| 著者 |
Daisuke Kondoh
| en |
Daisuke Kondoh
Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido,
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Wataru Tonomori
| en |
Wataru Tonomori
Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido,
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Department of Geology and Paleontology, National Museum of Nature and Science, Tsukuba, Ibaraki,
Ashoro Museum of Paleontology, Ashoro, Hokkaido, Japan.
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Ryota Iwasaki
| en |
Ryota Iwasaki
Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido,
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Jumpei Tomiyasu
| en |
Jumpei Tomiyasu
Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido,
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Yuka Kaneoya
| en |
Yuka Kaneoya
Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido,
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Yusuke K. Kawai
| en |
Yusuke K. Kawai
Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido,
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Shun Ikuta
| en |
Shun Ikuta
Incorporated Non‑Profit Organization, Marine Wildlife Center of Japan, Abashiri, Hokkaido, Japan.
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Hayao Kobayashi
| en |
Hayao Kobayashi
Faculty of Bioindustry, Tokyo University of Agriculture, Abashiri, Hokkaido, Japan.
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Mari Kobayashi
| en |
Mari Kobayashi
Incorporated Non‑Profit Organization, Marine Wildlife Center of Japan, Abashiri, Hokkaido, Japan.
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Faculty of Bioindustry, Tokyo University of Agriculture, Abashiri, Hokkaido, Japan.
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内容記述 |
Most terrestrial mammals have a vomeronasal system to detect specific chemicals. The peripheral organ of this system is a vomeronasal organ (VNO) opening to the incisive duct, and its primary integrative center is an accessory olfactory bulb (AOB). The VNO in seals is thought to be degenerated like whales and manatees, unlike otariids, because of the absence of the AOB. However, olfaction plays pivotal roles in seals, and thus we conducted a detailed morphological evaluation of the vomeronasal system of three harbor seals (Phoca vitulina). The VNO lumen was not found, and the incisive duct did not open into the oral cavity but was recognized as a fossa on the anteroventral side of the nasal cavity. This fossa is rich in mucous glands that secrete acidic mucopolysaccharides, which might originate from the vomeronasal glands. The olfactory bulb consisted only of a main olfactory bulb that received projections from the olfactory mucosa, but an AOB region was not evident. These findings clarified that harbor seals do not have a VNO to detect some chemicals, but the corresponding region is a specialized secretory organ. |
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