304 Brain Struct Funct (2011) 216:301–317 Fig. 2 Nissl-stained CA1 pyramidal cell layer. Unless noted other- wise, images were taken at mid-proximodistal and mid-septotemporal locations. a Human, slight differences between superﬁcial and deep CA1 can be seen in both cell density and staining characteristics of the pyramidal cells, b Marmoset monkey, c large-eared slit-faced bat, d little free-tailed bat, e Wahlberg’s epauletted fruit bat, f Parma wallaby, g common brush-tailed possum, h fox, i common mole rat, j eastern rock elephant shrew, k long-tailed chinchilla, l–n Wistar rat, l septal, m septal extreme and n temporal CA1, o–p C57BL/6 mouse, o septal and p temporal CA1. Scalebars a–l 50 lm, m–p 25 lm 123