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Sensory systems 2
 

Sensory systems 2

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    Sensory systems 2 Sensory systems 2 Presentation Transcript

    • PHYSIOLOGY DEPARTMENT Ass. Prof. VASTYANOV Rooslan
    • SENSORY SYSTEMS #2SENSORY SYSTEMS #2 PHYSIOLOGY OF VISION
    • PLEASE, MOBILES SHOULD BE OFF
    • GENERAL STRUCTURE OF ANALYZERS - RECEPTOR CELLSPERIFERAL PART CONDUCTIVE PART CENTRAL PART - CONDUCTIVE WAYS - Subcortical structures and cortical areas
    • Eye Anatomy #1 Muscles Eye Anatomy #1 Muscles
    • Tear inflow and drainage Tear inflow and drainage
    • Eye Anatomy #2 Blood supply Eye Anatomy #2 Blood supply
    • Eye Anatomy #3 Extrinsic eye muscles, cranial nerve innervation and eyeball movement Eye Anatomy #3 Extrinsic eye muscles, cranial nerve innervation and eyeball movement
    • Eye Anatomy #4 Transverse View Eye Anatomy #4 Transverse View
    • Eye Anatomy #4 Lens Eye Anatomy #4 Lens
    • The inflow and drainage of an aqueous liquidThe inflow and drainage of an aqueous liquid
    • The scheme of accommodation The scheme of accommodation
    • Accommodation occurs by a reflex that has three components: Accommodation occurs by a reflex that has three components: (i) Bulging the lens. Contraction of the ciliary muscles releases the tension of the zonular fibers. The elastic capsule surrounding the lens retracts, increasing the convexity (and thus the power) of the lens (i) Bulging the lens. Contraction of the ciliary muscles releases the tension of the zonular fibers. The elastic capsule surrounding the lens retracts, increasing the convexity (and thus the power) of the lens (ii) Pupillary constriction. By reducing the area through which light can enter the eye spherical aberration s reduced that follows by depth of the focus increasing (ii) Pupillary constriction. By reducing the area through which light can enter the eye spherical aberration s reduced that follows by depth of the focus increasing (iii) Eyes convergence in order to both eyes were focused on the object.(iii) Eyes convergence in order to both eyes were focused on the object.
    • The function of the retina is to receive visual images, partially analyze them and transmit this modified information to the brain. The function of the retina is to receive visual images, partially analyze them and transmit this modified information to the brain.
    • Photosensor distribution, sensitivity in darkness and visual acuity of the retina Photosensor distribution, sensitivity in darkness and visual acuity of the retina
    • PHOTOSENSORSPHOTOSENSORS
    • THE SCHEME OF CHAIN REACTION OF PHOTOSENSORS ACTIVATION IN LIGHT AND IN THE DARKNESS THE SCHEME OF CHAIN REACTION OF PHOTOSENSORS ACTIVATION IN LIGHT AND IN THE DARKNESS
    • THE SUMMARIZED SCHEME OF THE RODS ELECTRICAL REACTIONS IN LIGHT AND IN THE DARKNESS THE SUMMARIZED SCHEME OF THE RODS ELECTRICAL REACTIONS IN LIGHT AND IN THE DARKNESS
    • The Layers of the Retina The Layers of the Retina
    • The Pigment Layer of the Retina The Pigment Layer of the Retina
    • Optic System of the EyeOptic System of the Eye
    • The schematized explanation of the spectrum nature The schematized explanation of the spectrum nature
    • The adequate stimulus for human visual receptors is light, which may be defined as electromagnetic radiation between the wave lengths of 770 nm (red) and 380 nm (violet). The adequate stimulus for human visual receptors is light, which may be defined as electromagnetic radiation between the wave lengths of 770 nm (red) and 380 nm (violet).
    • Rods and cones physiological sensitivity Rods and cones physiological sensitivity
    • The scheme illustrating some fundamental optic principles The scheme illustrating some fundamental optic principles
    • The schemes illustrating normal eye refraction (a) myopia (b) and hypermetropia (c) The schemes illustrating normal eye refraction (a) myopia (b) and hypermetropia (c)
    • THE SCHEME OF THE VISUAL PATHWAY AND VISUAL FIELD DEFICITS THE SCHEME OF THE VISUAL PATHWAY AND VISUAL FIELD DEFICITS
    • CORTICAL LOCALIZATION OF THE VISUAL, VISUAL ASSOCIATION, AUDITORY AND AUDITORY ASSOCIATION AREAS (lateral view) CORTICAL LOCALIZATION OF THE VISUAL, VISUAL ASSOCIATION, AUDITORY AND AUDITORY ASSOCIATION AREAS (lateral view)