Comparative Histological and Ultrastructural Studies of the Thyroid Gland in Postnatal and Adult Female Egyptian Frugivorous Bat (Rousettus aegyptiacus)

2022 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Eman El- Nahass ◽  
atteyat selim ◽  
Sara Ebrahim
Keyword(s):  
Thyroid Gland ◽  
Adult Female ◽  
Ultrastructural Studies

Ultrastructural Studies on the Thyroid Gland of Dromedary Camel (Camelus dromedarius)

2021 ◽  
Author(s):  
Devendra Singh ◽  
Sanjeev Joshi ◽  
Pankaj Kumar Thanvi ◽  
Om Prakash Choudhary
Keyword(s):  
Electron Microscopy ◽  
Thyroid Gland ◽  
Mammalian Species ◽  
Dromedary Camel ◽  
New Delhi ◽  
Medical Sciences ◽  
Follicular Cells ◽  
Ultrastructural Studies ◽  
Transmission Electron ◽  
Thyroid Glands

Background: The previously reported information on the ultrastructure of the thyroid gland of the camel is meager as compared to other domestic animals; thus, the present study was designed to provide the ultrastructural features of the thyroid gland in the camel. Methods: The thyroid glands were collected from naturally died sixteen camels (n=16) of both sexes from Veterinary Clinical Complex, RAJUVAS, Bikaner, Rajasthan. The transmission electron microscopy (TEM) of the thyroid gland was done at Sophisticated Analytical Instrumental Facility (SAIF), Department of Anatomy, All India Institute of Medical Sciences, New Delhi. The standard protocol of AIIMS, New Delhi, was followed for electron microscopy. Result: The thyroid gland of the camel consisted of thyroid follicles comprised of cuboidal thyroid follicular cells. The follicular cells contained a nucleus with heterochromatin concentrated marginally on the nuclear membrane and the euchromatin was well dispersed in the nucleus with well-marked nucleoli. The nucleus of the follicular cell was rounded. The apical regions of the plasma membrane in follicular cells consisted of microvilli, which were numerous, thinner and finger-like in outline. The mitochondria appeared as round, oval, rod-shaped and dumbbell-shaped. The rough endoplasmic reticulum was visible as elongated, irregular, elliptical cisterns. The Golgi complex was well marked and consisted of flattened sacs, vacuoles and small vesicles. The parafollicular cells were found in small numbers and positioned basally between two follicular cells, close to the basement membrane. It can be concluded that the ultrastructure of the thyroid gland of the camel does not differ from that of other mammalian species.

THE EFFECT OF AUTOTRANSPLANTATION OF THE THYROID GLAND ON THE ONSET OF OESTRUS IN FERRETS

1963 ◽  
Vol 26 (2) ◽  
pp. 279-285 ◽  
Author(s):  
W. A. MARSHALL
Keyword(s):  
Thyroid Gland ◽  
Adult Female ◽  
Rectus Abdominis ◽  
Artificial Light ◽  
Rectus Abdominis Muscle ◽  
Deep Surface ◽  
Significant Difference

SUMMARY In nine adult female ferrets the thyroid gland was autotransplanted to the deep surface of the rectus abdominis muscle. Six animals were subjected to sham operations in which both the thyroid gland and the deep surface of the rectus abdominis muscle were exposed, but the thyroid was not actually transplanted. In the spring of 1961 the dates when signs of oestrus appeared in these two groups of animals were compared. There was no significant difference between the two groups; nineteen normal animals which were also kept under observation became oestrous at the same time. From 17 November 1961 onwards, the animals were exposed to artificial light from 4.30 to 10.30 p.m. daily in addition to ordinary daylight. In this part of the experiment sixteen normal animals were kept under observation together with the two groups of animals which had been treated surgically. Again, there was no significant difference between the dates on which signs of oestrus appeared in the three groups.

Trypanosome-induced depression of plasma thyroxine Levels in prepubertal and adult female goats

1988 ◽  
Vol 119 (1) ◽  
pp. 21-26 ◽  
Author(s):  
B. M. Mutayoba ◽  
H. B. O'hara-Ireri ◽  
S. Gombe
Keyword(s):  
Thyroid Gland ◽  
Adult Female ◽  
Post Infection ◽  
Trypanosoma Congolense ◽  
Significant Decline ◽  
Degenerative Changes ◽  
Thyroid Gland Function ◽  
Thyroid Glands ◽  
Gland Function ◽  
Marked Atrophy

Abstract. Changes in plasma T4 levels were investigated in prepubertal and adult female goats during the course of an experimental Trypanosoma congolense infection. A significant decline in the T4 levels was observed within 1 week of trypanosome challenge. The levels remained low up to the end of the 7th weeks when prepubertal goats received a trypanocidal treatment, whereafter the values started to rise to normal pre-infection values. The post-infection plasma T4 values in the untreated adult goats did not return to normal except in one resistant goat which recovered naturally after 16 weeks of the infection. The thyroid glands of chronically infected and untreated adult goats revealed marked atrophy, fibrosis and colloidopathy. It is concluded that trypanosomiasis rapidly impairs thyroid gland function in susceptible animals, but these changes can be reversed by early trypanocidal treatment before marked degenerative changes become evident or following self cure in resistant animals.

Correlation of Vaginal Smears and Surface Structure in the Normal Estrous Cycle of Rats

1985 ◽  
Vol 43 ◽  
pp. 654-655
Author(s):  
Kaufmann Robert C. ◽  
Khosho Francis K. ◽  
Amankwah Kofi S.
Keyword(s):  
Surface Structure ◽  
Estrous Cycle ◽  
Adult Female ◽  
Female Rats ◽  
Vaginal Smear ◽  
Vaginal Smears ◽  
Ultrastructural Studies ◽  
Ultrastructural Findings

Few studies regarding the normal estrous cycle of rats exist in the literature. Only the estrous and diestrous portions of the cycle have been studied in any detail in the spontaneous cycle of the rat. Ultrastructural studies of proestrous have been limited to artificially induced cycles. These artificially induced cycles have been unable to account for all the findings on vaginal smears seen in spontaneous cycles. In this study, vaginal smear findings were correlated to surface ultrastructural findings in the four main phases of spontaneous ovulatory cycles in rats.Adult female rats of the Sprague-Dawely strain were used and sacrificed during different phases of their cycles. Daily vaginal smears (8-11 a.m.) of at least two consecutive cycles were used to determine the phase of the normal estrous cycle for each rat.

Ultrastructure of Cercarial Tails

1974 ◽  
Vol 32 ◽  
pp. 180-181
Author(s):  
Richard S. Demaree ◽  
Donald M. Wootton
Keyword(s):  
Schistosoma Japonicum ◽  
Intermediate Hosts ◽  
Suitable Host ◽  
Ultrastructural Studies ◽  
Tail Structure

Cercariae (juvenile trematodes with tails) emerge from mollusk intermediate hosts and swim toward definitive hosts or encystment objects. The locomotor power is furnished by the tail. Upon reaching a suitable host or encystment object, the tail is cast off and the cercariae penetrate and/or encyst. Ultrastructural studies of cercariae are sparse. There is even lessUltrastructural studies of cercariae are sparse. There is even less information about the tail structure; and body-to-tail morphology has been documented only for Acanthatrium oregonense and Schistosoma japonicum.

Sign in / Sign up

Export Citation Format

Share Document