Fig. 1
From: A transcriptomic reevaluation of the accessory olfactory organ in Bichir (Polypterus senegalus)
Structure of the olfactory organ of bichir (Polypterus senegalus). (A) Lateral view of the head tip of bichir. The olfactory organ is located in the dotted circle between the eye and the anterior nasal tube. (B) The olfactory organ and part of the brain removed from the head. The left and right olfactory organs are composed of two structures: the MOO and AOO, respectively. The caudal posterior end of the MOO is connected to the olfactory bulb. (C) Overall view of a HE-stained horizontal section of the olfactory organ. The lamellae of olfactory organs were stained blue–violet, and the nerve bundles (NB) and cartilage were stained red–violet. Higher magnification views of the thickened (D, F) and thinner (E, G) epithelium lining the AOO and MOO lamellae, showing sensory and nonsensory epithelium, respectively. Scale bars indicate 3 mm (A, B), 1mm (C), or 50 μm (D-G). d: dorsal, r: rostral, c: caudal