Anatomy of the sinus node, av node, and his bundle of the heart of the sperm whale ( Physeter macrocephalus ), with a note on the absence of an os cordis
Abstract Background : Atrioventricular (AV) conduction time in large whales is only slightly greater than in smaller mammals even though their hearts are enormously larger. Little is known of the detailed histology or cytology of the conduction system of large whales. Such knowledge could be useful...
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crwiley:10.1002/ar.1092420309 2024-03-17T08:59:55+00:00 Anatomy of the sinus node, av node, and his bundle of the heart of the sperm whale ( Physeter macrocephalus ), with a note on the absence of an os cordis James, Thomas N. Kawamura, Keishiro Meijler, Frits L. Yamamoto, Shoji Terasaki, Fumio Hayashi, Tetsuya 1995 http://dx.doi.org/10.1002/ar.1092420309 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Far.1092420309 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ar.1092420309 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor The Anatomical Record volume 242, issue 3, page 355-373 ISSN 0003-276X 1097-0185 Agricultural and Biological Sciences (miscellaneous) Anatomy journal-article 1995 crwiley https://doi.org/10.1002/ar.1092420309 2024-02-22T01:41:56Z Abstract Background : Atrioventricular (AV) conduction time in large whales is only slightly greater than in smaller mammals even though their hearts are enormously larger. Little is known of the detailed histology or cytology of the conduction system of large whales. Such knowledge could be useful in defining the nature of cardiac rhythm and conduction of the whale as well as smaller mammals including humans. Methods : We studied hearts from seven sperm whales. After fixation in formaldehyde and later dissection, specimens were prepared for histological examination. Results : Cell size, histological organization, and innervation of the sperm whale's sinus node, AV node, and His bundle are similar to most mammalian hearts, except the sinus node is substantially larger. There is no central fibrous body between the atrial and ventricular septa, and the whale has no os cordis. Only the upper quarter of the interventricular septum is fully formed; below that there is only a thin layer of fatty connective tissue between the two ventricles. Conclusions : Given our morphological findings, we believe that the whale's comparatively short AV conduction time may be best explained by the sinus node and AV node functioning as coupled relaxation oscillators. Absence of an os cordis or central fibrous body or strong attachment between the two ventricles may pose both electrophysiological and hemodynamic hazards when the whale is no longer in its normally buoyant aquatic environment. © 1995 Wiley‐Liss, Inc. Article in Journal/Newspaper Physeter macrocephalus Sperm whale Wiley Online Library The Anatomical Record 242 3 355 373 |
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crwiley |
language |
English |
topic |
Agricultural and Biological Sciences (miscellaneous) Anatomy |
spellingShingle |
Agricultural and Biological Sciences (miscellaneous) Anatomy James, Thomas N. Kawamura, Keishiro Meijler, Frits L. Yamamoto, Shoji Terasaki, Fumio Hayashi, Tetsuya Anatomy of the sinus node, av node, and his bundle of the heart of the sperm whale ( Physeter macrocephalus ), with a note on the absence of an os cordis |
topic_facet |
Agricultural and Biological Sciences (miscellaneous) Anatomy |
description |
Abstract Background : Atrioventricular (AV) conduction time in large whales is only slightly greater than in smaller mammals even though their hearts are enormously larger. Little is known of the detailed histology or cytology of the conduction system of large whales. Such knowledge could be useful in defining the nature of cardiac rhythm and conduction of the whale as well as smaller mammals including humans. Methods : We studied hearts from seven sperm whales. After fixation in formaldehyde and later dissection, specimens were prepared for histological examination. Results : Cell size, histological organization, and innervation of the sperm whale's sinus node, AV node, and His bundle are similar to most mammalian hearts, except the sinus node is substantially larger. There is no central fibrous body between the atrial and ventricular septa, and the whale has no os cordis. Only the upper quarter of the interventricular septum is fully formed; below that there is only a thin layer of fatty connective tissue between the two ventricles. Conclusions : Given our morphological findings, we believe that the whale's comparatively short AV conduction time may be best explained by the sinus node and AV node functioning as coupled relaxation oscillators. Absence of an os cordis or central fibrous body or strong attachment between the two ventricles may pose both electrophysiological and hemodynamic hazards when the whale is no longer in its normally buoyant aquatic environment. © 1995 Wiley‐Liss, Inc. |
format |
Article in Journal/Newspaper |
author |
James, Thomas N. Kawamura, Keishiro Meijler, Frits L. Yamamoto, Shoji Terasaki, Fumio Hayashi, Tetsuya |
author_facet |
James, Thomas N. Kawamura, Keishiro Meijler, Frits L. Yamamoto, Shoji Terasaki, Fumio Hayashi, Tetsuya |
author_sort |
James, Thomas N. |
title |
Anatomy of the sinus node, av node, and his bundle of the heart of the sperm whale ( Physeter macrocephalus ), with a note on the absence of an os cordis |
title_short |
Anatomy of the sinus node, av node, and his bundle of the heart of the sperm whale ( Physeter macrocephalus ), with a note on the absence of an os cordis |
title_full |
Anatomy of the sinus node, av node, and his bundle of the heart of the sperm whale ( Physeter macrocephalus ), with a note on the absence of an os cordis |
title_fullStr |
Anatomy of the sinus node, av node, and his bundle of the heart of the sperm whale ( Physeter macrocephalus ), with a note on the absence of an os cordis |
title_full_unstemmed |
Anatomy of the sinus node, av node, and his bundle of the heart of the sperm whale ( Physeter macrocephalus ), with a note on the absence of an os cordis |
title_sort |
anatomy of the sinus node, av node, and his bundle of the heart of the sperm whale ( physeter macrocephalus ), with a note on the absence of an os cordis |
publisher |
Wiley |
publishDate |
1995 |
url |
http://dx.doi.org/10.1002/ar.1092420309 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Far.1092420309 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ar.1092420309 |
genre |
Physeter macrocephalus Sperm whale |
genre_facet |
Physeter macrocephalus Sperm whale |
op_source |
The Anatomical Record volume 242, issue 3, page 355-373 ISSN 0003-276X 1097-0185 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ar.1092420309 |
container_title |
The Anatomical Record |
container_volume |
242 |
container_issue |
3 |
container_start_page |
355 |
op_container_end_page |
373 |
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