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what is the purpose of the male genitalia system?
to produce, nourish and transport mature sperm for reproduction
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what are the three cylindrical structures within the penile body?
the corpus spongiosum and corpora cavernosa
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what does the corpus spongiosum house?
the urethra
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the distal end of the corpus spongiosum is known as the
glans penis
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what are the three functions of the penis
- -pasageway for the ejaculation of semen
- -excretion of urine
- -sexual organ
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emission
the discharge of a small amount of semen before ejaculation, caused by contractions of the vas, seminal vesicles, ejaculatory ducts and prostate
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the cutaneous sac that lies below the pubic bone
scrotum
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raphe
the medium ridge that marks the separation of the hemiscrotums
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dartos muscle
contracts and wrinkles the skin of the scrotum and elevates the testis
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functions of the scrotum
houses and supports the testes, the lower portion of the spermatic cord, and epididymis; regulates tempurature
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approx measurements of the testes
5 cm long and 2.5 cm in diameter, left is lower than right
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forms a fibrous sac that encases the testis
tunica vaginalis
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tunica albuginea
a white, fibrous structure that covers the testis; divides the testis into 200-300 lobules containing seminiferous tubules
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tunica vasculosa
system of blood vessels that provide nourishment to the seminiferous tubules ant interstitial cells
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the functional unit of the testis and constitute approx 75% of testicular mass
seminiferous tubules
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spermatagonia
the most primitive form of germ cell, lies dormant until puberty
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spermatids
third phase of maturation of the sperm cell
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function of the testicles
production of sperm and testosterone
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comma or crescent shaped structure that is attatched to the posterior border of each testis
epididymis
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function of the epididymus
provides maturation, storage, and transportation of sperm through peristaltic contraction
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a firm cylindrical tube extending from the termination of the epididymis tot he ejaculatory duct near the base of the prostate
vas deferens
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the supporting structure of the male reproductive system that ascends out of the scrotum
spermatic cord
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what does the spermatic cord consist of?
the vas deferens, testicular artery, testicular vein, autonomic nerves, cremaster muscle and lymphatic vessels
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pouch like structure that lies posterior to the base of the bladder, fluid secretion constitutes about 60% of semen volume
seminal vesicles
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function of the seminal vesicles
secrete alkaline, viscous fluid that contains fructose, prostaglandins and clotting proteins. prostaglandins contribute to sperm motility and viability
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bulbourethral glands are also called
Cowper's glands
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function of the bulbourethral gland
lubricates the end of the penis and lining of the urethra, neutralizes acid from the urine in the urethra
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prostatic secretions make up about what percent of semen volume?
25%
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prostate function
secrete a milky, slightly acidic fluid that contributes to sperm motility and viability
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hormone produced in the pituitary gland that stimulates testosterone production
follicle stimulating hormone (fsh)
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hormone produced by the pituitary gland that contributes to testosterone production
luteinizing hormone (LH)
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cells in the seminiferous tubules that nurture maturing spermatids
sertoli cells
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an immature spermatozoon produced by meiotic division of a secondary spermatocyte
spermatid
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develops from spermatogonia cell in the seminiferous tubule and has 46 chromosomes
primary spermatocyte
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develops from mitotic division of a primary spermatocyte, has 23 chromosomes
secondary spermacyte
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process of maturation of a spermatogonia into a spermatozoon
spermiogenesis
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hormone produced by the testis that affects spermiogenesis and secondary male characteristics
testosterone
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