IMED1001 Study Guide - Final Guide: Stimulus Modality, Afferent Nerve Fiber, Sensory Neuron
Document Summary
Ra (phasic) neurones respond poorly to steady stimuli. First order neuron determines whether conduction may be fast or slow. Ability to distinguish between two spatially separate stimuli. Each sensory nerve fibre transmits only one modality of sensation to a specific location. Receptor does not dictate what the brain will understand, the location of the afferent nerve does. Action potentials in labelled lines generate specific sensory percept. If a pain fibre is stimulated, you will perceive pain no matter what type of stimulus excites the fibre! Sensation from the skin, muscles, bones, tendons and joints. Tactile sense (touch, pressure, vibration, tickle) Propriocept (static position, rate of movement) Initiated by a variety of somatic receptors. Free nerve endings (slowly adapting, variable gating) Continuous light touch (steady state info) a fibres. Encapsulated nerve endings (wrapped in glial cells/connective tissue) Lamellar (pacinian) corpuscle (rapidly adapting mechanosensor)
