L19-2010 - BioNB222 Cornell University Spring 2010 Andrew...

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BioNB222 Spring 2010 Cornell University Andrew Bass Lecture 19: Neural Systems for Sensory Maps Reading Assignment Purves, D. , Augustine, G. J., Fitzpatrick, Hall, W.C. LaMantia, A.-S., McNamara, J.O. and White, L. E. (2008) Neuroscience. Sinauer Associates, Inc. Sunderland, Mass. Chapter 9 ( P: indicates that figure is in Purves textbook ) Learning Objective: To understand how maps of our sensory world are formed in the cerebral cortex. Lecture Outline A. Cerebral Hemispheres 1. The cerebral hemispheres are divided into 4 lobes (P - Fig. A3, p. 818) . The cortex is folded, forming ridges called gyri (gyrus is singular) and grooves called sulci (sulcus is singular). 2. Cerebral cortex is “roof” of cerebral hemisphere ( P – Fig. 18.1 next page ). 3. The “floor” of the cerebral hemisphere has many divisions, including the basal ganglia (caudate, putamen & globus pallidus) ( P – Fig. 18.1 ). These are discussed further in lecture 26.
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BioNB222 Spring 2010 Cornell University Andrew Bass 4. Each hemisphere has a lateral ventricle that is part of an elaborate system of ventricular spaces that are continuous throughout your entire brain and with the central canal of your spinal cord ( P- Fig. A21, p. 841 ). The ventricles are filled with cerebrospinal fluid (CSF).
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BioNB222 Spring 2010 Cornell University Andrew Bass B. Cerebral cortex is functionally divided into 3 major categories ( P – Fig. 26.1 ): 1. Sensory cortex : A region of cortex dominated by information processing for one sensory system, e.g. vision, olfaction, hearing, somatosensation. Primary sensory cortices (plural for cortex) analyzes the characteristics of sensory input, for example the color, shape and movement of visual images. Secondary and higher order sensory cortices combine these attributes into patterns (e.g., faces).
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