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17487

Anatomical and Histochemical Studies of the thyroid gland of two Egyptian reptiles

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Last updated: 24 Dec 2024

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Abstract

Two species of lizards are used in the present work Eumeces schneiderii as a hibernating reptile and Laudakia stellio brachydactyla as a non-hibernating one. Macroscopically, the thyroid of Eumeces schneiderii is formed of separate paired structures lying on both sides of the bifurcation of left and right carotid arteries. The thyroid of Laudakia, is formed of two well defined lobes each lying on either side of the trachea with a narrow connecting isthmus. Microscopically, the thyroid gland in both animals is composed of a big number of follicles which are held together by a loose connective tissue. The Interfollicular spaces are filled with blood sinusoids. Each follicle is composed of one layer of epithelial cells, which vary in their heights from winter to summer. In Laudakia, the gland never become completely inactive during winter. In Eumeces schneiderii , it is completely inactive during hibernation. Intracellular colloid droplets are rarely found in the thyroid of Laudakia, while they are very frequent In Eumeces schneiderii. This colloid shows regular seasonal changes in both animals depending on the degree of activity of acini.

DOI

10.21608/ejhm.2009.17487

Authors

First Name

Boshra A.

Last Name

El-Salkh

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Affiliation

Department of Zoology, Faculty of Science, Al-Azhar University for Girls and boys, Nasr City, Cairo, Egypt

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First Name

Zaki T.

Last Name

Zaki

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Department of Zoology, Faculty of Science, Al-Azhar University for Girls and boys, Nasr City, Cairo, Egypt

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First Name

Ibrahem G.

Last Name

Ibrahem

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Department of Zoology, Faculty of Science, Al-Azhar University for Girls and boys, Nasr City, Cairo, Egypt

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First Name

Samia

Last Name

Saad

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-

Affiliation

Department of Zoology, Faculty of Science, Al-Azhar University for Girls and boys, Nasr City, Cairo, Egypt

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Volume

37

Article Issue

1

Related Issue

3685

Issue Date

2009-10-01

Receive Date

2018-10-24

Publish Date

2009-10-01

Page Start

742

Page End

758

Print ISSN

1687-2002

Online ISSN

2090-7125

Article File

EJHM_Volume 37_Issue 1_Pages 742-758.pdf

PDF . 871.3kB

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https://ejhm.journals.ekb.eg/article_17487.html

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https://ejhm.journals.ekb.eg/service?article_code=17487

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Original Article

Type Code

606

Publication Type

Journal

Publication Title

The Egyptian Journal of Hospital Medicine

Publication Link

https://ejhm.journals.ekb.eg/

MainTitle

Anatomical and Histochemical Studies of the thyroid gland of two Egyptian reptiles

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Article

Created At

22 Jan 2023