PS263 Chapter Notes - Chapter 4: Autonomic Nervous System, Dura Mater, Vagus Nerve
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3. 1 general layout of the nervous system. Located outside the skull and spine: two divisions, somatic nervous system part 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. ). Sympathetic nerves autonomic motor nerves that project from the. Cns in the lumbar and thoracic regions of the spinal cord. Parasympathetic conserve 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 arousal. There are 12 pairs of cranial nerves: sensory, motor and both, autonomic motor fibers are parasympathetic. Longest is the vagus nerve (to and from the gut) Brain and spinal cord are protected by three layers of meninges: dura mater (tough mother, arachnoid mater (spider-weblike membrane, pia mater (pious mother) This can only be treated draining the excess fluid from ventricles.
