BACKGROUND Post-copulatory sexual selection has been shown to shape morphology of male gametes. Both directional and stabilizing selection on sperm phenotype have been documented in vertebrates in response to sexual promiscuity. METHODOLOGY Here we investigated the degree of variance in apical hook length and tail length in six taxa of murine rodents. CONCLUSIONS Tail sperm length and apica...

Larger testes are considered the quintessential adaptation to sperm competition. However, the strong focus on testis size in evolutionary research risks ignoring other potentially adaptive features of testicular function, many of which will also be shaped by post-mating sexual selection. Here we advocate a more integrated research programme that simultaneously takes into account the development...

A sandwich e.l.i.s.a. method was developed to examine the distribution of lactoferrin in mouse reproductive tract. The lactoferrin concentration was found to be much higher in oviduct, uterus, vagina, vas deferens or epididymis than in serum, but the concentration in ovary, testis, seminal vesicle, prostate or coagulating gland was comparable with that in serum. The existence of lactoferrin in ...

our readers an outline only of the scope of this book. The volume is divided into ten parts as follows,?general principles, non-venereal diseases of the penis, diseases of the urethra, chancroid and bubo, syphilis, diseases affecting sexual physiology, diseases of the prostate, of the urinary bladder, of the kidney and ureter, and of the testis and spermatic cord. The volume has no less than 23...

Two important functions of testis are production of spermatozoa and synthesis of steroids. These functions depend on anatomical, hormonal and constitutional homeostasis and begin during the first stage of gestation. Cryptorchidism can be defined as an abnormal localization of one or both testes. It’s the failure of one or both testes descent into the scrotal sac. The third trimester in humans i...

A patient with a 46,XY chromosome constitution showed the following main characteristics: eunuchoidal body habitus, lack of secondary sexual development, normal female external genitalia with absence of vagina, no gonadal structures, and complete lack of internal genitalia except for rudimentary ductal structures defined by histological examination. Her condition is clearly different from that ...

www.trendsinmenshealth.com TRENDS IN UROLOGY & MEN’S HEALTH NOVEMBER/DECEMBER 2016 Testosterone, the most important androgen produced by the testes, plays an integral role in male health.1,2 Hypogonadism, or a low circulating level of testosterone, is associated with sexual dysfunction, and lower testosterone levels correlate with greater severity of erectile dysfunction.3 Testosterone levels d...

OBJECTIVE This study explored the effects of a cognitive task analysis (CTA)-informed curriculum to increase surgical skills performance and self-efficacy beliefs for medical students and postgraduate surgical residents learning how to perform an open cricothyrotomy. METHODS Third-year medical students and postgraduate year 2 and 3 surgery residents were assigned randomly to either the CTA gr...

Introduction: Diabetes mellitus has adverse effects on male sexual and reproductive functions in human and animals. Diabetes results in reduced fertility and libido. Medicinal plants have attracted much attention in controlling many diseases such as diabetes. In the present study, we aimed to investigate the effect of garlic juice on testicular damage. Methods: Forty male rats (250±20) wer...