Abbreviation

AHA

Species

Rat

Description of part

In the rat the amygdalo-hippocampal area (figs. 9-12) forms a thin plate-like structure which is continuous medially and caudally with the ventral tip of the hippocampal formation. It appears immediately caudal to the main body of the medial nucleus and ventral to the posterodorsal part of this nucleus. It is separated from the latter by a prominent band of fibers which appear to arise in amygdalo-hippocampal area and ascend into the stria terminalis. On its lateral aspect it merges with the basomedial nucleus rostrally and with the ventral part of the lateral entorhinal area caudally. In both the cat and the rat the amygdalo-hippocampal area is readily distinguished from the adjacent amygdaloid structures by its larger, more deeply-staining and tightly-packed cells. Caudally, however, its structure is similar to that of the hippocampal formation, with which it is directly continuous, and a separation is not readily made. The term “amygdalo-hippocampal area” (cf. Berman and Jones, 1977) has been used for this structure in the present account because, although it is distinct and should not be considered a transitional area, it is continuous both with the amygdala and with the subiculum and it appears to have connections which are similar in certain respects to both structures (Krettek and Price, 1978). It corresponds to the posteromedial basal nucleus "(B3)’’ described by Scalia and Winans (1975) in the rat, rabbit and opossum and to the most caudal part of the medial nucleus described by Brodal (1947) in the rat.

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