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9 Cards in this Set

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