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Chapter 4

BioPsych Chapter 4

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BioPsych Chapter 3 Anatomy of the Nervous System31General Layout of the Nervous System Divisions of the Nervous System Central Nervous system Located within the skull and spinePeripheral Nervous System Located outside the skull and spine Two divisions oSomatic nervous systempart of the PNS that interacts with the external environment it is composed of afferent nerves carry sensory signals from the skin skeletal muscles joints etc Efferent nerves carry motor signals from the CNS to the skeletal muscles oAutonomic nervous systempart of the PNS that regulates the bodys internal environment Afferent nerves from internal organsCNS Efferent nerves carry motor signalsinternal organs Autonomic Nervous system oTwo kinds of efferent nervesSympathetic nervesautonomic motor nerves that project from the CNS in the lumbar and thoracic regions of the spinal cord Parasympathetic nervesautonomic motor nerves that project from the brain and sacral region of the spinal cord Sympathetic and parasympathetic neurons project from the CNS and go part of the way to the target organs before they synapse on other neurons sympathetic neurons synapse on neurons that are a substantial distance from their target organs parasympathetic neurons synapse near their target organs Sympatheticstimulate organize and mobilize energy Parasympatheticconserve energy Each autonomic target organ receives opposing sympathetic and parasympathetic input and the activity is controlled by relative levels of activity Sympathetic changes are indicative of psychological arousalParasympathetic changes are indicative of psychological relaxation There are 12 pairs of cranial nerves Sensory motor and both Longest is the vagus nerve to and from the gut Autonomic motor fibers are parasympathetic Meninges Ventricles and Cerebrospinal Fluid Brain and spinal cord are protected by three layers of meninges Dura mater tough mother
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