Download Free Medical The Male Reproductive System PowerPoint Presentation

The Male Reproductive System PowerPoint Presentation

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Description : Download free Male Reproductive System PowerPoint presentation with slides on Male Reproductive System and sperm production.

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Published on : Aug 17, 2017 | Views : 11971 | Downloads : 139

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lolliwels

really helpful, gave me some great ideas for delivering this to my students, thank you!

Transcript

Slide 1-

The Male Reproductive System
Slide 2-

Spermatogenesis, the production of the male half of the genetic code, the sperm, will be the main focus of the physiology, but first we must look at the anatomy of the male reproductive system and the function of each organ. The male reproductive system has only one function, and all the organs of this system function together to complete this one task. This task is to produce the male half of the genetic code and deliver it into the female.
Slide 3-

Scrotum – Sac that holds testes. Testes – Male reproductive organs that actually perform spermatogenesis. Epididymis – tube where spermatozoa mature: 4 to 5 meters long. Male anatomy terms:
Slide 4-

Vas deferens – storage area for sperm from a few hours to 42 days. No loss of fertility during storage. Seminal vesicle –secretes a slightly alkaline mucus which contains fructose (food source for the sperm) and prostaglandin (a hormone that produces uterine contractions).
Slide 5-

Ejaculatory duct – area where vas deferens and seminal vesicles empty during ejaculation. Prostate gland – where the ejaculatory duct passes through and meets the urethra. Contracts during ejaculation to empty secretions to the mix. Highly alkaline, mucus secretion.
Slide 6-

Urethra – common tube from bladder and reproductive organs. Carries ejaculate out of the body. Bulbourethral gland (Cowper’s gland) – secretes a viscid, alkaline secretion that cleanses urethra and lubricates penis.
Slide 7-

Penis – organ of ejaculate delivery. The shaft of the penis is composed of two types of “erectile tissue” called the corpus cavernosa and the corpus spongiosum. The corpus spongiosum enlarges at the distal end to form the glans penis.
Slide 8-

Semen – fluid ejaculated during the male sexual act. Contains about 120 million sperm/ml and 1 to 5ml are usually ejaculated per sexual act. It is a milky white, viscid fluid that is composed of sperm, and the secretions from the seminal vesicles, Prostate gland, and the bulbourethral glands. Its pH = 7.5. This pH allows the acid secretions of the vagina to be neutralized (pH of the vagina is between 3 and 4) to allow the sperm to exist at a pH of 6-6.5, which is the pH at which they are most mobile. So semen is sperm with food, acid neutralizers, and uterine contraction producers.
Slide 9-

Seminiferous tubules – tubes in testes where sperm are formed and begin maturation. Vas deferens testis epididymis Cross section Seminiferous tubule spermatogenesis
Slide 10-

The process of spermatogenesis is as follows:
Slide 11-

Spermatogonium – divides by mitosis. One daughter cell goes on to become a primary spermatocyte, the other divides again to form another spermatogonium and another primary spermatocyte, etc., etc. Sperm Spermatid Secondary spermatocyte Primary spermatocyte Chromosomes replicated
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Spermatogonium Spermatid – immature sperm Spermatozoa – mature sperm cells Primary spermatocyte Secondary spermatocyte
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Meiosis I – the DNA was replicated, then is reduced. Meiosis II – DNA is reduced a second time. Mitosis
Slide 14-

The process of division with chromosomal reduction is called meiosis. This process helps to reduce the normal complement of 23 pairs or 46 chromosomes to a simple complement of 23 chromosomes (diploid to haploid). This process of development takes about 74 days. The process also must occur at a body temperature about 3 to 5 degrees below that of normal body temperature. This is why the testes are located external to the body. Normal sperm production will produce about 120 million sperm per ml of semen. If the number drops below 20 million then functional infertility has occurred.
Slide 15-

Factors that can dramatically reduce sperm production: High temperature Alcohol – excessive X- Rays and chemotherapy Drugs – of various types
Slide 16-

A controversial question facing today’s new parents: 1. To remove the prepuce (often called the foreskin of the penis) of a male. Should baby boys be circumcised? 2. To remove all or part of the clitoris, prepuce (often called the hood of the clitoris), and/or labia of a female. Circumcise
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