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Cerebrum 4 5 6 7 8 Cerebral hemispheres • Each of them has: • 3 poles : – Frontal, Occipital, Temporal • 3 Borders : – Superior, inferomedial & inferolateral • 3 Surfaces : – Superolateral, medial & inferior – Inferior surface : orbital & tentorial 9 Defining the lobes frontal lobe central (rolandic) sulcus parietal lobe occipital lobe temporal lobe sylvyan (lateral) sulcus 12 Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM) Sulci of medial view • Cingulate sulcus • Parieto – occipital sulcus • Calcarine sulcus 15 17 Sulci of inferior view • Tentorial portion: – Collateral sulcus – Fronto - occipital sulcus • Orbital portion – Oribital sulci 18 Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM) © 2005 Elsevier Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM) © 2005 Elsevier Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM) © 2005 Elsevier Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM) © 2005 Elsevier Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM) © 2005 Elsevier Primary Motor Cortex 31 Somatic Sensory Cortex 32 33 Downloaded from: Gray's Anatomy (on 29 November 2006 05:36 AM) © 2005 Elsevier © 2005 Elsevier Brain white mater • Association fibers: – Short association fasciculus – Long association: • Superior long association fasciculus • Inferior long association fascculus • Uncinate (frontotemporal) fasciculus – Commissural fibers: – – – – Corpus callosum Fornix Anterior commisure Posterior commisure • Projection fibers – Ascending – Descending 40 Cortical white matter: links with other brain structures 1) Projection fibres: between cortex and subcortical structures Fibres form: corona radiata (fan-like arrangement), converge and concentrate to form the internal capsule 2) Commissural fibres: inter-hemispheric connection • Main system: Corpus callosum (CC) • Anterior commissure: connects temporal fields • Hippocampal commissure (Fornix) 3) Association fibres: intra-cortical connections • short, U-fibres arching beneath adjacent sulci • long, travel through white matter 41 42 46 49 50 51