PSYB65 LEC2 (C4):
Cerebral Cortex, Vascular Supply, Ventricular System
-convolutions, sulci, gyri
-gyri: mountains
-sulci: valley
-big sulci a.k.a. fissure
-hemispheres are connected by a large fibre pathway called corpus collosum
-connections are not random, specific portions connect directly to opposite location on
other hemisphere
4 major lobes: frontal, temporal, occipital and parietal
frontal: motor and planning, etc.
parietal: sensory
temporal: hearing
occipital: vision
each lobe has primary cortex and association/secondary cortex
-association areas are often (always?) larger than primary areas
-the higher the proportion of association to primary cortex, the more evolved is the
species
frontal lobe- Brodman’s areas 4 and 6
-posterior border is at central sulcus
-primary motor strip is the “precentral gyrus” right in front of central sulcus
primary function is motor movement and control
-also involved in planning, inhibition of inappropriate behaviours, visceral sensations
parietal lobe- Brodman’s areas 3, 1 and 2
-begins at central sulcus and goes posterior until it hits occipital lobe
-receives somatosensory information, excludes sound and vision
-primary cortex in post-central gyrus, just behind central sulcus
Occipital lobe- Brodman’s area 17
-function is vision
-from parietal back to posterior of brain
-receives information from the eyes
-primary visual receptive area (area 17) is where the info from eyes enters
-association cortex used for recognition, etc.
temporal lobe
-ventral to sylvian fissure
-major function is audition
-primary auditory receptive area is area 41 (pale green in slide)
-association areas involved in comprehension on speech, music cerebral ventricles
-space filled with fluid: cerebrospinal
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