a-049 rc 211 a. brain anatomy made easy
TRANSCRIPT
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Brain Anatomy Made Easy
TA YousryInstitute of Neurology
National Hospital for Neurology and Neurosurgery
Queen Square
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Subdivision of the cortex
Lobes
Gyri Location of primary functional cortex
Sensorimotor
Audition
Vision
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Cortical Subdivisions
Surface Lobes Gyri and Sulci Cytoarchitectonic
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Surface
Medial Lateral (convexity) Inferior (basal)
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Lobes
Current concept
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Lobes
Current concept
1) Frontal L 2) Parietal L
3) Temporal L 4) Occipital L
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Lobes
Current concept
1) Frontal L 2) Parietal L
3) Temporal L 4) Occipital L
5) Insula
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Lobes
Current concept
1) Frontal L 2) Parietal L
3) Temporal L 4) Occipital L
5) Insula 6) Limbic L
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Lobes
Current concept
1) Frontal L 2) Parietal L
3) Temporal L 4) Occipital L
5) Insula 6) Limbic L
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Lobes
Convexity
Frontal Parietal Temporal Occipital Insula
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Lobes
Medial surface
Frontal Parietal Temporal Occipital Limbic
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1. Lateral SurfaceFrontal lobe
3+1 Superior frontal
gyrus (F1) Middle (F2) Inferior (F3) Precentral G
(Transverse)
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1. Lateral SurfaceTemporal lobe
3+1 Superior temp
gyrus (T1) Middle (T2) Inferior (T3)
Heschl’s gyrus (Transverse G)
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1. Lateral Surface
Occipital lobe
3 Superior occip
gyrus (O1) Middle (O2) Inferior (O3)
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1. Lateral Surface
Parietal lobe Postcentral G Superior parietal
Lobule (P1) Inferior parietal
Lobule (P2) Supramarginal G Angular G
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2. Medial Surface
Frontal lobe Gyrus rectus Sup frontal gyrus Parac. lobule (ant)
Parietal lobe Parac. lobule (post) Precuneus
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2. Medial Surface
Occipital lobe Cuneus Lingual gyrus
Limbic lobe Limbic gyrus Intralimbic gyrus
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3. Inferior Surface
Frontal lobe Gyrus rectus Orbital gyri
Medial/Lateral/Anterior/Posterior
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TP Naidich, Mount Sinai, New York
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3. Inferior Surface
Temporal/Occipital lobes Inferior temporal/occipital gyrus (T3/O3) Fusiform gyrus (T4/O4) (lateral
occipito-temporal) Parahippocampal/Lingual gyrus (T5/O5)
(medial occipito-temporal)
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TP Naidich, Mount Sinai, New York
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Lobes
The subdivisions of the cerebrum are
purely arbitrary and do not correspond
exactly to any known functional
divisionsG. Yasargil
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I. Primary Sensorimotor
Cortex
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Motor Strip
Functional Organization
Somatotopie (Homunculus)
Precentral G
Postcentral G
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Central Region
Components
Precentral gyrus Postcentral gyrus Paracentral lobule Subcentral gyrus
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Methods of Identification
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Cerebral Landmarks Axial
1. L sign 3. PrCG/Cortex Thickness/SI
2. Knob/Ω/ε 4. Bracket-Moustache-PM Sagittal
1. Medial sagittal (Pars marginalis)2. Knob/Hook3. Lateral sagittal
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1st Axial Landmark“L” Sign
Lateral axial (Kido)
SFS—PreCS (88%)
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2nd Axial Landmark
“Knob/Ω/ε” Sign
Knob (Yousry)
MHA (Genu medius)
(96%)
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(90%) (10%) At SFS-PreCS junction (100% – path; 96% + path)
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3rd Axial LandmarkThickness: Gyrus, Cortex - SI
a) Gyral thickness (Naidich)
PrecG > PostCG
(98%)
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9.4T
TP Naidich, Mount Sinai, New York
Cortical thickness
3rd Axial Landmark Thickness: Gyrus, Cortex - SI
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3rd Axial Landmark Thickness: Gyrus, Cortex - SI
b) Cortical thicknessGPrec > GPostC
(Meyer 96)
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Biega et al. AJNR 06
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3rd Axial Landmark Thickness: Gyrus, Cortex - SI
c) Cortical SICS < Frontal
