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Encyclopedia > Pontine tegmentum

The pontine tegmentum is a part of the pons of the brain involved in the initiation of REM sleep. It includes the pedunculopontine nucleus and the laterodorsal tegmental nucleus, among others, and is located in close proximity to the raphe nucleus and the locus ceruleus. The pons is a knob on the brain stem. ... In the anatomy of animals, the brain, or encephalon, is the supervisory center of the nervous system. ... Rapid eye movement (REM) is the stage of sleep during which the most vivid (though not all) dreams occur. ... The pedunculopontine nucleus (PPN) is located in the brainstem, caudal to the substantia nigra and adjacent to the superior cerebellar peduncle. ... The raphe nucleus (Latin for the bit in a fold or seam) is a moderately sized cluster of neurons found in the brain stem, and releases serotonin to the rest of the brain. ... The Locus ceruleus, also spelled locus coeruleus, (Latin for the blue bit) is a nucleus in the brain stem (inferior to the cerebellum in the caudal midbrain/rostral pons) apparently responsible for the physiological reactions involved in stress and panic. ...


Animal studies have shown that lesions of the pontine tegmentum can greatly reduce or even eliminate REM sleep. Injection of a cholinergic agonist (e.g. carbachol), into the pontine tegmentum produces a state of REM sleep in cats. A synapse is cholinergic if it uses acetylcholine as its neurotransmitter. ... Agonists An agonist is a substance that binds to a receptor and triggers a response by the cell. ... Clinical Info Chemistry and pharmacokinetics Carbachol is a choline ester and a positively charged quaternary ammonium compound. ...


PET studies seem to indicate that there is a correlation between blood flow in the pontine tegmentum, REM sleep, and dreaming. Positron emission tomography (PET) is a nuclear medicine medical imaging technique which produces a three dimensional image or map of functional processes in the body. ... Dreaming is the subjective experience of imaginary images, sounds/voices, words, thoughts or sensations during sleep, usually involuntarily. ...


Pontine waves (P-waves, or ponto-geniculate-occipital waves) are brain waves generated in the pontine tegmentum. They can be observed in mammals, precede the onset of REM sleep, and continue throughout its course. After periods of memory training, P-wave density increases during subsequent sleep periods in rats. This may be an indication of a link between sleep and learning. Electroencephalography is the neurophysiologic exploration of the electrical activity of the brain by the application of electrodes to the scalp. ... A girl sleeping Sleep is the regular state of natural unconsciousness observed in all mammals and birds. ... Learned redirects here. ...


The trapezoid body is part of the pontine tegmentum. The trapezoid body is part of the acoustic pathway. ...


  Results from FactBites:
 
Pontine tegmentum - Psychology Wiki (341 words)
The pontine tegmentum is a part of the pons of the brain involved in the initiation of REM sleep.
PET studies seem to indicate that there is a correlation between blood flow in the pontine tegmentum, REM sleep, and dreaming.
Pontine waves (P-waves, or ponto-geniculate-occipital waves) are brain waves generated in the pontine tegmentum.
Urinary retention associated with a unilateral lesion in the dorsolateral tegmentum of the rostral pons -- KOMIYAMA et ... (1096 words)
Urinary retention associated with a unilateral lesion in the dorsolateral tegmentum of the rostral pons -- KOMIYAMA et al.
Urinary retention associated with a unilateral lesion in the dorsolateral tegmentum of the rostral pons
in the rostral portion of the pontine tegmentum.
  More results at FactBites »

 
 

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