the male reproductive system merki 1990 220

... North American species (Dirks and Sternburg 1972) In the present work, the morphology of the male reproductive system, the spermatozoa and the number of spermatozoa per cyst were described for ... al 2005a) is therefore common among the social Hymenoptera In these species, the process of testis degeneration begins after the migration of the spermatozoa to the seminal vesicles The same process ... Histology of the male reproductive system of Polistes vesicolor D-E Photomicrograph of the spermatozoa and of the nucleus stained with DAPI, respectively A Longitudinal section from the region of the...

Ngày tải lên: 14/03/2014, 16:20

... in male reproductive system of the adult rat To identify the cells responsible for GSSG reduction, an attempt was made to determine the localization of GR in the male reproductive system of the ... localization in the male reproductive system of the adult rat (Fig 2) Epithelia from the epididymis, vas deferens, seminal vesicles, and prostate glands were strongly stained with the GR antibody In the ... reductase was also detected in the epithelia of the male genital tract In addition, glutathione S-transferase is present in the male reproductive system [45] Thus, the abundant expression of GR...

Ngày tải lên: 17/03/2014, 17:20

... Male Reproductive System Male Reproductive Anatomy and Physiology • Testis • Epididymis • Vas deferens • Seminal vesicle • Prostate • Bulbourethral • Ejaculatory duct • Urethra • Penis Male Reproductive ... Prostaglandins in semen: • Decrease the viscosity of mucus in the cervix • Stimulate reverse peristalsis in the uterus • Facilitate the movement of sperm through the female reproductive tract • Clotting ... Bulbourethral • Ejaculatory duct • Urethra • Penis Male Reproductive Anatomy The Male Reproductive System in Anterior View The Structure of the Testes Spermatogenesis • Takes about 74 days • Seminiferous...

Ngày tải lên: 28/03/2014, 14:20

... In the light microscope the spermatozoon appears to have only two parts: the head and the tail In the electron microscope, the tail can be subdivided further into the neck, the middle piece, the ... migrate in embryonic life to the gonadal ridges They comprise the bulk of the cells in the adult seminiferous tubule These form the other major category of cell types in the seminiferous tubules ... of the future sperm head The Cap Phase The acrosomal vesicle grows and forms the head cap that covers the anterior two third of the nucleus The two centrioles assemble at the caudal pole of the...

Ngày tải lên: 28/03/2014, 16:20

... covering epithelia found in the male reproductive systems of horses [9], bulls [1], and rats [2] The present study is largely consistent with these studies There is a general agreement that in the thoroughbred ... different The functional role of each lectin needs further study Taken together, these results suggest that covering epithelia have a specific glycoprotein in the reproductive system of male horses, ... changes (Fig 1) In the testis, SBA (Fig 2B), WGA (Fig 2E), and UEA-1 (Fig 2F) were specifically detected in the epithelial cells Fig Histological findings in the male reproductive system of thoroughbred...

Ngày tải lên: 07/08/2014, 17:22

... h_development/egg_structure.html I II III IV V Male Reproductive system Female Reproductive system Sex Determination Modes of reproduction Mating Sex Determination Nearly all are Bisexual (males & females) Many species ... Amphitokous: Both male and female produced (Thysanoptera) Hermaphroditic: Each individual has both reproductive sets I II III IV V Male Reproductive system Female Reproductive system Sex Determination ... female in copula Females mount each other to attract males Males disrupt female pseudocopulation Experimentally, males just as likely to mate with mounting female as with mounted female! Harari and...

Ngày tải lên: 28/03/2014, 14:20

Ngày tải lên: 02/04/2014, 17:59

Ngày tải lên: 07/08/2014, 17:22

... ỐNG SINH TINH SEMINIFEROUS TUBULES Ngồi bao mơ liên kết Màng đáy Biểu mô tinh (seminiferous epithelium) cấu tạo loại tế bào: tế bào Sertoli (tế bào nâng đỡ) tế bào dòng tinh (spermatogenic cells) ... bào đáy Tuyến hành niệu đạo Là biểu mơ tuyến kiểu ống túi Lót biểu mơ trụ đơn Tuyến niệu đạo Dọc theo niệu đạo dương vật tuyến kiểu túi tiết nhầy 20 21 Spermatids remain attached during maturation...

Ngày tải lên: 27/08/2017, 00:02

... magnification, ×40 Effects of tributyltin chloride on the reproductive system in pubertal male rats 33 Fig The changes in serum testosterone levels in the male rat following daily oral treatments with ... of age The dose volume was 1.5 ml/kg B.W The animals were sacrificed on the next day of final treatment Pathological evaluations: On the sacrifice day, rats were anesthetized using ethyl ether ... the seminal vesicle of rats, that is, the vesicles were narrowed and occupied with epithelial cells (Fig 4) The treatment of methyltestosterone did not show any histopathological changes in the...

Ngày tải lên: 07/08/2014, 17:22

... on the reproductive system, our results suggest that daily intake of genistein has no observable detrimental effects on male reproductive system The present study extend our knowledge of the ... everyday with the test compounds for weeks under the casein-based AIN-76A diet (Harlan Teklad, Madison, WI, USA) Animals were sacrificed under anesthesia with ethyl ether, and their reproductive ... Meanwhile, data for the exposure to genistein at adult stage is very limited The objective of the present study was to evaluate whether genistein causes adverse effects on reproductive system as exposed...

