Abbreviation

SI

Species

Mouse

Description of part

Following the carving out out of the ventral pallidum from the substantia innominata out of the ventral pallidum from the substantia innominata, the remainder (posterior part) was called the sublenticular part of the SI (Heimer et al., 1985). Paxinos and Watson (1986) noticed that a strip of substantia innominata persists rostrally bounded by the ventral pallidum, the lateral preoptic area, the nucleus of the horizontal limb of the diagonal band, and the magnocellular preoptic nucleus. They retained the term substantia innominata for this panhandle. It has been argued that the cells of this region, traditionally called substantia innominata, represent the rostral end of a continuous column of cells stretching from the amygdala in the temporal lobe to the forebrain (Alheid et al., 1995). Alheid et al. (1995) have named this region the sublenticular extended amygdala and divided it into two parts: a medial division (SLEAM) and a central division (SLEAC). In the mouse we have retained the more traditional delineation of the substantia innominata, but also show the proposed division into medial and central sublenticular extended amygdala (Figs. 34-39). The central division corresponds to the anterodorsal substantia innominata (De Olmos et al., 1985), or what Grove (1988a,b) termed the dorsal subdivision of the SI, which is lightly stained with AChE and Timm reaction. The medial division corresponds to Grove ventral division of the substantia innominata, or the posteroventral substantia innominata of De Olmos et a l . (1985), and it stains moderately for substance P, AChE, and Timm reaction.

Part type

gray matter

Nomenclature

Paxinos/Franklin-2001

Endorsement

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

Collator argument

The hierarchy of this region was constructed using the rat atlas Paxinos and Watson 1998, and Heimer et al. 1995.

Reference

substantia innominata - Rat - Paxinos/Watson-1998
substantia innominata - Human - Bowden-Human-2002
substantia innominata - Macaca fascicularis - Bowden-Macaca-2002
substantia innominata - Cat - Berman/Jones-1982
substantia innominata - Mouse - Hof et al.-2000