Adenohypophysis of the elephant seal ( Mirounga leonina): Morphology and seasonal histological changes
Abstract Changes in adenohypophyseal cell populations over a 12‐month period were studied in the seasonally breeding elephant seal (24 adult males, 3 adult females, and 5 neonates) at Macquarie Island. The glands were weighed and fixed in formol sublimate. Selected sections were stained with the oxi...
Published in: | American Journal of Anatomy |
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crwiley:10.1002/aja.1001760410 2024-06-02T08:06:00+00:00 Adenohypophysis of the elephant seal ( Mirounga leonina): Morphology and seasonal histological changes Griffiths, D. J. Bryden, M. M. 1986 http://dx.doi.org/10.1002/aja.1001760410 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Faja.1001760410 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aja.1001760410 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor American Journal of Anatomy volume 176, issue 4, page 483-495 ISSN 0002-9106 1553-0795 journal-article 1986 crwiley https://doi.org/10.1002/aja.1001760410 2024-05-03T10:48:54Z Abstract Changes in adenohypophyseal cell populations over a 12‐month period were studied in the seasonally breeding elephant seal (24 adult males, 3 adult females, and 5 neonates) at Macquarie Island. The glands were weighed and fixed in formol sublimate. Selected sections were stained with the oxidation‐alcian blue‐periodic acid Schiff‐orange G technique. Gonadotropic, thyrotropic, lactotropic, and somatotropic cells were readily identifiable; whilst corticotropes, inactive secretory cells of all types, and stellate cells were not stained and were counted collectively as chromophobic cells. Hypophyseal weight was low throughout autumn and winter, but increased significantly during the spring breeding season and the summer. Thyrotropes were distributed evenly throughout the pars distalis, but the other secretory cells showed areas of concentration. Acidophils were common peripherally, particularly lactotropes, while gonadotropes were largely confined to the ‘basophilic wedge,’ a narrow, central superior zone. In males, lactotropic and gonadotropic cells showed significant seasonal changes in number. Gonadotropes were more common in sexually active males than sexually quiescent ones, while lactotrope numbers were much greater at midsummer than midwinter. This lactotrope cycle appeared to be related to photoperiod but unrelated to breeding. Article in Journal/Newspaper Elephant Seal Macquarie Island Mirounga leonina Wiley Online Library Midwinter ENVELOPE(139.931,139.931,-66.690,-66.690) American Journal of Anatomy 176 4 483 495 |
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collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Changes in adenohypophyseal cell populations over a 12‐month period were studied in the seasonally breeding elephant seal (24 adult males, 3 adult females, and 5 neonates) at Macquarie Island. The glands were weighed and fixed in formol sublimate. Selected sections were stained with the oxidation‐alcian blue‐periodic acid Schiff‐orange G technique. Gonadotropic, thyrotropic, lactotropic, and somatotropic cells were readily identifiable; whilst corticotropes, inactive secretory cells of all types, and stellate cells were not stained and were counted collectively as chromophobic cells. Hypophyseal weight was low throughout autumn and winter, but increased significantly during the spring breeding season and the summer. Thyrotropes were distributed evenly throughout the pars distalis, but the other secretory cells showed areas of concentration. Acidophils were common peripherally, particularly lactotropes, while gonadotropes were largely confined to the ‘basophilic wedge,’ a narrow, central superior zone. In males, lactotropic and gonadotropic cells showed significant seasonal changes in number. Gonadotropes were more common in sexually active males than sexually quiescent ones, while lactotrope numbers were much greater at midsummer than midwinter. This lactotrope cycle appeared to be related to photoperiod but unrelated to breeding. |
format |
Article in Journal/Newspaper |
author |
Griffiths, D. J. Bryden, M. M. |
spellingShingle |
Griffiths, D. J. Bryden, M. M. Adenohypophysis of the elephant seal ( Mirounga leonina): Morphology and seasonal histological changes |
author_facet |
Griffiths, D. J. Bryden, M. M. |
author_sort |
Griffiths, D. J. |
title |
Adenohypophysis of the elephant seal ( Mirounga leonina): Morphology and seasonal histological changes |
title_short |
Adenohypophysis of the elephant seal ( Mirounga leonina): Morphology and seasonal histological changes |
title_full |
Adenohypophysis of the elephant seal ( Mirounga leonina): Morphology and seasonal histological changes |
title_fullStr |
Adenohypophysis of the elephant seal ( Mirounga leonina): Morphology and seasonal histological changes |
title_full_unstemmed |
Adenohypophysis of the elephant seal ( Mirounga leonina): Morphology and seasonal histological changes |
title_sort |
adenohypophysis of the elephant seal ( mirounga leonina): morphology and seasonal histological changes |
publisher |
Wiley |
publishDate |
1986 |
url |
http://dx.doi.org/10.1002/aja.1001760410 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Faja.1001760410 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aja.1001760410 |
long_lat |
ENVELOPE(139.931,139.931,-66.690,-66.690) |
geographic |
Midwinter |
geographic_facet |
Midwinter |
genre |
Elephant Seal Macquarie Island Mirounga leonina |
genre_facet |
Elephant Seal Macquarie Island Mirounga leonina |
op_source |
American Journal of Anatomy volume 176, issue 4, page 483-495 ISSN 0002-9106 1553-0795 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/aja.1001760410 |
container_title |
American Journal of Anatomy |
container_volume |
176 |
container_issue |
4 |
container_start_page |
483 |
op_container_end_page |
495 |
_version_ |
1800750882884681728 |