Sertoli cell

is the process by which male primordial germ cells called spermatogonia undergo meiosis, and produce a number of cells termed spermatozoa. The initial cells in this pathway are called primary spermatocytes. The primary spermatocyte divides into two secondary spermatocytes; each secondary spermatocyte then divides into two spermatids. These develop into mature spermatozoa, also known as sperm cells. Thus, the primary spermatocyte gives rise to two cells, the secondary spermatocytes, and the two secondary

0.03% immediately before use. Finally, the sections were rinsed with PBS and the slides were counterstained using two drops or 100 μL of haematoxylin. The slides were later washed in distilled water until the sections turned blue. Finally, the slides were dehydrated in ascending grades of ethanol (70%, 95%, and 100%) for 5 min each, cleared in xylene, followed by mounting with Histomount and a coverslip. 2.6. Quantitative assessments For quantitative histopathological assessment, three sections per

Biopsy procedure Samples were blinded for the ICSI laboratory examiner. For all patients, open surgery biopsy was applied to retrieve specimen of sperm. At the beginning of open biopsy, the skin over the testicle was cleaned with a germ-killing (antiseptic) medicine. The area around covered with a sterile towel. (As like what was done in onset of local anesthesia.) The testis was grasped between the thumb and forefinger of the non-dominant hand. An incision was then made over the same area immediately

Jillian Greenwood ADS 4613 10-24-2016 Seasonal changes in reproductive behavior and spermatogenesis in the stallion Horses are polyestrous, seasonal breeders with mid-summer foaling and mating seasons in late spring. Breeding occurs when the mare experiences photoperiod, which is the exposure to daylight within a 24 hour period. As a result, the mare becomes receptive, and the stallion becomes more dominate. Testosterone increases which promotes increased reproductive behavior, spermatogenesis

Impact of Endosulfan on Male Reproductive functions - a review ABSTRACT Endosulfan is an organochlorine insecticide and acaracide used to control a broad range of insect and arthropod pests on a wide variety of crops in many agrosystems. It can cause acute and chronic toxicity. Endosulfan is a neurotoxin, haematoxin, genotoxin and nephrotoxin. Toxicity of this insecticide on reproductive organs is confirmed. So this article reviews experimental and epidemiological studies of reproductive toxicity

Introduction Gametogenesis refers to the production of haploid sex cells within an organism. The haploid sex cells are composed of half of the genetic material of that from the germ-line of the parents. The process of gametogenesis could not take place without two specific organs, the ovary and the testis. These two organs, the gonads, are composed of germ cells where meiosis occurs. Meiosis is the method that makes the germ cells haploid. In both males and females, this phenomenon can be observed

generated from one single cell of the parent making them genetically identical. Identical twins, can also occur naturally in humans and most mammals, and are produced when one fertilized egg splits creating two separate embryos from the one, which means the DNA sets will be almost identical to one another. (National) Additionally, Somatic cell nuclear cloning is a specific type of reproductive cloning that has often been used to create animal clones. The topic of somatic cell nuclear cloning has been

blood through incompetent valves of the spermatic veins and there is good evidence to support this theory.( Skandhan& Rajahariprasad , 2007).The elevated intrascrotal temperature results in reductions of testosterone synthesis by Leydig cells and reduced Sertoli cell secretory function. increased testicular temperature in men with varicocele may reduced sperm quality and testicular functions ,Varicocele ligation has been demonstrated to be associated with reductions in intrascrotal temperature in

becomes tightly wound and the genes are inaccessible. b. What happens to the amount of GFP mRNA? It reduces, there is almost none left. c. What happens to the amount of green fluorescent protein? It also reduces. d. What happens to the appearance of the cell? It becomes faded with a faint green color. 3. Click on the Labels button near the control knob to reveal the following three links that reveal information when clicked. Summarize the function of each: a. a. histone – these are a type of protein that

Cells That Read Minds 2 This article is about brain cells reaction that is called mirror neurons. This cell will react to different sounds or movement. The researchers found that on monkeys when they heard or saw a certain kind of movement that would make a sound or gesture. Also, that found reactions happen within Humans, also. Dr. Rizzolattis said it took them several years