Reticular Activating System
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| What are the three groups of reticular nuclei? | Precerebellar, central, and lateral. | |
| What are the nuclei in the precerebellar group? | Lateral reticular nuclei, paramedian reticular nuclei, and teticulotegmental. | |
| What is the function of the precerebellar nuclei? | To project and receive input from the cerebellum, translate states/alertness /consciousness to the cerebellum. | |
| What are the nuclei in the central group? | Raphe nuclei, locus cereleus, ventral reticular nucleus, gigantocellular reticular nucleus, and pontine reticular nucleus. | |
| What is locus cereleus associated with? | Sleep and wake cycles. | |
| What are the ventral reticular nucleus, gigantocellular reticular nucleus, and pontine reticular nucleus associated with? | The descending reticulospinal pathways. | |
| What are the nuclei in the lateral group? | Parivicellular, cuneiform, subcuneiform, and pedunculopontine. | |
| What are the parivicellular, cuneiform, subcuneiform, and pedunculopontine associated with? | Visceral functions of the reticular formation. | |
| Describe the ascending reticular activating system. | Fibers of the reticular formation that project to the hypothalamus and thalamus. | |
| Where are the fibers of the ascending reticular activating system found? | Not in specific tracts, but in the pons, midbrain, and diencephalons. | |
| Afferents to the ascending reticular activating system are from where? | Spinoreticular tract, cranial nerve nuclei, tectoreticular tract, and the association cortex of the parietal lobe. | |
| What are the two types of fibers used by the ascending reticular activating system? | Type I and type II. | |
| Describe type I fibers. | Large, rapid conductor, can only excite the cerebral cortex for a few milliseconds. | |
| Describe type II fibers. | Small, slow conduction, longer term, background excitability. | |
| What are the two pathways of the Reticulospinal tract? | The medullary reticulospinal tract and the pontine reticulospinal tract. | |
| The medullary reticulospinal tract and the pontine reticulospinal tract are part of what? | The descending reticular activation system. |
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