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This was based upon the observation that the lesioning of the rostral reticular formation induces a hypersomnia in the cat brain, while lesioning the caudal portion causes insomnia. This study has led to the idea that the caudal portion inhibits the rostral portion of the reticular formation. [citation needed]
The caudal pontine reticular nucleus or nucleus reticularis pontis caudalis is a portion of the reticular formation, composed of gigantocellular neurons. In rabbits and cats it is exclusively giant cells, however in humans there are normally sized cells as well. In rodents, it has been shown to play a role in the acoustic startle response.
The oral pontine reticular nucleus, or rostral pontine reticular nucleus is one of the two components of the medial (efferent/motor) zone of the pontine reticular formation - the other being the caudal pontine reticular nucleus.
The tract is situated in the central portion of the reticular formation. [1] Structure ... (the rostral part of the solitary nucleus] ...
In cats with pontine lesions, their normal atonia is not present, the dorsal raphe nucleus is fully active, as opposed to the cessation of action under normal conditions. A muscle relaxant, known as Mephenesin , reduces activity of the dorsal nucleus, as well as microinjections of carbachol (which induces atonia while awake).
The gigantocellular reticular nucleus (also magnocellular reticular nucleus) is the (efferent/motor) medial zone of the reticular formation of the caudal pons and rostral medulla oblongata. It consists of a substantial number of giant neurons, but also contains small and medium sized neurons. [1]
The tegmentum area includes various different structures, such as the rostral end of the reticular formation, several nuclei controlling eye movements, the periaqueductal gray matter, the red nucleus, the substantia nigra, and the ventral tegmental area. [3] The tegmentum is the location of several cranial nerve nuclei. The nuclei of CN III and ...
Thanks to the number of different nuclei located within the pontine tegmentum, it is a region associated with a range of functions including sensory and motor functions (due to the cranial nuclei and fiber tracts), control of stages of sleep and levels of arousal and vigilance (due to the ascending cholinergic systems), and some aspects of respiratory control.