A search for a mesencephalic periaqueductal gray-cochlear nucleus connection.

M. Radmilovich, C. Bertolotto, J. L. Peña, M. Pedemonte, R. Velluti

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Horseradish peroxidase placed into the ventral mesencephalic periaqueductal gray (PAG) and in the lateral superior olivary complex region demonstrated indirect paths towards the cochlear nucleus (CN). Because no direct connections could be observed, a pathway throughout the auditory efferent system was proposed. The results suggest three possibilities: 1) The PAG is connected to the lateral superior peri-olivary complex synapsing with known efferent fibers that reach the CN; 2) Neurons located at the dorsal PAG were demonstrated to be connected to the inferior colliculus (IC). The possibility of synapses with known neurons that run from IC to the CN is postulated; 3) Neurons in the trapezoid body, which are partially associated with a system that communicates with the CN, are also connected to and from the PAG. The present results anatomically support an extracellular study (1) describing PAG actions on CN units.

Original languageEnglish (US)
Pages (from-to)369-375
Number of pages7
JournalActa physiologica, pharmacologica et therapeutica latinoamericana : órgano de la Asociación Latinoamericana de Ciencias Fisiológicas y [de] la Asociación Latinoamericana de Farmacología
Issue number4
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Physiology
  • Pharmacology


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