BIOL121 Lecture Notes - Lecture 10: Central Nervous System, Peripheral Nervous System, Efferent Nerve Fiber

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13 Oct 2018
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Sensory (unipolar) neurons convert external stimuli ie light, heat etc into internal stimuli and then transmit them to the central nervous system. These are also called afferent nerves ie message from sense organs to the brain. Motor (multipolar) neurons which carry processed signals from the central nervous system to effector organs. 3. 3 discuss what the somatic nervous system controls and what the autonomic nervous system controls. It is controlled by the hypothalamus and medulla oblongata autonomic nervous system. 3. 5 sketch and label the structure of a typical neuron; dendrites, cell body, axon, nodes of ranvier, axon terminals. 3. 8 describe what myelin sheath is and why it is important: this is simply an insulating sheath that wraps around an axon. It consists of multiple layers of neuroglia membrane. It significantly increases the nerve impulse propagation rate along the axon. Presynaptic cell: this sends the message, and includes the axon terminal.

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