Proceedings of the Royal Society of London. Series B: Biological Sciences
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The ‘goatee’ of goatfish: innervation of taste buds in the barbels and their representation in the brain

Sadao Kiyohara

Sadao Kiyohara

Department of Chemistry and Bioscience, Faculty of Science, Kagoshima University, Kagoshima 890–0065, Japan

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,
Yoko Sakata

Yoko Sakata

Department of Chemistry and Bioscience, Faculty of Science, Kagoshima University, Kagoshima 890–0065, Japan

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,
Takuji Yoshitomi

Takuji Yoshitomi

Department of Chemistry and Bioscience, Faculty of Science, Kagoshima University, Kagoshima 890–0065, Japan

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and
Junzo Tsukahara

Junzo Tsukahara

Department of Chemistry and Bioscience, Faculty of Science, Kagoshima University, Kagoshima 890–0065, Japan

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Published:https://doi.org/10.1098/rspb.2002.2086

    Goatfish use a pair of large chin barbels to probe the sea bottom to detect buried prey. The barbels are studded with taste buds but little else is known about the neural organization of this system. We found that the taste buds of the barbel are innervated in a strict orthogonal fashion. The barbel is innervated by a main nerve trunk running in the core of the barbel. A longitudinal nerve bundle originates from the main trunk and, after running a short distance distally, divides into two circumferential nerve bundles (CNB) extending respectively, medially and laterally around the barbel. Approximately 15 CNBs innervate each 1 mm length of barbel. At each transverse level, the CNB innervates two clusters of taste buds, each containing 14 end–organs. The primary taste centre in the brain is similarly extraordinary. The sensory inputs from the barbel terminate in a derived dorsal facial lobe, which has a highly convoluted surface forming a multitude of tubercles. Electrophysiological mapping experiments show that the entire barbel is somatotopically represented in a recurved elongate tubular fashion within the dorsal facial lobe.