17Su11Lec1bNeuroanat - CS17 Neurobiology of Cognition...

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CS17 Neurobiology of Cognition Spring 2011 Lecture 1b: Anatomy of the Nervous System, Continued Cerebral Cortex = “Cortex” = “Bark”, Outermost structure, covering most of brain, Evolutionarily recent, esp expanded in humans - 6 layers (lamina), Highly convoluted, 2/3 hidden in folds, if unfolded = ~ 2.5 ft 2 sheet, 3 mm thick - Bulges: Gyri (singular: Gyrus), Folds: Sulci (singular: Sulcus) or Fissures (if very deep) - Corpus Callosum - inferior to Cingulate Gyrus, superior to rest of Limbic System = A bundle of axons communicating between the two hemispheres of the Cerebral Cortex - Cerebral Cortex is divided into four lobes: Occipital, Temporal, Parietal, Frontal - Central Sulcus divides Parietal from Frontal, Lateral Sulcus marks Temporal from rest of cortex Occipital Lobe: (ventral posterior) Visual Processing - - Includes primary projection area (V1 or Striate) from LGN of Thalamus & some higher visual areas - Topo-map of near (foveal) and far fields, plus range of spatial frequencies (e.g. high for faces, low for setting) Temporal Lobe: (lateral) Audition, Language Comprehension & Higher Visual - - Includes primary projection area (A1) from MGN of Thalamus & higher Auditory areas including Wernickes Area (in Left hemisphere) involved in language comprehension - Also includes highest visual area (IT = Inferior Temporal) along “ What ” Visual pathway - Also implicated in Emotional expression and interpretation, especially Right
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17Su11Lec1bNeuroanat - CS17 Neurobiology of Cognition...

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