Figure 1.

Myelo- and cytoarchitecture of the amygdaloid complex (AC), level 1 (Interaural 10.30 mm). Series of adjacent coronal sections stained for Gallyas (A), Nissl (B) and acetylcholinesterase (AChE) (C) and the corresponding drawing showing in black the territories of the AC and in orange the myelinic bundles schematically (D). At this level, it is already possible to identify the deep nuclei, and some of the superficial nuclei and myelin tracts located around and within the nuclei and helping in their delimitation. Unambiguous nuclear boundaries are drawn with a red dashed line in (B,C). (C) Note the intense staining of AChE in the Basal nucleus (B) and, although heterogeneous, in the accessory basal (AB); CeM showed a markedly high AChE staining level. Panels (E,F) are high magnification bright-field photomicrographs from Nissl-stained sections in the superficial areas of the AC [corresponding to the black squares in (B)]; the layers are indicated in each region. (E) The anterior cortical nucleus (ACo) contains a densely stained and cell-packed L2; the nucleus of the lateral olfactory tract (NLOT) shows a large L1. (F) PACo (inferior) and periamygdaloid cortex (PAC) 1 (superior). Note the different cell compaction of L2 between these two regions. Scale: 1 mm in (A–D) and 200 μm in (E,F).