Structures that develop to grow ventral or lateral outside this primitive tube as add-ons ( e . g ., the crus cerebri in the anterior of the midbrain ) are not considered part of the " tegmentum ", as they are not part of the primitive neural tube but grow as projections from the cerebral cortex.
42.
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.
