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Evolutionary Developments
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Considerable overlap between men & women
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Gray Matter: Neuronal Cell Bodies
White Matter: Axons, Myelin Figure 3.9a Horizontal section through the cerebral hemispheres at the level indicated at upper right. White matter is composed of myelinated axons, and gray matter is composed primarily of neurons. This diagram shows that the gray matter on the surface of the cerebral hemispheres forms a continuous sheet that is heavily folded.
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Figure 3.9b High-resolution structural MRI in a similar plane of section in a living human. This T2 image was obtained on a 4-tesla scanner (a high-magnetic-field scanner) using a 512 by 512 matrix for acquisition. Note that on T2 images the white matter appears darker than the gray matter. The skull and scalp can be seen here but are not shown in (a).
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Corpus Callosum Bundle of fibers connecting the two hemispheres
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Agenesis of Corpus Callosum
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Ventricles Page 72 Ventricles of the human brain. (a) Midsagittal view. (b) Three-dimensional view.
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Ventricles
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Ventricles in Zika-infected Babies
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Frames of Reference
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Figure 3.8b Lateral view of the left hemisphere (a) and dorsal view of the cerebral cortex (b) in humans. The major features of the cortex include the four cortical lobes and various key gyri. Gyri are separated by sulci and result from the folding of the cerebral cortex that occurs during development of the nervous system, to achieve an economy of size.
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Figure 2.16 Midline and Basal Structures of the Brain (Part 2)
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Sections Coronal Saggittal: Axial:
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Figure 2.15 Inside the Brain
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Meninges
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Cells of the Brain
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GLIA Figure Various types of glial cells in the mammalian central and peripheral nervous systems. An astrocyte is shown with end feet attached to a blood vessel. Oligodendrocytes and Schwann cells produce myelin around the axons of neurons—oligodendrocytes in the central nervous system, and Schwann cells in the peripheral nervous system. A microglial cell is also shown.
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Figure 2.5 Glial Cells (Part 2)
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Figure 2.5 Glial Cells (Part 1)
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NEURON Figure Mammalian neuron showing the cell body (soma) in the center surrounded by dendrites. The axon is visible as a hair-thin line emerging from the lower right quadrant of the soma and trailing off to the right of the image. This image shows a neuron expressing transferrin (TfR) receptor, a dendritic protein, tagged with green fluorescent protein (GFP) (green); TfR was produced in the cell body and transported to the dendrites. The red stain is anti-TfR, which distinguishes another source of TfR. Staining for MAP2, a dendrite-specific cytoskeletal protein, is blue. Though similar to the idealized neuron in Figure 2.2, this neuron has a relatively large dendritic field compared to its soma.
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Figure 2.1 The Major Parts of the Neuron
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Figure 2.3 Neurons Are Classified into Three Principle Types
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Structure of the Neuron
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Figure 3.8b Lateral view of the left hemisphere (a) and dorsal view of the cerebral cortex (b) in humans. The major features of the cortex include the four cortical lobes and various key gyri. Gyri are separated by sulci and result from the folding of the cerebral cortex that occurs during development of the nervous system, to achieve an economy of size.
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Figure 3.8a Lateral view of the left hemisphere (a) and dorsal view of the cerebral cortex (b) in humans. The major features of the cortex include the four cortical lobes and various key gyri. Gyri are separated by sulci and result from the folding of the cerebral cortex that occurs during development of the nervous system, to achieve an economy of size.
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1. Landmarks
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Neo=Red; Meso=Blue; Allo=Green
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Neocortex has 6 layers
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Allo has 3; Meso has 3-6
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3. Brodmann’s Areas Cytoarchitecture
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Maps boundary between different functions
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Functions of Cortex
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Figure Primary sensory and motor cortex and surrounding association cortex. The blue regions show the primary cortical receiving areas of the ascending sensory pathways and the primary output region to the spinal cord. The secondary sensory and motor areas are colored red. The remainder is considered association cortex.
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Frontal Lobe Functional Anatomy
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Parietal Lobe Functional Anatomy
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Dorsal “Where” Pathway
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Occipital Lobe Functional Anatomy
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Primary Visual Cortex: Conscious Seeing
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Blindsight
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Temporal Lobe
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Ventral “What” Pathway
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Subcortical Structures
Limbic System Basal Ganglion Diencephalon
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Figure 2.14 Two Important Brain Systems
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The Limbic System
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The Diencephalon
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Figure 2.16 Midline and Basal Structures of the Brain (Part 1)
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