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9 Cards in this Set
- Front
- Back
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general functions of reticular formation
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*coordination of somatic and autonomic activity
*modification of sensory input *regulation of consciousness levels *posture, in the sense of muscle tone, as well as general levels of cortical activity |
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midline raphe nuclei
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more or less continuous column of serotonergic neurons located in the brain stem mid-line
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locus ceruleus
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contains noradrenergic neurons, pigmented blue spots at pontomesencephalic junction
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pedunculopontine nucleus
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cholinergic neurons located in the rostral pons extending into midbrain, associated with stereotypical motor patterns and levels of consciousness
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Horner's syndrome = interruption of the oculosympathetic pathway
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caused by lesion of descending autonomic fibers.
sxs=ipsilateral ptosis, miosis, and anhydrosis on affected side, dilitation lag, and enophthalamos (retraction of eyeball) |
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periaqueductal gray
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surrounds cerebral aqueduct of midbrain, contains neurons with opiate receptors
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ascending reticular activating system (ARAS)
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relays diffuse information that controls level of alertness and sleep-wake rhythms, shows tonic activity maintained by sensory stimuli
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sleep
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an active rhythmic neural process
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startle reflex, involves ARAS
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sudden noise, flash of light, pain, unexpected touch that results in increased heart rate and other autonomic responses including increased blood pressure and respiration
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