CT examination of the head of the Baikal seal (Phoca sibirica)

Hideki Endo, Hiroyuki Sasaki, Yoshihiro Hayashi, Evageny A. Petrov, Masao Amano, Naoki Suzuki, Nobuyuki Miyazaki

研究成果: Article査読

9 被引用数 (Scopus)

抄録

We carried out a computerised tomographic (CT) examination to elucidate the modifications in the head related to orbital enlargement in the Baikal seal. Transverse CT images showed that (1) the external frontal contours and the frontal sinuses are compressed medially and ventrally by the orbital enlargement; (2) the caudal part of the nasal cavity and nasopharynx are compacted ventrally; and (3) the cranial cavity is displaced caudally. The neurocranium is obviously separated from the facial part in the transverse plane at the caudal legion of the orbit. The disposition of the mandible, zygomatic arch, temporal bone, and the masseter, temporal, digastric and pterygoid muscles is changed by the enlarged orbit in the 3-dimensional reorganisation of the head in this species. It is suggested that adaptation for the Lake Baikal environment primarily resulted in orbital enlargement, and that the altered orbital design may subsequently have influenced the form and function of the masticatory and respiratory system.

本文言語English
ページ(範囲)119-126
ページ数8
ジャーナルJournal of Anatomy
194
1
DOI
出版ステータスPublished - 1999 1
外部発表はい

ASJC Scopus subject areas

  • Anatomy
  • Ecology, Evolution, Behavior and Systematics
  • Histology
  • Molecular Biology
  • Developmental Biology
  • Cell Biology

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