Ngày tải lên: 07/08/2014, 18:20

... trained; these are the most timeconsuming and expensive studies as the vast majority of baby boys 27 in the study will not have the disorders Finally, the larger the number of boys studied, the more ... exposure Male Reproductive Health Disorders and the Potential Role of Environmental Chemical Exposures Overview of prevalence and trends in male reproductive health disorders The reproductive ... edge of the glans or to the top of the penile shaft In moderate cases the meatus is located lower down the shaft and in severe cases lower still and perhaps even in the perineal region, the latter...

Ngày tải lên: 13/02/2014, 10:20

... when I had the pill, he used to act out and ask me why I am using them […] Then, there was another time I started using the Ring [the NuvaRing, a hormone-releasing ring placed in the vagina to ... abortion in the 5th month of the pregnancy Not all women did what their partners wanted them to do—some had abortions when their partners wanted them to have the child; some had children that their ... be unidirectional the modified arrows are circled in the figure We moved infertility from the box on the reproductive outcomes of IPV and reproductive control to the box on reproductive organ...

Ngày tải lên: 13/02/2014, 16:20

... shows the reported locations for estrogen synthesis in the adult male reproductive system from several species Early studies reported that the primary source of estrogen in the immature male was the ... development was harmful Then, in the decade of the 90's new discoveries in the male led to the hypothesis that estrogen not only has important functions in the adult male reproductive tract, but that ... throughout the male reproductive tract, but particularly ERα that is localized in the efferent ductule epithelium, where its expression is more abundant than even the female reproductive tract In the...

Ngày tải lên: 05/03/2014, 17:20

... the corona radiata) around the oocyte The midpiece of the sperm is derived from the mitochondria and other metabolic organelles of the cell, and the flagellum is derived from the centrioles The ... the female oocyte The nucleus of the cell becomes the head of the sperm, and the lysosomes become the acrosome (See Figure 28.9) The acrosome contains digestive enzymes in order to digest the cumulous ... in the epididymis In spermiogenesis all non-essential components of the spermatids are lost in order that the sperm have only the chromosomes and the machinery required to propel them to the...

Ngày tải lên: 28/03/2014, 14:20

... occur in men Breast cancer is the most common type of cancer in women and is the second leading cause of death by cancer in women, following only lung cancer In 2000, the American Cancer Society ... new cases of breast cancer were diagnosed in the United States The average woman at age 30 years has chance in 280 of developing breast cancer in the next 10 years This chance increases to in ... trophoblast and endometrum which is now called the chorion •Chorionic villi contact maternal blood supply •becomes an endocrine gland: •HCG (similar to LH) maintains the CL for months •Later, estrogen and...

Ngày tải lên: 03/07/2014, 05:20

... increased the frequencies of chromosomal aberration in the presence or absence of S9 mixture Moreover, the cells treated with 10 or 50 mM of acrylamide further increased the frequencies in the presence ... under the extreme condition, which is a dose of acrylamide at 60 mg/kg/days In summary, we have evaluated the genotoxicity and the toxicological effects of acrylamide on reproductive system in male ... histopathological changes in the seminiferous tubules (Fig 5B) There were thickening and multiple layering of the tubular endothelium, degeneration of germ cells, and the formation of many multinucleated...

Ngày tải lên: 07/08/2014, 18:21

... M The prostate gland is an essential organ of the male reproductive system Male Genitalia The male genitalia are the penis and the scrotum, a pouch of skin that holds the testes They grow to their ... What Is the Reproductive System? CH A P T E R   The Parts of the Reproductive System 15 CH A P T E R   How the Reproductive System Works 35 CH A P T E R   Problems with the Reproductive ... surround the opening of the vagina They include a pair of skin folds nearest the vagina called the 24 The Pa r ts of the Repro ductive System Female genitalia, such as the labia, help to protect the...

Ngày tải lên: 11/01/2015, 16:11

... the organs of the male reproductive system including the locations, structures, and functions of each 32.2 Describe the causes, signs and symptoms, and treatment of various disorders of the male ... disorders of the male reproductive system 32.3 Summarize the organs of the female reproductive system including the locations, structures, and functions of each 32.4 Describe the causes, signs and ... the most common sexually transmitted infections 32-4 Introduction • Male and female reproductive systems – Function together to produce offspring – Produce important hormones 32-5 The Male Reproductive...

Ngày tải lên: 22/05/2017, 16:32

... of the Male and Female Reproductive Systems Not all tissues in the reproductive tract are bipotential The internal reproductive structures (for example the uterus, uterine tubes, and part of the ... male reproductive structures female reproductive structures no reproductive structures male reproductive structures 50 percent of the time and female reproductive structures 50 percent of the ... and the different genitalia of male and female fetuses develop from the same tissues in the embryo View this animation that compares the development of structures of the female and male reproductive...

Ngày tải lên: 30/10/2017, 23:31