Fig. 5.

Photomicrographs of transverse sections through the telencephalon of actinopterygian fishes to show some general features of this brainpart, including the location of the attachment of the tela choroidea (i.e. the taenia), the depth of the sulcus externus, and the position of the lateral olfactory tract. a The shovelnose sturgeon Scaphirhynchus platorynchus; b the paddlefish Polyodon spathula; c the bowfin Amia calva; d the trout Salmo gairdneri; e, f the zebrafish Danio rerio; g the eel Anguilla anguilla; h the elephant fish Mormyrus cashive; j the marine catfish Arius spec.; k the swamp eel Synbranchus marmoratus. The staining techniques used are as follows: a, c, e, f Nissl; b haematoxylin and eosin; d, g Bodian; h–k Weigert-Pal-paracarmine. The dotted line in e indicates the delineation of cell mass Dp as presented by Mueller and Wullimann (2009) in their Fig. 4c. Bar scales 250 μm