Unit 10: Reproductive System - Male Reproductive System Functional Anatomy ● Testes(where sperm is produced epididymis(where sperm is matured various

Unit 10: Reproductive System - Male Reproductive System...

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Male Reproductive System Functional Anatomy Testes (where sperm is produced), epididymis (where sperm is matured), various glands that produce the fluid components of semen, vas deferens (delivers sperm to the urethra), and external genitalia (scrotum and penis) Testes consists of blind-ended coiled tubules called seminiferous tubules - between these tubules are interstitial cells that produce testosterone (needed for sperm production and maturation) Epididymis is the first part of the tubular system that carries sperm from the body, made up of a series of coiled tubules which sperm pass through prior to ejaculation (immature sperm leaving the testes spend about 20 days in the epididymis where they learn how to swim lol) The epididymis and vas deferens are the main sites of sperm storage - sperm will eventually leave the vas deferens and enter the ejaculatory duct, which passes through the prostate gland (leads to urethra and then passes through the peen) There are two glands that contribute to the formation of semen, the prostate and seminal vesicle Prostate gland produces a milky fluid that activates the sperm Seminal vesicle nourishes and activates the sperm Just over half of semen volume is provided by the seminal vesicle and that fluid contains sugar, vitamin C and prostaglandins The bulbourethral gland, produces mucus to cleanse the urethra of residual urine - secretes thick clear mucus (during sexual foreplay lol) and functions to cleanse the urethra of urine and acts as lube during intercourse Semen Refers to the ejaculative fluid (sperm and the nutritive fluid) Seminal vesicle provides sugar (fructose) which gives energy to sperm cells Is an alkaline fluid that neutralizes the acidic environment of the vagina Also antibacterial properties and has stuff that enhances sperm mobility External Genitalia The descent of the testes is important because sperm do not mature well at body temp - so descended testes make sperm maturation easier The tip of the shaft is enlarged and it is called the glans penis Penile Erection and Ejaculation Blood flow into the penis is therefore caused by vasodilation of the vessels at the base of the penis Ejaculation has two components; emission and expulsion Emission involves waves of contraction of smooth muscles in the vas deferens, seminal vesicles, ejaculatory ducts and prostate that push semen into the urethra Expulsion on the other hand involves rhythmic contractions of skeletal muscles at
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the base of the penis that forces semen along the urethra and out of the penis (the actual ejaculation) Sperm Production Sperm Has three parts: the head, the midpiece and the tail The head contains the cell nucleus and is covered by a special membrane called the acrosome The midpiece contains a large mitochondria that provides the energy needed for the sperm to swim The tail consists of a flagellum that is moved in a rotating manner to propel the activated sperm
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  • Spring '14
  • progesterone, Ovulation

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