LS2 Lec 9 Sensory (2 Slides)

LS2 Lec 9 Sensory (2 Slides) - Life Sciences 2 Sensory...

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1 Life Sciences 2 Sensory Systems Chapter 45 Dr. Jospeh Esdin Sensory Cells and Transduction of Stimuli Sensory cells transduce physical or chemical stimuli into signals that are transmittable and interpretable • Most sensory cells (or receptor cells ) are modified neurons, specialized for detecting different kinds of stimuli, such as pressure, heat, or light.
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2 Types of Receptors • Photoreceptors • Mechanoreceptors • Chemoreceptors • Thermoreceptors • Nocireceptors • Electroreceptors • Magnetoreceptors Hair Cell Olfactory Neuron Pacinian corpuscle Types of Sense Cells
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3 Mechanoreceptors • Mechanoreceptors are found deeper in the skin: Pacinian corpuscles provide information about vibrating stimuli of higher frequencies • Dendrites of sensory neurons are also wrapped around hair follicles, which detect displacement of the hairs Pacinian corpuscle Sensory in the Skin Nerve fiber Epidermis Dermis
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4 Pacinian Corpuscle Axon of afferent neuron Connective tissue layers Pacinian corpuscle Dendrite Receptor Acuity Receptive Field Size Stimulate less Stimulate less Stimulate most
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5 Receptor Acuity Transmission continues Transmission stopped Transmission stopped Sound • Sound is the vibration of air molecules • Waves of vibrations can have – High amplitude (loudness) – Frequency (pitch)
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6 Pinna External auditory canal Tympanic membrane Malleus Incus stapes Oval window Semicircular canals Cochlea Round window Auditory tube How Is Sound Transmitted? How Is Sound Transmitted? • Vibration of air molecules go through the pinna, passing through the external auditory canal • The air then vibrates the tympanic membrane which cause the three ossicles to vibrate
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This note was uploaded on 11/18/2009 for the course LS 252006217 taught by Professor Esdin during the Spring '09 term at UCLA.

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LS2 Lec 9 Sensory (2 Slides) - Life Sciences 2 Sensory...

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