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26 Cards in this Set
- Front
- Back
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The folding pattern itself has no cortical functional significance
T/F |
T
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Gyrus
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fold of gray matter (2-4 mm) over a central core of white matter
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Sulcus
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refers to a groove between adjacent gyri
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Majority gray matter is not on the surface T/F
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T
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Normally, _______ fills in between white matter making sulci very narrow
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gray matter
e.g., Alzheimer's causes a reduction in gray matter which enlarges sulci |
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The lateral surface of the hemisphere is divided into lobes by 2 large sulci -
What are they? (fissures) and 2 imaginary lines- What are they |
Sulci:
1)central sulcus (Rolandic fissure) 2)lateral sulcus (Sylvian fissure) Imaginary lines: 1)parietooccipital sulcus 2)preoccipital notch |
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4 lobes visible on the lateral surface
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Frontal
Temporal Occipital Parietal |
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12 names cover all gyri for the basic pattern on the lateral hemisphere
-What are they? |
Frontal:
sup. frontal mid. frontal inf. frontal Temporal: sup. temporal mid. temporal inf. temporal Occipital Parietal: Precenter Postcenter supramarginal |
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Two pairs of vertical parallel gyri and sulci are separated by _______
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the central sulcus
"pre" central = anterior, frontal; "post" central = posterior, parietal |
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Both the pre- and post- central gyri "spill over" onto the medial surface and interconnect around the end of the _______
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central sulcus
*Central sulcus is variable as to how far it extends down the medial side |
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paracentral lobule
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The gyrus surrounding the end of the central sulcus
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Brodmann area 4 - primary motor cortex
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Most of the precentral gyrus including the medial surface
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Brodmann areas 3,1, 2 - primary somatosensory cortex
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postcentral gyrus, including the medial surface
-the surface (top) of the gyrus forming the banks on either side |
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Different regions are associated with different numbers of
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body motor cells
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Mapping of the motor cells on the precentral gyrus forms the
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motor homunculus
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motor homunculus
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headless body standing on the cingulate gyrus and draped over the lateral surface, holding its head by the hair
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sensory homunculus
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on the postcentral gyrus is similar, but with a larger face area and the addition of the genitals on the medial surfface
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The three frontal gyri are separated by
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two sulci
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Superior frontal gyrus is better seen in
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superior view
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Frontal Lobe contains -
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See slide 17 --
-The supplementary motor and premotor areas (BA6) -The frontal eye fields (8) plan eye movements -Broca's area (BA 44, 45) is involved in speech -The frontal pole is involved in higher functions (thinking, cognition, personality) |
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The three temporal gyri are separated by
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two sulci:
superior temporal gyrus SUPERIOR TEMPORAL SULCUS middle temporal gyrus INFERIOR TEMPORAL SULCUS inferior temporal gyrus |
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Weirneike's area is located where?
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superior temporal gyrus
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The sulci on either side of the superior temporal gyrus lead to two named gyri of the parietal lobe.
What are they? |
supramarginal gyrus (from lateral sulcus)
angular gyrus (from superior temporal sulcus) |
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Lateral fissure leads to the ________ which surrounds its upper end
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supramarginal gyrus
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The superior temporal fissure leads to the ________ which surrounds its upper end
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angular gyrus (BA 40)
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The angular gyrus is just in front of
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the imaginary line connecting the preoccipital notch with the superior end of the parietooccipital sulcus on the medial surface.
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