Sensory phys and Somatic Reflexes

Sensory phys and Somatic Reflexes - SensoryPhysiology...

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Sensory Physiology
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• General senses – Pain – Temperature – Physical distortion – Chemical detection • Receptors for general senses scattered throughout the body • Special senses – Located in specific sense organs – Structurally complex Senses
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Sensory Physiology • Sensations & Perceptions – sensation ­ is an awareness of sensory stimuli in brain – perception ­ meaningful interpretation or conscious understanding of sensory data
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Sensory Receptor Types Sensory Receptor Types Receptor is part of neuron: AP triggered if receptor potential above threshold Specialized receptor cell: Amount of NT released & stimulus strength
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5 COMPONENTS of SENSORY PHYSIOLOGY I. Sensory modalities (receptors)­ structures that detect changes in external & internal environment modified neurons or epithelial cells that have evolved to respond to stimuli (eye, ear, nose)
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5 COMPONENTS of SENSORY PHYSIOLOGY II . Reception ­ ability of receptor to absorb energy of a stimulus III . Transduction ­ conversion of stimulus energy into membrane potential IV . Transmission ­ receptor potentials transmitted via AP's to CNS V . Integration ­ processing of frequency of receptor potentials
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Somatic sensibility has four major modalities discriminative touch ­required to recognize the size, shape, and texture of objects and their movement across the skin. proprioception ­ the sense of static position and movement of the limbs and body. nociception ­the signaling of tissue damage or chemical irritation, typically perceived as pain or itch. temperature sense ­warmth and cold
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4 Types of Sensory Receptors 1. Chemo­ (specific ligands) and Osmo­ (conc. of solutes) 2. Mechano­ (touch, pressure, vibration, stretch) 3. Thermo­ (temp. change) n Cold receptors lower than body temp. n Warm receptors ( 37 ­ 45 o C) > 45 o C ? 4. Photo­ (light)
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Classes of Sensory Receptors mechano­receptors : mechanical forces ­ stretching alters membrane permeability (1) hair cells (deflection = depolarization = AP's) (2) stretch receptors of muscles (3) equilibrium receptor of inner ear (4) receptors of skin (touch, pain, cold, heat) chemo­receptors : chemicals sense solutes in solvents, taste, smell osmo­receptors : of hypothalmus which monitors blood osmotic pressure photo­receptors : light ­ eye thermo­receptors : radiant (heat) energy phono­receptors : sound waves electro­receptors : detect electric currents noci­receptors : pain receptors. .. naked dendrites of skin (epidermis)
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• Found in the dermis • Mechanoceptors: sensitive to distortion of their membrane – 3 types • Tactile receptors (six types) • Baroreceptors • Proprioceptors (three groups) – Muscle spindles – Golgi tendon organs – Receptors in joint capsules Thermoceptors and mechanoceptors
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Tactile Receptors in the Skin
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Touch (pressure) Touch (pressure)
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Baroreceptors and the Regulation of Visceral Function
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Figure 15.5 Chemoreceptors – Carotid bodies – Aortic bodies
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• First order neurons – Sensory neurons that deliver sensory
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This note was uploaded on 12/08/2011 for the course AMY 2A taught by Professor Jamesivey during the Spring '06 term at Riverside Community College.

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Sensory phys and Somatic Reflexes - SensoryPhysiology...

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