An Overview Of The Male Reproductive System

A diagram of reproduction regulation in the male is presented in Figure 37.1. The system is divided into factors affecting male function: brain centers, which control pituitary release of hormones and sexual behavior,- gonadal

Environment

Environment

Reproductive Hormones

^FGUREISHI^^ Regulation of reproduction in the male.

The main reproductive hormones are shown in boxes. Positive and negative regulations are depicted by plus and minus signs, respectively.

^FGUREISHI^^ Regulation of reproduction in the male.

The main reproductive hormones are shown in boxes. Positive and negative regulations are depicted by plus and minus signs, respectively.

structures, which produce sperm and hormones,- a ductal system, which stores and transports sperm,- and accessory glands, which support sperm viability.

The endocrine glands of the male reproductive system include the hypothalamus, anterior pituitary, and testes. The hypothalamus processes information obtained from the external and internal environment using neurotransmitters that regulate the secretion of gonadotropin-releasing hormone (GnRH). GnRH moves down the hypothalamic-pituitary portal system and stimulates the secretion of LH and FSH by the gonadotrophs of the anterior pituitary. LH binds to receptors on the Leydig cells and FSH binds to receptors on the Sertoli cells. Leydig cells reside in the inter-stitium of the testes, between seminiferous tubules, and produce testosterone. Sertoli cells are located within the seminiferous tubules, support spermatogenesis, contain FSH and testosterone receptors, and produce estradiol, albeit at low levels.

Testosterone belongs to a class of steroid hormones, the androgens, which promote "maleness." It carries out multiple functions, including feedback on the hypothalamus and anterior pituitary,- the support of spermatogenesis,- the regulation of behavior, including sexual behavior,- and the development and maintenance of secondary sex characteristics. Sertoli cells also produce glycoprotein hormones— nhibin, activin, and follistatin—that regulate the secretion of FSH.

The duct system that transports sperm from the testis to the outside through the penis includes the epididymis, vas deferens, and urethra. The sperm acquire motility and the capability to fertilize in the epididymis,- they are stored in the epididymis and in the vas deferens. They are trans ported via the urethra through the penis and are ultimately expelled by ejaculation. The accessory structures of the male reproductive tract include the prostate gland, seminal vesicles, and bulbourethral glands. These glands contribute several constituents to the seminal fluid that are necessary for maintaining functional sperm.

Pregnancy Guide

Pregnancy Guide

A Beginner's Guide to Healthy Pregnancy. If you suspect, or know, that you are pregnant, we ho pe you have already visited your doctor. Presuming that you have confirmed your suspicions and that this is your first child, or that you wish to take better care of yourself d uring pregnancy than you did during your other pregnancies; you have come to the right place.

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Responses

  • donnamira
    How are reproductiv hormones monitored?
    7 years ago
  • Fredegar Lightfoot
    What is the role of the hormones in the reproduction system?
    7 years ago

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