All of the EM analyses examined the dorsal portion of the LA, where thalamic afferents innervate LA neurons most densely (Quirk et al., 1996). Prior to ultrathin sectioning, the position of the dorsal LA within Vibratome sections was identified based on landmarks visualized by light microscopy, by using the external capsule as the lateral border and the diagonally coursing lateral association bundle to delineate the dorsal and medial borders (Rodrigues et al., 2004b) (Fig. 2).
