视觉系统（PPT课件讲稿）The Visual System

Chapter 7 The visual System

Chapter 7 The Visual System

Content Sensory Receptor and Sense Organs ° Focusing on the retina Function of the retina

Content • Sensory Receptor and Sense Organs • Focusing on the Retina • Function of the Retina

Reference- Text book DY5TESO7n ①:有 卫计射”中二压” anong's GUYTON AND HALL. Textbook of view of Medical Physiology the Nervous Syst? erica TWELFTE EDITION secoND eDmoN 生理学 ysiology丿 Aum Mdmek-Ttbe Physiol Puros Reves 影3 MED LITE EDUC L Brooks SAUNDERS LANGE P21-22 P427-432 UNIT X The Nervous System Chapter 9: Vision P121-140443-458 B. The Special Senses

Reference – Text Book P21-22 P121-140 P427 – 432 P443 - 458 UNIT X The Nervous System: B. The Special Senses Chapter 9: Vision

Reference- Course Website Medical Physiology 道州曰?生物m 生理学双语课程 适用律程生字(x01210)生图字(m11生 入理可 界大生在检友门翻

Reference – Course Website

Section Sensory Receptor and Sense Organs

Section 1 Sensory Receptor and Sense Organs

Part I Sensory receptors specialized nerve cells that transduce energy into neural signals “ mode specific Law of Specific Nerve Energies: sensory messages are carried on separate channels to different areas of the brain detect a small range of energy levels Eye:400-700nM Ear:20-20,000Hz Taste buds: specific chemicals

Part 1 Sensory Receptors • specialized nerve cells that transduce energy into neural signals • “mode” specific – “Law of Specific Nerve Energies”: sensory messages are carried on separate channels to different areas of the brain • detect a small range of energy levels – Eye: 400-700 nM – Ear: 20-20,000 Hz – Taste buds: specific chemicals

Spectrum of the electromagnetic Wave ncreasing energy M Increasing wavelength 0.001 11010000.011 100 n nm nmnm cmcm X- UV Gamma rays rays light Infrared Microwaves Radio waves Visible light 380430 500 560600650 750 nm nm nm n

Spectrum of the Electromagnetic Wave

Somatic Sensory Free nerve e Expanded tip Tactile hair receptor Nerve Endings Pacinian Aeissner's Krauses corpuscle corpuscle corpuscle Ruffini's Golgi tendon Muscle endings apparat spindle Hall: Guyton and Hall Textbook of Medical Physiology, 12th Edition Copyright 2011 by Saunders, an imprint of Elsevier, Inc, All rights reserved

Somatic Sensory Nerve Endings

Stimulus Free Nerve endings Free nerve endings dendrites interspersed among other Unmyelinated cells/tissues pain, temperature, touch Cell body Simple neural receptor

Free Nerve Endings • dendrites interspersed among other cells/tissues • pain, temperature, touch

Encapsulated Stimulus Nerve endings Layers of connective tissue Enclosed nerve nding · dendrites with special supporting structures Myelinated axor · mechanoreceptors Cell bod and proprioceptors Comley neural redentor

Encapsulated Nerve Endings • dendrites with special supporting structures • mechanoreceptors and proprioceptors