The penis contains the urethral opening, through which both urine and seminal fluids come out. The corpora cavernosa sits inside the body of the penis and consists of two tubes. Underneath is the corpus spongiosum which contains the urethral passageway. The scrotum contains the testes and the epididymis as well as the cremaster muscle. The septa divides the lobules where sperm are produced, and the efferent ductile convey the sperm into the epididymis (vas deferens). Spermatogenisis takes place via mitosis, meiosis, and spermiogenesis. Sperm are composed of a head with 23 chromosomes in the nucleus, a neck, and a tail (flagellum) that is powered by a large group of mitochondria in the neck of the sperm. This lecture also covers accessory glands, semen, and reproductive conditions and disorders.
External male genitalia structures: penis (crus/body/glans/prepuce) with corpora cavernosa and a corpus spongiosum, scrotum, and testes (or testicles)
The gubernaculums testis is a fibromuscular tract that gets male gonads out of the abdomen and into the scrotal sac prior to birth
Inside the scrotal sac are muscular layers, connective tissue, the epididymis (for storage of sperm), and the testes
Each testis has seminiferous tubules that are involved in spermatogenesis
Sperm contain a head (with nucleus and acrosome), a middle piece (with mitochondria), and a flagellum (or tail)
The vas deferens (or ductus deferens) takes sperm from the epididymis to meet up with glands that will add seminal fluids
The seminal vesicles contribute fructose, prostaglandins, fibrinogen, and alkaline secretions
The prostate gland, which encircles the urethra, adds prostatic fluid (seminalplasmin) and acidic secretions
The bulbo-urethral glands (or Cowper glands) add fluids to the urethra that help neutralize urinary acids and lubricate the end of the penis
Semen contains spermatozoa, seminal fluid, and enzymes
Male reproductive disorder/procedure examples: impotence, erectile dysfunction, prostate cancer, and vasectomy
Did you know…
Q: Is it possible to get a female pregnant without orgasm (ejaculating)?
A: Yes, it is possible. Prior to ejaculation it is common for a clear fluid to be seen coming out of the urethra orifice, it’s common name is “pre-cum”. Sperm can be found in this fluid. Though there are not nearly as many spermatozoa in this fluid as in the typical milky-looking ejaculate, it is an unwise method to engage in coitus interruptus (“pulling out”) if that’s your only means of birth control.
Male Reproductive System
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
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