MISC

1999年2月

External brain form and cranial nerves of the megamouth shark, Megachasma pelagios

COPEIA
  • H Ito
  • ,
  • M Yoshimoto
  • ,
  • H Somiya

1
開始ページ
210
終了ページ
213
記述言語
英語
掲載種別
出版者・発行元
AMER SOC ICHTHYOLOGISTS & HERPETOLOGISTS

The external brain form and cranial nerves of the megamouth shark, Megachasma pelagios, were studied morphologically, The brain of a mature female specimen, 5.44 m long and 1040 kg in weight, was examined. The brain is small, weighing 19.8 gm, and is positioned caudally in an extremely large cranial cavity, The length between the rostral end of the telencephalon and the caudal end of the medulla oblongata is 97 mm, The olfactory bulbs and the telencephalon are well developed, and the inferior lobe is rather small. The optic tectum is medium in size, The corpus cerebelli is proportionally small, whereas the auricle is large. The medulla oblongata is so widely everted that the visceral afferent, visceral efferent, and somatic efferent columns, as well as the sulci between them, are clearly visible in the rhomboid fossa. Terminal nerves were not found, The olfactory tracts and cranial nerves course for long distances within the expanded cranial cavity, Allometry of the brain size and the functional importance of the crainal nerves in this rare species are discussed in comparison with those of other cartilaginous fishes.

リンク情報
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000078650400027&DestApp=WOS_CPL
ID情報
  • ISSN : 0045-8511
  • eISSN : 1938-5110
  • Web of Science ID : WOS:000078650400027

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