BLG 600 Lecture Notes - Lecture 1: Central Nervous System, Peripheral Nervous System, Somatic Nervous System

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12 Sep 2016
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Lecture 1 overview of the nervous system. Brain and spinal cord process sensory input and initiate responses. Brain, spinal cord, nerves, sensory receptors: subdivisions. Central nervous system (cns): brain and spinal cord. Peripheral nervous system (pns): sensory receptors and nerves of the nervous system. Cranial nerves: originate from the brain; 12 pairs. Spinal nerves: originate from spinal cord; 31 pairs: ganglion: collection of neuron cell bodies outside cns, plexus: extensive network of axons, and sometimes neuron cell bodies, located outside cns. Divisions of pns: sensory(afferent):transmits action potentials from receptors to cns. afferent), motor(efferent):action potentials from cns to effectors (muscles, glands) Somatic nervous system: from cns to skeletal muscles. Synapse: junction of a nerve cell with another cell. E. g. , neuromuscular junction is a synapse between a neuron and skeletal muscle cell. Autonomic nervous system (ans): from cns to smooth muscle, cardiac muscle and certain glands. Two neuron system: rst from cns to ganglion; second from ganglion to effector.

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