KP161 Chapter Notes - Chapter 4: Central Nervous System, Optic Chiasm, Peripheral Nervous System
12 Feb 2018
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Nervous system is responsible for processes behind movement, preparation, execution and control. It is divided into two parts: central nervous system (cns) brain and spinal cord, peripheral nervous system (pns) nerves extending from brain to spinal cord. Sensory receptors: stimuli which are detected through components of the nervous system. Exteroceptors: detect stimuli outside the body adn provide information about the environment. Interoceptors: detect stimuli from the internal viscera and provide information about the internal environment, leading to feelings such as hunger and nausea. Proprioceptors: located in the muscles, tendons, joints and internal ear, provide information regarding the body position and movement by detecting changes in the muscle tension, joint position and equilibrium. The visual system predominates every other sensory receptors. Electrical signals generated by the photoreceptors are sent to the brain via optic nerves. Optic chiasm: where the bers from each optic nerve cross.
