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ANT 3120: Chapter 28
Reproductive System - Anatomy
61
Anatomy
Undergraduate 1
01/25/2013

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Term
reproduction
Definition
process by which new individuals of a species are produced
Term
male reproductive system consists of
Definition
1) testes
2) scrotum
3) penis
4) ducts
5) accessory glands
Term
location of testes
Definition
located within the scrotum
Term
functions of testes
Definition
1) produce testosterone
2) produce sperm
Term
where does sperm production occur?
Definition
within the seminiferous tubules of the testes
Term
how many sperm mature per day?
Definition
rate of about 300-400 million sperm per day
Term
temperature of survival of sperm
Definition
at a temperature about 3 degrees below body temperature (production and survival)
Term
temperature of scrotum is controlled by
Definition
cremaster muscle and testicular veins
Term
cremaster muscle (description)
Definition
continuation of the internal oblique
Term
function of the cremaster muscle
Definition
changes the location of the scrotum
Term
testicular veins (description)
Definition
cool arterial blood
Term
sperm consists of
Definition
1) head
2) midpiece
3) flagellum
Term
head contains
Definition
1) acrosome
2) DNA
3) enzymes (like hyaluronidase) that help sperm penetrate the egg
Term
midpiece contains
Definition
lots of mitochondria to power the flagellum
Term
function of flagellum
Definition
propels the sperm
Term
survival of sperm within female reproductive tract
Definition
about 48 hours
Term
when do the testes descend into the scrotum?
Definition
during the 7th month of fetal development
Term
testes originally develop as
Definition
retroperitoneal organs in the abdominopelvic cavity
Term
penis is composed of
Definition
erectile tissue
Term
erection results from
Definition
engorgement of the erectile tissue with blood
Term
ducts of male reproductive system
Definition
1) epididymis
2) vas deferens
3) ejaculatory duct
4) urethra
Term
epididymis (description)
Definition
site of final sperm maturation
Term
uncoiled epididymis length
Definition
20 feet in length
Term
length of vas deferens
Definition
18 inches long
Term
function of vas deferens during ejaculation
Definition
propels sperm into urethra (via ejaculatory duct)
Term
location of storage of sperm
Definition
vas deferens; can store sperm for several months; sperm that are not ejaculated are reabsorbed
Term
vasectomy
Definition
medical procedure in which the vas deferens is cut; close to 100% effective
Term
length of ejaculatory ducts
Definition
2 cm long
Term
function of ejaculatory ducts
Definition
ejects sperm into the urethra
Term
formation of ejaculatory ducts
Definition
by union of seminal vesicle and ampulla of a vas deferens
Term
urethra consists of
Definition
1) prostatic urethra
2) membranous urethra
3) penile (spongy) urethra
Term
function of urethra
Definition
carries both urine and semen out of the penis
Term
accessory glands of male reproductive system
Definition
1) seminal vesicles
2) prostate gland
3) bulbourethral glands
Term
location of seminal vesicles
Definition
posterior to the bladder
Term
function of seminal vesicles
Definition
secretes an alkaline fluid which contains fructose and prostaglandins
Term
alkaline portion of seminal vesicle secretion (function)
Definition
helps neutralize acidic environment of the female reproductive tract
Term
fructose portion of seminal vesicle secretion (function)
Definition
produces ATP
Term
prostaglandin portion of seminal vesicle secretion (function)
Definition
causes contraction of uterus and fallopian tubes (aids in sperm motility)
Term
location of prostate gland
Definition
inferior to bladder
Term
secretion of prostate gland (function)
Definition
~25% of semen; helps with sperm mobility and viability
Term
location of bulbourethral glands
Definition
located near the membranous urethra
Term
secretion of bulbourethral glands (function)
Definition
lubricates the end of the penis and neutralizes acidic urine in the urethra
Term
semen (description)
Definition
mixture of sperm and accessory gland secretions
Term
semen below 20 million sperm per mL
Definition
chance of being infertile
Term
semen usually contains
Definition
between 50-150 million sperm per mL
Term
reasons for large number of sperm
Definition
1) very few actually make it to the egg
2) need more than one to help break down barrier of egg
Term
female reproductive system consists of
Definition
1) ovaries
2) uterine tubes
3) uterus
4) vagina
5) external genitalia
6) mammary glands
Term
function of ovaries
Definition
produce oocytes
Term
where are oocytes contained?
Definition
within follicles
Term
how many follicles fully develop each month?
Definition
one
Term
uterine tubes (fallopian)
Definition
also called oviducts; transport eggs from ovaries to uterus
Term
major structures of uterine tubes
Definition
1) infundibulum
2) fimbriae
3) ampulla
4) isthmus
Term
oocytes must be carried through the uterine tubes by way of
Definition
1) peristaltic contractions of the smooth muscle lining of the uterine tubes
2) cilia of the epithelial lining of the uterine tubes
Term
major structures of uterus
Definition
1) fundus
2) body
3) cervix
4) endometrium
Term
fundus
Definition
portion located above entrance of uterine tubes
Term
body
Definition
central position; majority of uterus
Term
cervix
Definition
portion which opens into the vagina
Term
endometrium
Definition
inner lining of the uterus that is shed during menstruation
Term
vagina (description)
Definition
passageway for menstrual flow, childbirth, and intercourse
Term
vagina is lined with
Definition
stratified squamous epithelium
Term
vagina is very
Definition
acidic; helps reduce the growth of bacteria/harmful to sperm
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