A few notions of brain anatomy
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1 A few notions of brain anatomy Christophe Pallier CNRS, INSERM 562, Orsay, France Note some slides were taken from lectures available from the excellent web site 'fmri for dummies' by Jody Culham.
2 Drawing from H. Phillips & C. Tollet
3 Images from The Virtual Hospital (
4
5 Cortex (vs. subcortical structures) Total surface area of the cerebral cortex = 2,500 cm2 (elephant = 6300; dolphin =3750) Number of neurons ~ 1010 (glial cells ~ 10~50 times more) Cortex thickness ~ 1.5 to 4 mm
6 Brodmann s Areas Brodmann (1905): Based on cytoarchitectonics: study of differences in cortical layers between areas Most common delineation of cortical areas More recent schemes subdivide Brodmann s areas into many smaller regions Monkey and human Brodmann s areas not necessarily homologous fmri for Dummies
7 Interhemispheric Fissure -hugely deep (down to corpus callosum) -divides brain into 2 hemispheres Intrahemispheric Fissure fmri for Dummies
8 Sylvian Fissure -hugely deep -mostly horizontal -insula (purple) is buried within it -separates temporal lobe from parietal and frontal lobes Sylvian Fissure
9 Superior and Inferior Temporal Sulci Superior Temporal Sulcus (red) -divides superior temporal gyrus (peach) from middle temporal gyrus (lime) Inferior Temporal Sulcus (blue) -not usually very continuous -divides middle temporal gyrus from inferior temporal gyrus (lavender)
10 Central, Postcentral and Precentral Sulci Precentral Sulcus (red) Central Sulcus (red) -usually freestanding (no intersections) -just anterior to ascending cingulate -often in two parts (superior and inferior) -intersects with superior frontal sulcus (T-junction) -marks anterior end of precentral gyrus (motor strip, yellow) Postcentral Sulcus (red) -often in two parts (superior and inferior) -often intersects with intraparietal sulcus -marks posterior end of postcentral gyrus (somatosensory strip, purple) ascending band of the cingulate fmri for Dummies
11 Penfield homonculus
12 Superior and Inferior Frontal Sulci Superior Frontal Sulcus (red) -divides superior frontal gyrus (mocha) from middle frontal gyrus (pink) Inferior Frontal Sulcus (blue) -divides middle frontal gyrus from inferior frontal gyrus (gold) orbital gyrus (green) and frontal pole (gray) also shown Frontal Eye fields lie at this junction fmri for Dummies
13 Early Visual Areas
14 Parieto-occipital Fissure and Sulcus Cuneus Calcarine (pink) Parieto-occipital fissure (red) -very deep -often Y-shaped from sagittal view, X-shaped in horizontal and coronal views -visual areas on medial side above calcarine (lower visual field) Lingual gyrus (yellow) -visual areas on medial side below calcarine and above collateral sulcus (upper visual field) Calcarine sulcus (blue) -contains V1 POS CS lg ua ng Li us yr fmri for Dummies
15 Atlases on the web
16 Brains are Heterogeneous Slide from Duke course fmri for Dummies
17 Gyral variability Cachia, Magin, Riviere et al., MICCAI 2002, Medical Image Anal., 2003
18 Variability of Sulci Source: Szikla et al., 1977 in Tamraz & Comair, 2000 fmri for Dummies
19 A database of manually labelled sulci Jean-Francois Mangin & Denis Riviere, SHFJ, Orsay
20 Exercices Open an anatomical scan with Anatomist and/or mricro. Find the corpus callosum, the cerebellum, the thalamus.
21 Exercice 2: Find heschl gyrus
22 Exercice: Repérer le sillon central? 1 Sur une coupe sagittale 2 Repérer le sillon calloso-marginal (1): au dessus dugyrus cingulaire (2), Encoche en avant : sillon central (3). IRM: coupe sagittale
23 Comment repérer le sillon central? - repérer le sillon précentral qui croise à sa partie supérieure le sillon frontal supérieur sillon central : 1ère scissure verticale située en arrière du sillon pré central. IRM: coupe axiale Sur une coupe axiale
24 Localiser le cortex moteur primaire
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