Experimental hypothyroidism during sexual development Testes size and number of spermatozoa in adulthood are determined by postnatal/pubertal proliferation of seminal tubule somatic cell constituents, the Sertoli cells. Cessation of proliferation of Sertoli cells during early development occurs concomitantly with formation of their terminally differentiated population. Transient experimental hy...

THE DEVELOPMENT OF THE MAMMALIAN REPRODUCTIVE SYSTEM INVOLVES: (1) an indifferent or ambisexual stage, in which both the male (Wolffian) and female (Mullerian) duct systems are present; (2) sexual differentiation, in which the phenotypic sex is expressed by the enhancement of Mullerian structures in the female and Wolffian structures in the male and reciprocal suppression of the opposite duct s...

Alcohol use affects all three parts of the hypothalamic-pituitary-gonadal (HPG) axis, a system of endocrine glands and hormones involved in male reproduction. Alcohol use is associated with low testosterone and altered levels of additional reproductive hormones. Researchers are investigating several potential mechanisms for alcohol's damage. These mechanisms are related to alcohol metabolism, a...

Relaxin (RLN) belongs to a family of hormones structurally related to insulin and presents a broad spectrum of actions. Humans have three forms of RLN, encoded by three different genes (RLN1, RLN2 and RLN3), but nonprimate vertebrates have only two forms of relaxin (RLN1 and RLN3). RLN1 of these animals is encoded by Rln1, orthologous to the human RLN2 gene, and both genes, Rln1 and human RLN2,...

Many diseases and medications can affect the urinary system and its function. Assessment of the male genitalia is accomplished with inspection and palpation. It is important to chart what is seen, what is felt, and what the patient reports.

The male reproductive hormonal axis Maintenance of normal reproductive function is depend­ ent on the coordinated release of hormones in the hyp o­ thalamic−pituitary−testis cascade. Gonadotropin­releasing hormone (GnRH) is released in a pulsatile pattern into the pitu­ itary portal blood system from neuroendocrine cells in the basal hypothalamus and acts to stimulate gonadotropes in the anter­...

The copulatory act in Acanthocephala requires a complicated set of responses on the part of the male worm. The muscles associated with these responses include a set of bursal protrusor muscles plus a large bursal depressor muscle which participates in the eversion of the bursa. The anterior and posterior bursal accessory muscles are associated with the bursal depressor muscle and are described ...

Eleven cases of involvement of the genital tract in paracoccidioidomycosis were collected in a retrospective study of the clinical records of 683 patients seen in Porto Alegre, Rio Grande do Sul, Brazil. These cases are herein summarily reported. Eighteen similar cases were gathered in review of the Brazilian literature. Obtained data are discussed.

OBJECTIVE To evaluate the health effects of parental dietary exposure to GM rice TT51 on the male reproductive system of rat off spring. METHODS Rice-based diets, containing 60% ordinary grocery rice, MingHui63, or TT51 by weight, were given to parental rats (15 males/30 females each group) for 70 days prior mating and throughout pregnancy and lactation. After weaning, eight male offspring ra...