Comparative anatomy of the cardiac foramen ovale in the Pinnipedia
The structure of the cardiac foramen ovale from eight genera of pinnipeds was studied using the scanning electron microscope. Specimens were obtained from fetuses or neonates of the Californian sea lion (Zalophus californianus), Antarctic fur seal (Arctocephalus gazella), walrus (Obenus rosmarus), g...
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Canadian Science Publishing
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crcansciencepubl:10.1139/z95-100 2023-12-17T10:21:49+01:00 Comparative anatomy of the cardiac foramen ovale in the Pinnipedia Macdonald, Alastair A. Dixon, Christopher Boyd, Ian L. 1995 http://dx.doi.org/10.1139/z95-100 http://www.nrcresearchpress.com/doi/pdf/10.1139/z95-100 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 73, issue 5, page 850-857 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1995 crcansciencepubl https://doi.org/10.1139/z95-100 2023-11-19T13:38:18Z The structure of the cardiac foramen ovale from eight genera of pinnipeds was studied using the scanning electron microscope. Specimens were obtained from fetuses or neonates of the Californian sea lion (Zalophus californianus), Antarctic fur seal (Arctocephalus gazella), walrus (Obenus rosmarus), grey seal (Halichoerus gryphus), ringed seal (Phoca hispida), bearded seal (Erignathus barbatus), Weddell seal (Leptonychotes weddelli), and crabeater seal (Lobodon carcinophagus). In each species, the structure that permits oxygenated blood from the placenta flowing in the caudal vena cava to pass directly into the left side of the heart, the foramen ovale, when viewed from the terminal part of the caudal vena cava had the appearance of the entrance to a short tunnel. A thin fold of tissue, the developed remains of the septum primum, projected from the caudal edge of the foramen ovale into the lumen of the left atrium. It constituted about 75% of the inner surface of the tunnel, and was generally unfenestrated. The wall of the interatrial septum contributed the "floor." The distal end of the tunnel was straight-edged. In most cases the septum primum was long enough to cover the foramen ovale. The siting of pulmonary veins in the roof of the left atrium appeared to be such that drainage from them after birth would press the septum primum over the foramen opening, thereby functionally closing it. Collapses of the tunnel was seen in all the neonatal seals, and in the 1-month-old neonate the fold of tissue was anchored to the interatrial septum along the surface of the crista dividens, which lay in the left atrium. Cellular protrusions and thread formation may play a role in the closure of the foramen ovale. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella bearded seal Crabeater Seal Erignathus barbatus Leptonychotes weddelli Lobodon carcinophagus Phoca hispida ringed seal Weddell Seal walrus* Canadian Science Publishing (via Crossref) Antarctic Weddell Canadian Journal of Zoology 73 5 850 857 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Macdonald, Alastair A. Dixon, Christopher Boyd, Ian L. Comparative anatomy of the cardiac foramen ovale in the Pinnipedia |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
The structure of the cardiac foramen ovale from eight genera of pinnipeds was studied using the scanning electron microscope. Specimens were obtained from fetuses or neonates of the Californian sea lion (Zalophus californianus), Antarctic fur seal (Arctocephalus gazella), walrus (Obenus rosmarus), grey seal (Halichoerus gryphus), ringed seal (Phoca hispida), bearded seal (Erignathus barbatus), Weddell seal (Leptonychotes weddelli), and crabeater seal (Lobodon carcinophagus). In each species, the structure that permits oxygenated blood from the placenta flowing in the caudal vena cava to pass directly into the left side of the heart, the foramen ovale, when viewed from the terminal part of the caudal vena cava had the appearance of the entrance to a short tunnel. A thin fold of tissue, the developed remains of the septum primum, projected from the caudal edge of the foramen ovale into the lumen of the left atrium. It constituted about 75% of the inner surface of the tunnel, and was generally unfenestrated. The wall of the interatrial septum contributed the "floor." The distal end of the tunnel was straight-edged. In most cases the septum primum was long enough to cover the foramen ovale. The siting of pulmonary veins in the roof of the left atrium appeared to be such that drainage from them after birth would press the septum primum over the foramen opening, thereby functionally closing it. Collapses of the tunnel was seen in all the neonatal seals, and in the 1-month-old neonate the fold of tissue was anchored to the interatrial septum along the surface of the crista dividens, which lay in the left atrium. Cellular protrusions and thread formation may play a role in the closure of the foramen ovale. |
format |
Article in Journal/Newspaper |
author |
Macdonald, Alastair A. Dixon, Christopher Boyd, Ian L. |
author_facet |
Macdonald, Alastair A. Dixon, Christopher Boyd, Ian L. |
author_sort |
Macdonald, Alastair A. |
title |
Comparative anatomy of the cardiac foramen ovale in the Pinnipedia |
title_short |
Comparative anatomy of the cardiac foramen ovale in the Pinnipedia |
title_full |
Comparative anatomy of the cardiac foramen ovale in the Pinnipedia |
title_fullStr |
Comparative anatomy of the cardiac foramen ovale in the Pinnipedia |
title_full_unstemmed |
Comparative anatomy of the cardiac foramen ovale in the Pinnipedia |
title_sort |
comparative anatomy of the cardiac foramen ovale in the pinnipedia |
publisher |
Canadian Science Publishing |
publishDate |
1995 |
url |
http://dx.doi.org/10.1139/z95-100 http://www.nrcresearchpress.com/doi/pdf/10.1139/z95-100 |
geographic |
Antarctic Weddell |
geographic_facet |
Antarctic Weddell |
genre |
Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella bearded seal Crabeater Seal Erignathus barbatus Leptonychotes weddelli Lobodon carcinophagus Phoca hispida ringed seal Weddell Seal walrus* |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella bearded seal Crabeater Seal Erignathus barbatus Leptonychotes weddelli Lobodon carcinophagus Phoca hispida ringed seal Weddell Seal walrus* |
op_source |
Canadian Journal of Zoology volume 73, issue 5, page 850-857 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z95-100 |
container_title |
Canadian Journal of Zoology |
container_volume |
73 |
container_issue |
5 |
container_start_page |
850 |
op_container_end_page |
857 |
_version_ |
1785539335459700736 |