The 9 other cell populations belonged to the lateral group and extended from the posterior mesencephalic tegmentum to the caudal rhombencephalon [ formatio reticularis mesencephali, nucleus ventrolateralis tegmenti, ectopic area (Ec) of the nucleus isthmo-opticus (NIO), nucleus subceruleus, nucleus ceruleus, nucleus reticularis pontis caudalis, Nucleus vestibularis medialis, nucleus reticularis parvocellularis and nucleus reticularis magnocellularis]. 
This area contains the nucleus propositus hypoglossi as well as some vestibular nuclei: the Nucleus vestibularis medialis, the nucleus vestibularis lateralis, and the nucleus vestibularis spinalis.
Making use of the spike of PPU of Nucleus vestibularis medialis (NVM) as an indicator, the SN-STA had a latency of 33.28 +/- 3.1 ms.
Only a few labelled neurons were seen in the contralateral nucleus vestibularis superior, the ipsilateral cell group A, and the ipsilateral Nucleus vestibularis medialis..
Lobus parolfactorius and Nucleus vestibularis medialis were labelled by only MAb 270, whereas only MAb 35 labelled nucleus laminaris and the medial and lateral pontine nuclei.
The nucleus vestibularis magnocellularis projects bilaterally, the Nucleus vestibularis medialis projects ipsilaterally spinalward.
Projections were revealed from some hypothalamic nuclei, centrum medianum, as well as from nucleus parafascicularis and subthalamic nucleus; from zone incerta, field of Forel, nucleus medialis habenulae; from reticular formation of the pons, medulla oblongata and midbrain, central gray matter, colliculus superior, nucleus interstitialis Cajal; from contralateral red nucleus, nucleus fastigii and facial nucleus; from nucleus vestibularis lateralis (pars dorsalis) and Nucleus vestibularis medialis as well as from ventral horn of the spinal cord cervical segments.
The Nucleus vestibularis medialis receives a very weak projection.
substantia nigra pars lateralis, interpeduncular nucleus, inferior colliculus, nucleus cuneiformis, dorsal tegmental nucleus of Gudden, nucleus laterodorsalis tegmenti, Nucleus vestibularis medialis, nucleus vestibularis inferioris, in the fasciculus longitudinalis medialis and nucleus parvocellularis compacta.
GABA-T-intensive neurons were found to be rich in the following hindbrain structures: inferior colliculus, nuclei of the raphe system, nuclei parabrachialis dorsalis and ventralis, nucleus cuneiformis, Nucleus vestibularis medialis, nucleus tractus spinalis nervi trigemini, nucleus vagus, nucleus cochlearis, nucleus reticularis lateralis, nucleus ambiguus, nucleus cuneatus lateralis, inferior olive, and reticular formation of the pons and medulla.
The Nucleus vestibularis medialis, nucleus vestibularis lateralis and nucleus cochlearis dorsalis exhibit activity of high order, which indicates that the auditory system in the animal is quite active.
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