106L11_notes - Introduction to Neuroscience Lecture 11:...

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1 Introduction to Neuroscience Lecture 11: Visual System II. The Central Visual System Reading Assignment: Bear et al., Ch. 10 CBNS 106 2 Introduction • Neurons in the visual system – Neural processing resulting in perception • Parallel pathway serving conscious visual perception originate in the retina – Progress to lateral geniculate nucleus, areas in temporal and parietal lobes
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2 CBNS 106 3 The Retinofugal Projection • The Optic Nerve, Optic Chiasm, and Optic Tract CBNS 106 4 The Retinofugal Projection • Right and Left Visual Hemifields
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3 CBNS 106 5 The Retinofugal Projection • Targets of the Optic Tract CBNS 106 6 The Retinofugal Projection • Targets of the Optic Tract
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4 CBNS 106 7 The Retinofugal Projection • Targets of the Optic Tract CBNS 106 8 The Retinofugal Projection • Targets of the Optic Tract
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5 CBNS 106 9 The Retinofugal Projection • Nonthalamic Targets of the Optic Tract: – Hypothalamus: Biological rhythms, including sleep and wakefulness – Pretectum: Size of the pupil; certain types of eye movement – Superior colliculus: Orients the eyes in response to new stimuli (saccadic eye movements) CBNS 106 10 The Lateral Geniculate Nucleus (LGN)
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6 CBNS 106 11 The Lateral Geniculate Nucleus (LGN) • The Segregation of Input by Eye and by Ganglion Cell Type CBNS 106 12 The Lateral Geniculate Nucleus (LGN) • Receptive Fields – Receptive fields of LGN neurons: Identical to the ganglion cells that feed them – Magnocellular LGN neurons: Large, monocular receptive fields with transient response – Parvocellular LGN cells: Small,monocular receptive fields with sustained response
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7 CBNS 106 13 The Lateral Geniculate Nucleus (LGN) • Nonretinal Inputs to the LGN
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106L11_notes - Introduction to Neuroscience Lecture 11:...

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