Chapt14 part2

Chapt14 part2 - 14-9 The Cerebrum•The Cerebrum–Is the...

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Unformatted text preview: 14-9 The Cerebrum•The Cerebrum–Is the largest part of the brain–Controls all conscious thoughts and intellectual functions–Processes somatic sensory and motor information14-9 The Cerebrum•Gray Matter–In cerebral cortexand basal nuclei•White Matter–Deep to basal cortex–Around basal nuclei14-9 The Cerebrum•Structures of the Cerebrum–Gyri of neural cortex•Increase surface area (number of cortical neurons)–Insula (“island” of cortex)•Lies medial to lateral sulcus–Longitudinal fissure•Separates cerebral hemispheres–Lobes•Divisions of hemispheres14-9 The Cerebrum•Structures of the Cerebrum–Central sulcus divides:•Anterior frontal lobe from posterior parietal lobe–Lateral sulcus divides:•Frontal lobe from temporal lobe–Parieto-occipital sulcus divides:•Parietal lobe from occipital lobeFigure 14-12a The Brain in Lateral Viewateral sulcusPonsMedulla oblongataFRONTALLOBECentral sulcusTEMPORAL LOBELateral view, cadaver brainCerebellumOCCIPITALLOBEPARIETAL LOBEFigure 14-12b The Brain in Lateral ViewFRONTALLOBEPrecentralgyrusCentralsulcusPostcentralgyrusLateral sulcusPonsPARIETAL LOBEOCCIPITALLOBETEMPORALLOBECerebellumMedulla oblongataLateral viewFigure 14-12c The Brain in Lateral ViewInsulaRetractors along the lateralsulcus showing the insulaFigure 14-12d The Brain in Lateral ViewCentral sulcusPostcentral gyrusPARIETAL LOBEOCCIPITAL LOBEParieto-occipital sulcusCerebellumPonsMedulla oblongataMidsagittal sectionTEMPORAL LOBEFRONTALLOBEPrecentral gyrusCingulategyrus14-9 The Cerebrum•Three Functional Principles of the Cerebrum1. Each cerebral hemisphere receives sensory information from, and sends motor commands to, the opposite side of the body2. The two hemispheres have different functions, although their structures are alike3. Correspondence between a specific function 14-9 The Cerebrum•White Matter of the Cerebrum–Association fibers•Connections within one hemisphere–Commissural fibers•Bands of fibers connecting two hemispheres–Projection fibers•Connect cerebrum with lower areas14-9 The Cerebrum•Association Fibers–Arcuate fibers •Are short fibers•Connect one gyrus to another–Longitudinal fasciculi •Are longer bundles•Connect frontal lobe to other lobes in same hemisphere14-9 The Cerebrum•Commissural Fibers–Corpus callosum –Anterior commissure14-9 The Cerebrum•Projection Fibers –Pass through diencephalon–Link cerebral cortex with:•Diencephalon, brain stem, cerebellum, and spinal cord–Internal capsule•All ascending and descending projection fibersFigure 14-13a Fibers of the White Matter of the CerebrumArcuate fibersLongitudinalfasciculiLateral viewFigure 14-13b Fibers of the White Matter of the CerebrumLongitudinalfissureCorpuscallosumProjectionfibers ofinternalcapsuleAnteriorcommissureAnterior view14-9 The Cerebrum•The Basal Nuclei–Are masses of gray matter–Are embedded in white matter of cerebrum–Direct subconscious activities 14-9 The Cerebrum•Anatomy of Basal Nuclei–Caudate nucleus•Curving, slender tail–Lentiform nucleus•Globus pallidus •PutamenFigure 14-14a...
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This note was uploaded on 12/29/2011 for the course BIOLOGY 24011 taught by Professor Pan during the Fall '11 term at HCCS.

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Chapt14 part2 - 14-9 The Cerebrum•The Cerebrum–Is the...

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