(Karaarslan 03)
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4th Axial LandmarkBracket-Moustache-Pars Marginalis
Medial axial (Naidich)
CS into Pb in 87%
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A-028.jpgTP Naidich, New York
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PARS MARGINALIS - LOW
TP Naidich, Mount Sinai, NY
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PARS MARGINALIS - HIGH
TP Naidich, Mount Sinai, NY
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1st Sagittal LandmarkPars Marginalis
Medial sagittal
CS anterior
PM
Notch in
Paracent lob
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2nd Sagittal LandmarkKnob/Hook
Hook (91% pathology)
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3rd Sagittal Landmark Lateral sagittal (Naidich)
Sylvian fissureAnt horiz rAnt asc rIFSIFG (M)PreCSCS
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3rd Sagittal Landmark Lateral sagittal (Naidich)
Sylvian fissureAnt horiz rAnt asc rIFSIFG (M)PreCSCS
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3rd Sagittal Landmark Lateral sagittal (Naidich)
Sylvian fissureAnt horiz rAnt asc rIFSIFG (M)PreCSCS
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3rd Sagittal Landmark Lateral sagittal (Naidich)
Sylvian fissureAnt horiz rAnt asc rIFSIFG (M)PreCSCS
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3rd Sagittal Landmark Lateral sagittal (Naidich)
Sylvian fissureAnt horiz rAnt asc rIFSIFG (M)PreCSCS
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3rd Sagittal Landmark Lateral sagittal (Naidich)
Sylvian fissureAnt horiz rAnt asc rIFSIFG (M)PreCSCS
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Recognition System
AXIALAnatomic 1) Knob
2) “L” SFS-PreCS opposite to Knob
3) Moustache/Pars Bracket4) PreCG > PoCG
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Recognition System
SAGITTALAnatomic 1) Ant Asc—Horiz Ramus
2) Hook
3) Pars Bracket
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II. Primary Auditory Cortex
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Auditory pathway
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Heschl’s Gyrus
Axial
Course
Anterolateral Landmark
Adhaesio interthalamica
Internal cerebral veins
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Heschl’s GyrusSagittal Shape
Omega (medial)Heart (Sulcus intermedius of
Beck) Posterior border
Heschl’s Sulcus
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Heschl’s Gyrus
Coronal
ShapeOmega (medial)
Landmark
Tent-like shape of the fornices
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V5 ACTIVE
Morosan et al. Neuroimage 2001
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Rademacher Neuroimage 2001
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SummaryPrimary Audition – Heschl’s gyrusAxial Adhaesio interthalamica
Sagittal Omega—Heart
Coronal Omega
Cytoarchitectonic variations of Te1
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III. Primary Visual Cortex
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PARIETO-OCCIPITAL CONFIGURATION
LAZY - Y
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CALCARINE SULCUS PATTERNS
R L
SINGLE PEAK 38 32
PLATEAU 26 28
ONO ATLAS of the CEREBRAL SULCI 1990
TP Naidich, Mount Sinai, NY
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CALCARINE SULCUS PATTERNS
R L
DOUBLE PEAK 16 20
S-SHAPED 12 16
TRIPLE PEAK 8 4ONO ATLAS of the CEREBRAL SULCI 1990 TP Naidich, Mount Sinai, NY
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L L
RR
TP Naidich, Mount Sinai, NY
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II
Courtesy TP Naidich
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Visual Cortex Anatomy
Primary visual cortex (V1) contains visual stria of Genari (striate cortex)
Extrastriate Visual Cortex (V2-V5)
V1 V3 V4 V5
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Variability of BA 17
Amunts et al. NeuroImage 2000
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Variability of BA 17
Amunts et al. NeuroImage 2000
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SummaryPrimary Vision– Calcarine SulcusSagittal Lazy – Y
Cytoarchitectonic variations of BA 17
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Summary
Subdivisions of the cortex
Surfaces 3
Lobes 6
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SummarySensorimotor – Central regionAxial 1) Knob
2) SFS-PreCS opposite to Knob
3) Pars Bracket-Moustache4) PreCG > PoCG
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SummarySensorimotor – Central regionSagittal 1) Ant Asc—Horiz Ramus
2) Hook
3) Pars Marginalis
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SummaryPrimary Audition – Heschl’s gyrusAxial Adhaesio interthalamica
Sagittal Omega—Heart
Coronal Omega
Cytoarchitectonic variations of Te1
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Summary
Importance of the surface anatomyAnatomic-functional relationship