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Published byNeal Gibbs Modified over 9 years ago
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Gross Neuroanatomy
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CNS vs PNS
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Neuroanatomy CNS Nuclei (gray matter) vs. nerve tracts (white matter) Brain, functional areas Spinal cord Blood-brain barrier Ventricular system Blood supply PNS Cranial, cervical to sacral nerves, autonomic nerves muscles
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Methods Lesion studies Special stains (Golgi, Nissel) and histology
Tract tracing Surface-, Intracortical microstimulation PET, (f)MRI, EEG, MEG, TMS
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Phineas Gage--1848
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Neurons are signaling elements
Late nineteenth century: Golgi and Ramon y Cajal
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Mapping brain regions Wilder Penfield, 1940’s
Electrical stimulation of exposed human cortex during surgery
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Methods for functional studies
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Limbic lobe
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Cranial nerves
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Diencephalon and brainstem
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C-shaped structures
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Somatotopic mapping of human sensory and motor cortices
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CNS subdivision
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Brain: gray and white matter
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Diencephalon Thalamus major sensory center and motor output
Corpus callosum links 2 hemispheres Hypothalamus major center for homeostasis
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Thalamus All senses, except olfaction, are routed through it to cortex
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Limbic system emotion, memory, and learning
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Brainstem midbrain, pons, medulla
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Brainstem Tectum: Superior colliculus: part of vision
Inferior colliculus: part of audition Periaqueductal gray area Tegmentum: Reticular Formation: sleep, arousal, muscle tone contain norepinephrine nuclei Substantia Nigra: motor system (Parkinson’s dis) contain major dopamine nuclei Periaqueductal gray area: contain Substance P nuclei sensitive to opiates
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Spinal cord
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Blood-brain barrier endothelial cells (tight junctions in-between), pericytes, and astrocytes (end-foot processes)
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Motor corticospinal rubrospinal reticulospinal tracts
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Motor multiple descending tracts from brainstem
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Spinal Cord spinal reflex; central pattern generators at C-, L-enlargement
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Motor the motor unit
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Motor extrapyramidal system (basal ganglion)
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Functions of Basal ganglion: other than motor control
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Sensory Dermatomes
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Somatosensory spinothalamic tract
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Somatosensory proprioception dorsal column pathway
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Somatosensory pain modulatory pathways
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Autonomic
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Autonomic Hypothalamic nucleus
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