  Absence (or decrease) in stretch reflex  Activates your quadriceps that allow you to kick forward and inhibits the hamstring muscle so that it does not appose the movement  They complete this to ensure that there is adequate reflexes given by the spinal cord and that everything is functioning as it should since the response has to transverse the majority of the spinal cord.  Any issues in the spinal cord will inhibit the response  There are 31 pairs od spinal nerves o The point is to understand where the areas of the spinal cord and the purpose that they have. o Everything is symmetrical in signal sending o The application of this knowledge is the each of these levels of the spinal cord are responsible for a certain dermatome (a section of your skin)  Any where along a bad of tissue, contact would cause the signal to be sent to the particular level of the spinal cord o Heart Attack  crushing pain in the left chest and left arm  This occurs because the dermatomes that innovate the chest also collects information from the heart and makes contact with the left arm.  There is no pain in the arm per say, but you see this massive signal coming from the heart and the brain is tricked into thinking it is from the arm as well o People use dermatomes to explain the concept of fetishes:  The sacral area regulated not only the genitals and the backs of your legs to your feet  The regions associated with pleasure also get sent down to your feet and leg s  For some people this is like referred pleasure for those sensory inputs Cutaneous Receptors for touch and pain  Free Nerve Endings o Originally call
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