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Chem. Senses 25: 387-393, 2000
© Oxford University Press 2000

Projection Pattern of Vomeronasal Neurons to the Accessory Olfactory Bulb in Goats

Shu Takigami1,2, Yuji Mori2 and Masumi Ichikawa1,3

1 Department of Anatomy and Embryology, Tokyo Metropolitan Institute for Neuroscience, 2-6 Musashidai, Fuchu, Tokyo 183-8526, 2 Laboratory of Veterinary Ethology, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, and 3 CREST of Japan Science and Technology Corporation, Kawaguchi 332-0012, Japan

Correspondence to be sent to: Masumi Ichikawa, Department of Anatomy and Embryology, Tokyo Metropolitan Institute for Neuroscience, 2-6 Musashidai, Fuchu, Tokyo 183-8526, Japan. e-mail: mich{at}tmin.ac.jp

Goats have a well-developed vomeronasal (VN) system and exhibit pheromone-induced reproductive facilitation, but there are no reports on the projection pattern of VN neurons in this species. Rodent, guinea pig and opossum accessory olfactory bulbs (AOBs) have been shown to have a segregated pattern of projection of the VN neurons, which express the two {alpha}-subtypes of the G-protein, namely Gi2 and Go, to the rostral and caudal regions of the AOB, respectively. In this study we investigated the projection pattern of VN nerve terminals by immunocytochemical staining of the goat vomeronasal organ (VNO) and the AOB with antibodies to Gi2 and Go. Gi2-immunoreactivity was found on the luminal surface of the sensory epithelium of the VNO, and in the VN nerve and glomerular layer throughout the AOB. On the other hand, Go-immunoreactivity was not identified in either the VNO or the VN nerve layer of the AOB. These results indicate that the projection pattern of VN neurons from the VNO to the AOB in the goat is considerably different from that in rodents which show a distinct segregated pattern.


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