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Lecture

Lecture 02


Department
Psychology
Course Code
PSYB65H3
Professor
Ted Petit

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PSYB65 LECTURE 02: CEREBRAL CORTEX
CEREBRAL CORTEX
in greater detail divided into lobes Not smooth surface in humans try to add
on cells (evolution pressure) move back & fold (groves) mountains & valleys 
gives boundaries
oValley called sulcus/ sulci
oMountain called gyrus/gyri
Top of brain 2 side of brain is not connected directly is connected by board fibre
pathway called Corpus Callosum Divided into 2 hemisphere :
oRight : control left side of body & gets info from this side as well
oLeft : control right side of body & gets info from this side as well
oIt connects in analogs portion to each side e.g. anterior side is connected to
other side of anterior part
3 main fissures ( when sulci gets really deep called fissure)
oLongitudinal Fissure right down the middle separate right & left
hemisphere
oCentral Sulcus / Fissure on each hemisphere it separates anterior &
Posterior portion (Frontal & Parietal)
Precentral Gyrus posterior frontal lobe
Postcentral Gyrus anterior Parietal Lobe
oSylvian/ Lateral Fissure separates lobes at the bottom beneath the
fissure is the Temporal Lobe
Cerebral cortex is sub divided into lobes: 4 of them diff parts have diff functions:
oFrontal Lobe at the front
oParietal Lobe behind the frontal lobe / behind the Central Sulcus
oOccipital Lobe at the very back of head/brain
oTemporal Lobe is the portion below the Sylvian Fissure
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Each lobe has primary function Primary Cortex (that deals w/ primary function of
lobe) & Associational Cortex
oPrimary Cortex primary receptive area either it is getting input from
sensory modality (e.g. skin) / if it is the motor cortex (motor output)
oAssociational cortex surrounds/ beside the Primary cortex & deals w/
greater computing part of processing ( e.g. it not just getting info from the eye
its puts info together to make some sense) means most recent in evolution
most evolved animals have greater percentage of Associational Cortex
relative to Primary Cortex
Brodmen decided to map brain according to functions put #s on it used today
primary cortex have #s
oFrontal : 4 &6
oParietal 3, 1 &2
oOccipital 17 (primary receptive area for vision info from eyes)
oTemporal 41 (primary receptive are for ears hearing)
Frontal Lobe
Beings anterior portion of brain continue back until it hits central sulcus
Primary function to control motor movement
as you move more anterior in the lobe Associational Cortex its involved in
planning (ahead), inhibiting inappropriate behaviour, visceral sensations
Primary Cortex : refers to as Primary Motor Strip or Precentral Gyrus (at the front
of Central Sulcus has to be mountain/gyrus) it is the Brodmen Area 4& 6 
involved in motor control
oMotor strip is organized symmetrically in homunculus (upside little tiny
person in brain) top around to the side:
At the top & close to Central Sulcus: foot (toes), then as you move to
the edge/side leg, knee, hip, trunk, shoulder, arm, elbow, wrist,
hand, fingers, thumb, neck, brow, eye, face, lips, jaw(teeth & gums),
tongue, swallowing (pharynx)
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