Adenohypophysis of the elephant seal (Mirounga leonina): Morphology and seasonal histological changes

Griffiths D.J. and Bryden M.M. (1986) Adenohypophysis of the elephant seal (Mirounga leonina): Morphology and seasonal histological changes. American Journal of Anatomy, 176 4: 483-495. doi:10.1002/aja.1001760410


Author Griffiths D.J.
Bryden M.M.
Title Adenohypophysis of the elephant seal (Mirounga leonina): Morphology and seasonal histological changes
Journal name American Journal of Anatomy   Check publisher's open access policy
ISSN 0002-9106
Publication date 1986-01-01
Sub-type Article (original research)
DOI 10.1002/aja.1001760410
Open Access Status Not yet assessed
Volume 176
Issue 4
Start page 483
End page 495
Total pages 13
Language eng
Subject 2702 Anatomy
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. Copyright
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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