Titlebook: Endocrinology of the Testis and Male Reproduction; Manuela Simoni,Ilpo T. Huhtaniemi Reference work 2017 Springer International Publishing

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Hormonal Laboratory Examinationause of impaired fertility, as is the case in hypogonadotropic hypogonadism (HH), but impaired hormone levels can also be the consequence of impaired fertility, as in men affected by hypergonadotropic hypogonadism. In this chapter the hormones involved in male fertility and their laboratory examination will be discussed.

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Rules of Territoriality and Discoursedotropes. These G.-coupled receptors mediate acute effects of GnRH on the exocytotic secretion of luteinizing hormone and follicle-stimulating hormone and also chronic regulation of the synthesis of these gonadotropin hormones. GnRH is secreted in brief pulses and GnRH effects on its target cells ar

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Bernard R. Hurley MD,Carl D. Regillo MDone receptor subgroup of type A G protein-coupled receptors (GPCRs). LHCGR binds specifically the two structurally similar gonadotrophins, luteinizing hormone (LH) and human chorionic gonadotrophin (hCG), and FSHR binds follicle-stimulating hormone (FSH). The receptors reside on plasma membrane and

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Heterogeneity of Usher Syndrome Type Iiation of the gonad into a testis or ovary. The gonad develops as an undifferentiated primordium that is initially indistinguishable between XX (female) and XY (male) embryos; the gonad is a uniquely bipotential organ in its ability to give rise to a testis or ovary. Prior to sex determination, the

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CRALBP and Inherited Retinal Degenerationollowing sex determination at around weeks 5–6, the somatic cells of the testis begin to differentiate into hormone-producing Sertoli and Leydig cells. The latter cells share similar origins to the steroidogenic cells of the adrenal cortex and fetal zones which at this stage of human development are

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https://doi.org/10.1007/978-3-642-96530-2uring sex determination, the bipotential gonadal primordium develops – according to chromosomal sex – into either testis or ovary. Sexual differentiation subsequently involves fetal gonadal production of peptide and steroid hormones that are responsible for male or female phenotype..This process occ