Reticular formation, Cerebellum, Spinal Cord

Reticular formation, Cerebellum, Spinal Cord - and...

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Reticular formation: A network consisting of nuclei and interlacing nerve fibers in medullar, pons, and midbrain (and some in diencephalon) Projected into thalamus and cerebral cortex Reticular activating system (RAS) responsible for arousal, wakefulness, and consciousness; if damaged, coma depressed by alcohol Cerebellum: One-eighth by weight (largest after cerebral cortex) Separated from the cerebral hemispheres by a strong membrane and connected to the midbrain, pons, and medulla via peduncles Coordinates subconscious movements of skeletal muscles, directs precise, smooth movements
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Unformatted text preview: and maintains equilibrium Spinal Cord: • Higher brain to periphery • A cylindrical structure, a continuation of medulla oblongata, inferior part of the brain stem (42-45 cm in length; 2.5 cm circumference) • Contains major ascending (5) and descending (2) tracts • Conducts sensory and motor impulses between the periphery and the brain • Integrates reflexes • Divided into 5 divisions; 31 pairs of spinal nerves; cervical, thoracic, lumbar, sacral, coccygeal...
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