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Bones in the heart skeleton of the otter (Lutra lutra)

Published online by Cambridge University Press:  01 April 2000

MONIKA EGERBACHER ,
HEIKE WEBER  and
SILKE HAUER
MONIKA EGERBACHER
Affiliation:
Institute of Histology and Embryology, University of Veterinary Medicine, Vienna, Austria
HEIKE WEBER
Affiliation:
Department of Zoology, School of Veterinary Medicine, Hannover, Germany
SILKE HAUER
Affiliation:
Institute of Zoology, Martin Luther University Halle/Saale, Germany
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Abstract

In most mammalian species the cardiac skeleton is composed of coarse collagen fibres, fibrocartilage, and pieces of hyaline cartilage. Bone, the os cordis, is a regular constituent of the ruminant heart. The cardiac skeleton of the otter (Lutra lutra) has not previously been described. The skeleton in 30 otter hearts was studied by x-ray analysis and light microscopy. Serial sections were cut parallel to the atrioventricular plane and histochemical staining methods were performed to identify connective tissue fibres, glycosaminoglycans, mineral deposits, and bone. Age and sex of the animals under investigation were considered. The otter heart skeleton was composed of coarse collagen fibres with intercalated pieces of fibrous and/or hyaline cartilage, calcified cartilage, and lamellar bone with red or white marrow. Pieces of hyaline cartilage were not clearly defined: a perichondrial layer was missing and coarse connective tissue continuously transformed into fibrous and hyaline cartilage. In both sexes the amount of cartilage and bone were found to increase with age.

Our results establish the presence of bony material in the heart skeleton of the otter, a small mammalian species. This finding indicates that differentiation of bone is not exclusively related to the size of the organ. Increasing amounts of calcified cartilage and bone correlated with increasing age.

Keywords

Cardiac skeletonos cordiscartilageextracellular matrix
Type
Research Article
Information
The Journal of Anatomy , Volume 196 , Issue 3 , April 2000 , pp. 485 - 491
Copyright
© Anatomical Society of Great Britain and Ireland 2000

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