The present study was investigated the histological structure of the vesicular glands of eight mature castrated and noncastrated zaraibi bucks (4 animals/ each group). Generally, the vesicular gland of bucks was compact and lobulated gland. It was covered by a muscular capsule sending fibro-muscular septa dividing the gland into irregular unequal lobules. Each lobule was formed of numerous secretory acini and few amount of inter-acinar connective tissue stroma. Each lobule had a central collecting sinus to collect the secretions from the different acini. Both secretory acini and central collecting sinuses were lined mainly with pseudostratified columnar epithelium that was consisted mainly of secretory columnar cells and few small basal cells. The secretion was released into the acinar limen via apocrine mode. The castrated bucks showed more connective tissue and less acinar components in comparison to non-castrated bucks. Such finding represents the histological difference between the vesicular gland of castrated and non-castrated bucks that pointed out the effect of castration on structure of the vesicular gland.
Ciliogenesis was investigated in the uterine tube epithelium of control and superovulated heifers during day 1 to day 7 of the oestrous cycle. Seventy-two heifers were used, consisting of four control groups and four superovulated groups. All heifers received cloprostenol (PG) to induce oestrus (day 0). Superovulated heifers received 24 mg pFSH at doses of 4.5, 3.5, 2.5 and 1.5 mg given twice daily. Control and superovulated heifers were slaughtered on days 1, 3, 5 and 7 of the oestrous cycle. Samples from the ampulla, preisthmus and isthmus of the uterine tube were collected and processed for light and electron microscopy, following standard procedures. Both centriolar and acentriolar pathways were involved in the development of basal bodies. Formation of basal bodies and protrusion of ciliary shafts mostly occurred during days 1 and 3 of the oestrous cycle. The centriolar pathways, in which procentrioles generate with the aid of preexisting centrioles, played a minor role in the heifer uterine tube. In the acentriolar pathways, fibrous granules were the first structures which appeared in the course of ciliogenesis and they initially occurred in association with free ribosomes. Subsequently, deuterosomes arose in the aggregates of fibrous granules, and then procentrioles containing microtubules originated around deuterosomes or apart from deuterosomes. Newly formed centrioles migrated to the apical cytoplasm, and ciliary shafts extended first at the periphery of the luminal surface of ciliogenic cells. Deuterosomes as well as rootlet formation were considered to be related to the fibrous granules. Quantitative examinations by light microscopy showed that the number of ciliated cells in the ampullar, preisthmic and isthmic epithelium of the superovulated heifers was significantly higher than in the control heifers during day 1 and day 3 of the oestrous cycle.
Forty mature catfish of both sexes (n=10 per season; 5 males and 5 females) were used to study the effect of different seasons on the histological and histochemical structure of the gonads. The histological results showed that both testes and ovaries of the catfish were degenerated during winter that was considered as a resting season of the catfish gonadal activity. Both testes and ovaries began to restore their intact and fully mature structure during spring and continue the same during summer where the testes show distended seminiferous lobules with all spermatogenic cells and spermatozoa also, the ovaries showed the different developmental stages including mature follicles therefore, both spring and summer were considered as spawning season of the catfish. During autumn, both testes and ovaries appeared as spent gonads where the testes showed many empty seminiferous lobules and the ovaries showed many atretic follicles therefore, autumn was considered as post-spawning or spent season. The results of Gonado-Somatic Index (GSI) were coincided with the histological structure of the gonads where they show peak value during spring and summer (spawning season) and showed the lowest value during winter (resting season).
The epithelium of the uterine tube consists of ciliated cells and secretory cells. Basal cells are a third cell type observed in tubal epithelium and they are located principally in the basal part of the epithelium. The objectives of this study were to characterize these basal cells in normal and superovulated heifers and to determine whether they participate in the replacement of the ciliated and secretory cell populations. All heifers received cloprostenol (PG) to induce oestrus (day 0). Superovulated heifers received 24 mg pFSH at doses of 4.5, 3.5, 2.5 and 1.5 mg given twice daily. Control and superovulated heifers were slaughtered on days 1, 3, 5 and 7 of the oestrous cycle. Another group of normal cycling heifers was slaughtered on days 2–3 and 11–13 of the oestrous cycle and used for immunocytochemistry. Samples from ampulla, pre-isthmus and isthmus of the uterine tube were collected and processed for light and transmission electron microscopy. Quantitative examination by light microscopy showed that there was a significant difference in the number of basal cells between the regions of the heifers’ uterine tube. On the basis of ultrastructure two populations of basal cells were observed. One (type I) had a nucleus with much condensed heterochromatin and very sparse cytoplasmic organelles. The second cell (type II) had a nucleus with heterochromatin typically clumped around the nuclear envelope. Its cytoplasm contained many organelles including a number of lysosomes. The ultrastructural features of these cells were similar in all regions and at all days of the oestrous cycle examined. Immunocytochemistry revealed that type I basal cells were lymphocytes and type II basal cells were macrophages.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.