BIOL 103 Lecture Notes - Thalamus, Vasodilation, White Matter

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The right hemisphere controls the left side of the body, discerns spatial relations and patterns and is involved in emotion and intuition. The two hemispheres communicate with each other constantly via the corpus callosum. The grey matter of the cerebral cortex does not extend throughout the interior of the brain. Much of the interior is white matter made up of large tracts or bundles or myelinated (sheathed) fibres that connect cell bodies in the cortex with those in the spinal cord and other centres lower in the brain. These centres are pockets of grey matter referred to as nuclei. The nuclei serve both as way stations connecting tracts from the cortex with other ascending and descending tracts and as integrating motor and sensory control centres. Some cortical cells project their long fibres or axons to motor neurons in the spinal cord but others project them only as far as these clusters of interconnecting neuron cell bodies.

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