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

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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 information
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14-9 The Cerebrum Gray Matter In cerebral cortex and basal nuclei White Matter Deep to basal cortex Around basal nuclei
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14-9 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 hemispheres
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14-9 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 lobe
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Figure 14-12a The Brain in Lateral View ateral sulcus Pons Medulla oblongata FRONTAL LOBE Central sulcus TEMPORAL LOBE Lateral view, cadaver brain Cerebellum OCCIPITAL LOBE PARIETAL LOBE
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Figure 14-12b The Brain in Lateral View FRONTAL LOBE Precentral gyrus Central sulcus Postcentral gyrus Lateral sulcus Pons PARIETAL LOBE OCCIPITAL LOBE TEMPORAL LOBE Cerebellum Medulla oblongata Lateral view
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Figure 14-12c The Brain in Lateral View Insula Retractors along the lateral sulcus showing the insula
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Figure 14-12d The Brain in Lateral View Central sulcus Postcentral gyrus PARIETAL LOBE OCCIPITAL LOBE Parieto- occipital sulcus Cerebellum Pons Medulla oblongata Midsagittal section TEMPORAL LOBE FRONTAL LOBE Precentral gyrus Cingulate gyrus
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14-9 The Cerebrum Three Functional Principles of the Cerebrum 1. Each cerebral hemisphere receives sensory information from, and sends motor commands to, the opposite side of the body 2. The two hemispheres have different functions, although their structures are alike 3. Correspondence between a specific function
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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 areas
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14-9 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 hemisphere
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14-9 The Cerebrum Commissural Fibers Corpus callosum Anterior commissure
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14-9 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 fibers
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Figure 14-13a Fibers of the White Matter of the Cerebrum Arcuate fibers Longitudinal fasciculi Lateral view
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Figure 14-13b Fibers of the White Matter of the Cerebrum Longitudinal fissure Corpus callosum Projection fibers of internal capsule Anterior commissure Anterior view
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14-9 The Cerebrum The
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