Abbreviation

PAC

Species

Rat

Description of part

In the rat (figs. 7-11) the periamygdaloid cortex occupies a position similar to that in the cat. Although layer II in this animal is not broken up into clusters of cells the area is readily distinguished from the anterior cortical nucleus by the larger, more tightly-packed cells of layer II. As in the cat, layers II and III are thinner than in the posterior prepiriform area. Caudally, the periamygdaloid cortex becomes fused with the lateral aspect of the posterior cortical nucleus just medial to the incipient amygdaloid fissure (figs. 10, 11), but the two structures may be distinguished by the more tightly-packed and darkly-staining cells of the periamygdaloid cortex and the apparent absence of lamination of the smaller, paler cells of the posterior cortical nucleus. The term “periamygdaloid cortex” is used here to emphasize essentially cortical rather than nuclear structure of this cytoarchitectonic area. The term is derived from the work of M. Rose, who used it to describe several areas on the ventral surface of the hemisphere, including the anterior and posterior cortical nuclei and the medial nucleus, as well as the present periamygdaloid cortex, in a variety of mammals (Rose, 1926 [dog], 1929 [mouse], 1931 [rabbit]). Since that time it has been used loosely for the cortex overlying the amygdala, particularly the posterior prepiriform area; interestingly, Rose did not include this last area within his “area periamygdalaris".

Part type

gray matter

Nomenclature

Krettek & Price

Endorsement

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

Reference