Figure 10.

Morphology of the claustrum in the humpback whale (Megaptera novaeangliae). (A) Parasagittal section through one hemisphere of an adult humpback whale. There are a very large number of claustral islands dispersed in the white matter underlying the perisylvian, ectosylvian, and suparsylvian cortex, as well as in the frontal pole (arrows). (B) Higher magnification image of a large cluster of these claustral neurons in the white matter of the suprasylvian gyrus. (C) Shows cellular details. Note that as in the bottlenose dolphin, these claustral island are completely separate from the neocortex. Scale bars = 2 cm (A), 6 mm (B), and 1.5 mm (C).