Anatomical variations in the cerebral arterial circle of the Saimaa ( Pusa hispida saimensis) and Baltic ringed seals ( Pusa hispida botnica)
Abstract The intracranial arterial vascularization of the Saimaa ringed seals ( Pusa hispida saimensis Nordquist, 1899) and Baltic ringed seals ( Pusa hispida botnica Gmelin, 1788) disclosed patterns of anatomical architecture comparable to that of other pinniped species. Arterial silicone casts on...
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Online Access: | http://dx.doi.org/10.1002/ar.25322 |
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crwiley:10.1002/ar.25322 2024-06-02T08:13:34+00:00 Anatomical variations in the cerebral arterial circle of the Saimaa ( Pusa hispida saimensis) and Baltic ringed seals ( Pusa hispida botnica) Laakkonen, Juha Nihtilä, Heini Jernvall, Jukka Helsingin Yliopisto Jane ja Aatos Erkon Säätiö 2023 http://dx.doi.org/10.1002/ar.25322 en eng Wiley http://creativecommons.org/licenses/by/4.0/ The Anatomical Record volume 307, issue 3, page 677-689 ISSN 1932-8486 1932-8494 journal-article 2023 crwiley https://doi.org/10.1002/ar.25322 2024-05-03T10:48:38Z Abstract The intracranial arterial vascularization of the Saimaa ringed seals ( Pusa hispida saimensis Nordquist, 1899) and Baltic ringed seals ( Pusa hispida botnica Gmelin, 1788) disclosed patterns of anatomical architecture comparable to that of other pinniped species. Arterial silicone casts on skull scaffolds, and magnetic resonance imaging (MRI) showed that the besides joining the caudal communicating arteries upon entering the cerebral arterial circle, the bilateral internal carotid arteries bifurcated as laterally oriented rostral choroidal arteries and rostral cerebral arteries. The latter arteries almost immediately gave off the laterally oriented middle cerebral arteries. Numerous individual variations were evident in differences in the exact branching sites of bilateral vessels or the size or number of arterial branches. Two Saimaa ringed seals had only a tiny foramen for the left internal carotid artery to enter the intracranial space, and the intracranial part of this vessel was short. It did not reach the cerebral arterial circle. The intracranial part of the right internal carotid artery is bifurcated and also supplied the left side of the cerebral arterial circle. Both specimens had aplasia of the left rostral cerebral artery. The intracranial arterial arrangement of Saimaa and Baltic ringed seals reflects the arterial architecture of this body region in terrestrial mammals with little evidence for aquatic adaptations or changes related to thermoregulation. Article in Journal/Newspaper Pusa hispida Wiley Online Library The Anatomical Record |
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Wiley Online Library |
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English |
description |
Abstract The intracranial arterial vascularization of the Saimaa ringed seals ( Pusa hispida saimensis Nordquist, 1899) and Baltic ringed seals ( Pusa hispida botnica Gmelin, 1788) disclosed patterns of anatomical architecture comparable to that of other pinniped species. Arterial silicone casts on skull scaffolds, and magnetic resonance imaging (MRI) showed that the besides joining the caudal communicating arteries upon entering the cerebral arterial circle, the bilateral internal carotid arteries bifurcated as laterally oriented rostral choroidal arteries and rostral cerebral arteries. The latter arteries almost immediately gave off the laterally oriented middle cerebral arteries. Numerous individual variations were evident in differences in the exact branching sites of bilateral vessels or the size or number of arterial branches. Two Saimaa ringed seals had only a tiny foramen for the left internal carotid artery to enter the intracranial space, and the intracranial part of this vessel was short. It did not reach the cerebral arterial circle. The intracranial part of the right internal carotid artery is bifurcated and also supplied the left side of the cerebral arterial circle. Both specimens had aplasia of the left rostral cerebral artery. The intracranial arterial arrangement of Saimaa and Baltic ringed seals reflects the arterial architecture of this body region in terrestrial mammals with little evidence for aquatic adaptations or changes related to thermoregulation. |
author2 |
Helsingin Yliopisto Jane ja Aatos Erkon Säätiö |
format |
Article in Journal/Newspaper |
author |
Laakkonen, Juha Nihtilä, Heini Jernvall, Jukka |
spellingShingle |
Laakkonen, Juha Nihtilä, Heini Jernvall, Jukka Anatomical variations in the cerebral arterial circle of the Saimaa ( Pusa hispida saimensis) and Baltic ringed seals ( Pusa hispida botnica) |
author_facet |
Laakkonen, Juha Nihtilä, Heini Jernvall, Jukka |
author_sort |
Laakkonen, Juha |
title |
Anatomical variations in the cerebral arterial circle of the Saimaa ( Pusa hispida saimensis) and Baltic ringed seals ( Pusa hispida botnica) |
title_short |
Anatomical variations in the cerebral arterial circle of the Saimaa ( Pusa hispida saimensis) and Baltic ringed seals ( Pusa hispida botnica) |
title_full |
Anatomical variations in the cerebral arterial circle of the Saimaa ( Pusa hispida saimensis) and Baltic ringed seals ( Pusa hispida botnica) |
title_fullStr |
Anatomical variations in the cerebral arterial circle of the Saimaa ( Pusa hispida saimensis) and Baltic ringed seals ( Pusa hispida botnica) |
title_full_unstemmed |
Anatomical variations in the cerebral arterial circle of the Saimaa ( Pusa hispida saimensis) and Baltic ringed seals ( Pusa hispida botnica) |
title_sort |
anatomical variations in the cerebral arterial circle of the saimaa ( pusa hispida saimensis) and baltic ringed seals ( pusa hispida botnica) |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/ar.25322 |
genre |
Pusa hispida |
genre_facet |
Pusa hispida |
op_source |
The Anatomical Record volume 307, issue 3, page 677-689 ISSN 1932-8486 1932-8494 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ar.25322 |
container_title |
The Anatomical Record |
_version_ |
1800737111574315008 |