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Lecture 6

Lecture 6: PNS

QuestionAnswer
Sensory Receptors respond to changes in their environment (stimulus)
Chemoreceptors chemicals in solution, respond to pH
Mechanoreceptors respond to pressure, touch, vibration, and stretch
Thermoreceptor respond to variations in temperature
Photoreceptors in retina of the eye, respond to light energy
Nociceptors can be thermo, chemo, and mechanoreceptors
Exteroceptors transducing information from the environment outside of the body organism
Interoceptors transducing information from the visceral environment
Proprioceptors transducing information about the position of the skeletal muscles and joints
Unencapsulated Dendritic Endings free nerve endings, mostly unmyelinated, respond primarily to temperature, pain, and pressure
Encapsulated Dendritic Endings one or more fiber terminals enclosed in a connective tissue capsule, virtually all are mechanoreceptos
Somatosensory System neural system that allows us to sense and perceive a stimulus
Receptive Field area of the skin whose stimulation results in the firing rate of the sensory neuron
Two-Point Touch Threshold gives the minimum distance at which two points of touch can be perceived as separate
Transduction translation of stimulus energy to neural languge
Phasic responds with high frequency of AP when stimulus is applied but then adapts, responds again when stimulus is removed
Tonic receptors maintain high frequency AP generation throughout the presence of the stimulus
1st Order Neuron sensory receptor in the PNS
2nd Order Neuron interneuron, found in the spinal cord
3rd Order Neuron interneuron, found in the thalamus
Spinothalamic Pathway carries sensations of pain, temperature, and coarse touch
Lateral and Medial Lemiscus Pathway carries sensations of light touch, vibration, pressure, and conscious proprioception
Created by: rlmurp09
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