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Figure 1

From: Comparative Brain Morphology of the Greenland and Pacific Sleeper Sharks and its Functional Implications

Figure 1

Brain images of a representative specimen of the (A,C) Greenland shark (Somniosus microcephalus) and the (B,D) Pacific sleeper shark (S. pacificus) in (A,B) dorsal and (C,D) lateral views. (A,B) show photomicrographs of one of two paired olfactory bulbs (OB) and the peduncle (olfactory tract), detached from the telencephalon (Tel) at the level anterior to the lateral pallium (dotted arrow), and the remaining brain (telencephalon (Tel), diencephalon (Di), optic tectum (OT), tegmentum (Tg), cerebellum (Cer), and medulla oblongata (Md)). For comparison, photomicrographs of the brain of the (E) silky shark Carcharhinus falciformis (Photo: T. Lisney) and (F) whale shark, Rhincodon typus (Photo: K. Yopak) in lateral view are presented. Olfactory bulbs not shown in (C–F). Scale bars correspond to 1 cm.

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