The spinal trigeminal nucleus sends pain-temperature information to the thalamus and sends information to the mesencephalon and the reticular formation of the brainstem.
32.
The posterior lobe receives input mainly from the brainstem ( i . e ., reticular formation and inferior olivary nucleus ) and cerebral cortex.
33.
An important component of the system is the reticular formation, a group of neuron-clusters scattered diffusely through the core of the lower brain.
34.
For example, cells in the main trigeminal nucleus ( Main V in the diagram below ) receive input from the reticular formation and cerebral cortex.
35.
The medial reticular formation and lateral reticular formation are two columns of neuronal nuclei with ill-defined boundaries that send projections through the afferent nerves.
36.
The medial reticular formation and lateral reticular formation are two columns of neuronal nuclei with ill-defined boundaries that send projections through the afferent nerves.
37.
The descending afferent connections come mostly from the frontal and parietal lobes; however the pontine reticular formation also sends projections to the paramedian reticular nucleus.
38.
Hyperextension occurs due to facilitation of the anterior reticulospinal tract caused by the inactivation of inhibitory corticoreticular fibers, which normally act upon the pons reticular formation.
39.
The modulatory functions are primarily found in the rostral sector of the reticular formation and the premotor functions are localized in the neurons in more caudal regions.
40.
In their experiments, Moruzzi and Magoun also transected the cat's reticular formation without disrupting any of the sensory nerves; the cat was rendered comatose.
