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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)119-126
Number of pages8
JournalJournal of Anatomy
Volume194
Issue number1
DOIs
Publication statusPublished - 1999 Jan
Externally publishedYes

Keywords

  • Cranial osteology
  • Eye
  • Orbit
  • Skull

ASJC Scopus subject areas

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

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