[{“id”,”question”:”FORMACIÓN RETICULAR”,”answer”:”1. Mediana\n2. Magnocelular\gnocelular\n4. Parvicelular\n”,”position” FORMACIÓN RETICULAR Organización General La formación reticular consiste en una red continua de células y fibras nerviosas asentada en zonasprofu. ¿Dónde se encuentra la formación reticular? a) Centro del Tronco encefálico b) Corteza cerebral c) Medula espinal d) Lóbulo temporal 2. La formación reticular.

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Trigeminal motor nucleus Facial motor nucleus GSE: Sagittal division reveals more morphological distinctions. The hypothalamic projection involves noradrenergic neurons of the locus coeruleus LC and serotoninergic neurons of the dorsal and median raphe nuclei DRwhich pass through the lateral hypothalamus and reach axons of the histaminergic tubero-mamillary nucleus TMNtogether forming a pathway extending into the forebrain, cortex and hippocampus.

The reticular formation is not anatomically well defined because it includes neurons located in diverse parts of the brain. Given the importance of the Reticilar for modulating cortical changes, disorders of the ARAS should result in alterations of sleep-wake cycles and disturbances in arousal. This was based upon the observation that the lesioning of the rostral reticular formation induces a hypersomnia in the gormacion brain.

Formatio reticularis labeled at left. Trapezoid body Trigeminal lemniscus Dorsal trigeminal tract Ventral trigeminal tract Medial lemniscus Lateral ofrmacion Medial longitudinal fasciculus Vestibulo-oculomotor fibers Anterior trigeminothalamic tract Central tegmental tract.

Archived from the original on 4 May Magoun used this principle to demonstrate, on two separate areas of the brainstem of a cat, how to produce wakefulness from sleep. The neurotransmitters that these neurons release include dopaminenorepinephrineserotoninhistamineacetylcholineand glutamate.

The ARAS also helps mediate transitions from relaxed wakefulness to periods of high attention. Dorsal raphe nucleus Median raphe nucleus. Pyramid Anterior median fissure Anterolateral sulcus Olive Inferior olivary nucleus. Sensory Sensory decussation Medial lemniscus Juxtarestiform body Ascending dorsal longitudinal fasciculus Medial longitudinal fasciculus Motor Descending dorsal longitudinal fasciculus Medial longitudinal fasciculus.


Anatomical studies have shown two main pathways involved in arousal and originating from the areas with cholinergic cell groups, one through the thalamus and the other, traveling ventrally through the hypothalamus and preoptic area, and reciprocally connected with the limbic system Nauta and Kuypers ; Siegel As counted in the cholinergic connections to the thalamic reticular nucleus The regulation of sleep and wakefulness involves many regions and cellular subtypes in the brain.

This chaotic, loose, and intricate form of organization is what has turned off many researchers from looking farther into this particular area of the brain. Surface Cerebellopontine angle Superior medullary velum Sulcus limitans Medial eminence Facial colliculus.

Formación Reticular by Daniella Riveros Arteaga on Prezi

Posterior median sulcus Posterolateral sulcus Area postrema Vagal trigone Hypoglossal trigone Medial eminence Inferior cerebellar peduncle. Physiologists had proposed that some structure deep fofmacion the brain controlled mental wakefulness and alertness. In order that the brain may sleep, there must be a reduction in ascending afferent activity reaching the cortex by suppression of the ARAS.

Cats with mesancephalic interruptions to the ARAS entered into a deep sleep and displayed corresponding brain waves.

Inferior cerebellar peduncle Vestibulocerebellar tract Medial longitudinal fasciculus Vestibulospinal tract Medial vestibulospinal tract Lateral vestibulospinal tract.

Reticular formation

Parabrachial and pedunculopontine glutamatergic arousal system Retrograde tracers from the BF have consistently identified one brainstem site of input that is not part of the classical monoaminergic ascending arousal system: The ascending reticular activating system is an important enabling factor for the state of consciousness.

Because these external stimuli would be blocked by the interruptions, this indicated that the ascending transmission must travel through the newly formacipn ARAS.

Interneuron Alpha motor neuron Onuf’s nucleus Gamma motor neuron.

Journal of Chemical Neuroanatomy. Current Opinion in Neurobiology. More recently, the medullary parafacial rehicular PZ adjacent to the facial nerve was identified as a sleep-promoting center on the basis of anatomical, electrophysiological and chemo- and optogenetic studies. International Journal of Molecular Sciences.


The thalamic pathway consists primarily of cholinergic neurons in the pontine tegmentumwhereas the hypothalamic pathway is composed primarily of neurons that release monoamine neurotransmittersnamely dopamine, norepinephrine, serotonin, and histamine. The direct electrical stimulation of the brain could simulate electrocortical relays. Formatio formackon grisea and formatio reticularis alba labeled at left.

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Views Read Edit View history. The ascending reticular activating system ARAS is responsible for a sustained wakefulness state. Apneustic center Pneumotaxic center Parabrachial nuclei Subparabrachial nucleus Medial parabrachial nucleus Lateral parabrachial nucleus Superior olivary nucleus Locus coeruleus.

Neurons of the reticular formation, particularly those of the ascending reticular activating system, play a crucial role in maintaining behavioral arousal and consciousness. Ventral Anterior median fissure Anterolateral sulcus Dorsal Posterior median sulcus Posterolateral sulcus. The original functional differentiation was a division of caudal and rostral. Cerebellopontine angle Superior medullary velum Sulcus limitans Medial eminence Facial colliculus. Eric Kandel describes the reticular formation as being organized in a similar manner to the intermediate gray matter of the spinal cord.

Retrieved 4 September Rexed laminae Central gelatinous substance Gray commissure. The ARAS consists of evolutionarily ancient areas of the brain, which are crucial to survival and protected during adverse periods.

This article uses anatomical terminology; for an overview, see anatomical terminology. The term reticulqr reticulum ” means “netlike structure”, which is what the reticular formation resembles at first glance. Existing on the sides of the medial reticular formation is its lateral cousin, which is particularly pronounced in the rostral medulla and caudal pons.