Abbreviation

MRNp

Species

Rat

Description of part

Rye et al. (1987) have distinguished a caudal, small-celled part of the central tegmental field, which they refer to as the midbrain extrapyramidal area. We refer to this cell group as the parvicellular part of the midbrain reticular nucleus, and by extension refer to the rest of the nucleus as the magnocellular part. Typically, cells in the MEAp are also smaller than those in the PRNr. Previous to the work of Rye et al. (1987) we included the MRNp within the pedunculopontine nucleus. Thus, projections we reported to the pedunculopontine nucleus from the substantia innominata or ventral pallidal region (Swanson et al. 1984) and medial preoptic area (Swanson et al. 1987) were actually to the MRNp, which Rye et al. (1988) suggest may correspond to the midbrain locomotor region.

Part type

gray matter

Nomenclature

Swanson-2004

Endorsement

The approach used by the collator Mihail Bota is not endorsed by the author of the nomenclature.

Reference