Physiology 1021 Lecture Notes - Lecture 2: David H. Hubel, Musical Tone, Red Distribution

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Two divisions of the nervous system: central nervous system (cns) Brain mostly made up of interconnected neurons. Spinal cord: peripheral nervous system (pns) Visceral system (autonomic nervous system) parasympathetic or sympathetic (eg. fight or flight) Views of the brain: dorsal down on top/from above, ventral from below, lateral from the side, medial (midline) cutting the brain in half. Ipsilateral same side: contralateral opposite side. Planes through the brain: midsagittal, horizontal, coronal (guillotine) Cerebrum (cerebral cortex) two cerebral hemispheres divided by the sagittal fissure (midline); concerned with contralateral sensation and movement. Cerebellum has two hemispheres; concerned with ipsilateral motor control. Brain stem the most primitive part of the brain; concerned with life functions respiration, body temperature. Spinal cord conduit for information to and from the brain; sensory and motor losses following. Midbrain tectum (superior and inferior colliculus); tegmentum. Has 31 segments each has a pair of spinal nerves (one left, one right)

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