[{“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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Sagittal division reveals more morphological formacuon. The reticulospinal tracts works with the other three pathways to give a coordinated control of movement, including delicate manipulations. Spinoreticular tract Spino-olivary tract.

In alternative fashion, cats with similarly placed interruptions to ascending auditory and somatic pathways exhibited normal sleeping and wakefulness, and could be awakened with somatic stimuli.

Retrieved from ” https: They included glutamatergic, cholinergic, noradrenergic, dopaminergic, serotonergic, histaminergic, and orexinergic systems for review, see Lin reticulat al.

Superior salivary nucleus Inferior salivary nucleus. The original functional differentiation was a division of caudal and rostral.

The regulation of sleep and wakefulness involves many regions and cellular subtypes in the brain. The thalamic projection is dominated by cholinergic neurons originating from the pedunculopontine tegmental nucleus of pons and midbrain PPT and laterodorsal tegmental nucleus of pons and midbrain LDT nuclei retticular, 18].

The reticulospinal tracts are involved mainly in locomotion and postural control, although they do have other functions as well. Conversely, up-regulated electrical coupling would increase synchronization of fast rhythms that could lead to increased arousal and REM sleep drive. Fewer cholinergic neurons of the pons reticulxr midbrain send projections to the forebrain along the ventral pathway, bypassing the thalamus [19, 20].

In order that the brain may sleep, there must be a reduction in ascending afferent activity reaching the cortex by suppression of the ARAS. The History, Physical, and Laboratory Examinations. The Journal of Rteicular Neurology.


Sensory Posterior Posterior column-medial lemniscus pathway: The medial RF is large and has long ascending and descending fibers, and is surrounded by the lateral reticular formation. Inferior cerebellar peduncle Vestibulocerebellar tract Medial longitudinal fasciculus Vestibulospinal tract Medial vestibulospinal tract Lateral vestibulospinal tract.

There are several potential factors that may adversely influence the development of the ascending reticular activating system:. Archived from the original on These results suggest some relationship between ARAS circuits and physiological pain pathways. The ARAS is a part of the reticular formation and is mostly composed of various nuclei in the thalamus and a number of dopaminergicnoradrenergicserotonergichistaminergiccholinergicand glutamatergic brain nuclei. Given the importance of the ARAS for modulating cortical changes, disorders of the ARAS should result in alterations of sleep-wake cycles and disturbances in arousal.

The term ” reticulum ” means “netlike structure”, which is what the reticular formation resembles at first glance. This study has led to the idea that the caudal portion inhibits the rostral portion of the reticular formation. Interneuron Alpha motor neuron Onuf’s nucleus Gamma motor neuron. It was found in a recent study in the rat that the state of wakefulness is mostly maintained by the ascending glutamatergic projection from the parabrachial nucleus and precoeruleus regions to the basal forebrain and then relayed to the cerebral cortex Fuller et al.

Seminars in the Neurosciences.

Formación Reticular by Erick Jimar Chambi Machaca on Prezi

They are organized in a widely projecting manner, much formacino the monoamines Chapter 6and innervate all of the components of the ARAS. Excitation of the ARAS did not depend on further signal propagation through the cerebellar circuits, as the same results were obtained following decerebellation and decortication. Because these external stimuli would be blocked by the interruptions, this indicated that the ascending transmission must travel through the newly discovered ARAS.

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 formadion system Nauta and Kuypers ; Siegel The human reticular formation is composed of almost brain nuclei and contains many projections into the forebrainbrainstemand cerebellumamong other regions.


Eric Kandel describes the reticular formation as being organized in a similar manner to the intermediate gray matter of the spinal cord.

Surface Cerebellopontine angle Superior medullary velum Sulcus limitans Medial eminence Facial colliculus. The ascending reticular activating system ARAS is responsible for a sustained wakefulness state. Cortical arousal also takes advantage of dopaminergic neurons of the substantia nigra SNventral tegmenti area VTA and the periaqueductal grey area PAG. The raphe nuclei form a ridge in the middle of the reticular formation, and, directly to its periphery, there is a division called the medial reticular formation.

Formación reticular

The ARAS consists of evolutionarily ancient areas of the brain, which are crucial to survival and protected during adverse periods. Posterior median sulcus Posterolateral sulcus Area postrema Vagal trigone Hypoglossal trigone Medial eminence Inferior cerebellar peduncle.

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.

Orexin neurons are located in the lateral hypothalamus. Fundamental neuroscience 4th ed. As a result, the ARAS still functions during inhibitory periods of hypnosis.