Page 70 - 86 human physiology part-2

The Male Reproductive System

Voluntary and involuntary contraction.
Contraction by wrinkling to decrease surface
Layer of smooth muscular fiber area available for heat loss to testicles, or
Dartos muscle outside the external spermatic expansion to increase surface area available to
fascia but below the skin promote heat loss; also helps raise and lower
scrotum to help regulate temperature
Part of the testes and connect the
Efferent ductules Ducts for sperm to get to epididymis
rete testis with the epididymis
Begins at the vas deferens, passes
Ejaculatory ducts through the prostate, and empties Causes reflex for ejaculation. During
ejaculation, semen passes through the ducts and
(2) into the urethra at the Colliculus exits the body via the penis.
seminalis.
Tightly coiled duct lying just
Epididymis outside each testis connecting Storage and maturation of sperm.
efferent ducts to vas deferens.
Three columns of erectile tissue:
two corpora cavernosa and one Male reproductive organ and also male organ of
Penis
corpus spongiosum. Urethra passes urination.
through penis.
Surrounds the urethra just below Stores and secretes a clear, slightly alkaline
Prostate gland the urinary bladder and can be felt fluid constituting up to one-third of the volume
during a rectal exam. of semen. Raise vaginal pH.(25-30% of semen)
Pouch of skin and muscle that Regulates temperature at slightly below body
Scrotum
holds testicles. temperature.
Usually white but can be yellow, Components are sperm, and "seminal plasma".
gray or pink (blood stained). After
Semen ejaculation, semen first goes Seminal plasma is produced by contributions
through a clotting process and then from the seminal vesicle, prostate, and
bulbourethral glands.
becomes more liquid.
About 65-75% of the seminal fluid in humans
originates from the seminal vesicles. Contain
Convoluted structure attached to proteins, enzymes, fructose, mucus, vitamin C,
Seminal vesicles vas deferens near the base of the flavins, phosphorylcholine and prostaglandins.
(2)
urinary bladder. High fructose concentrations provide nutrient
energy for the spermatozoa as they travel
through the female reproductive system.
Long coiled structure contained in
Seminiferous the chambers of the testis; joins Meiosis takes place here, creation of gametes
tubules (2) (sperm).
with vas deferens.
Junctions of the Sertoli cells form Cells responsible for nurturing and
the blood-testis barrier, a structure development of sperm cells , provides both
that partitions the interstitial blood
Sertoli cells secretory and structural support; activated by
compartment of the testis from the FSH. Also called "mother cells" or "nurse
adluminal compartment of the cells".
seminiferous tubules.
Testes Inside scrotum, outside of body. Gonads that produce sperm and male sex
hormones.Production of testosterone by cells of

Wikibooks | 285