THE PLANNER
Summary
I
he Reproductive Organs Make, Deliver, and
Receive the Sex Cells 470
• As sh o w n , th e m ale rep ro d u ctiv e o rg an s include th e te s te s ,
sc ro tu m , e p id id y m is, d u c tu s (vas) d e fe re n s, p ro s ta te ,
se m in a l v e sic le s, b u lb o u re th ra l g la n d , and penis. S perm
are p ro d u ced in th e te s te s , m a tu re in th e epididym is, and
are sto re d in th e vas d e fe re n s. Upon e ja c u la tio n , sp e rm are
m ixed w ith se c re tio n s from th e p ro sta te , sem inal vesicles,
and b u lb o u reth ral gland, form ing a fluid called se m e n . Pel-
vic m uscle co n tra ctio n s forcefully expel th e se m e n th ro u g h
th e u reth ra of th e penis.
T h e m a le r e p r o d u c tiv e s y s te m • F ig u re 1 6 .1 a
Ductus (vas) deferens
Prostate
Penis
• S p e rm a to g e n e s is an d m ale se c o n d a ry sex ch aracte ristics
are m ain tain ed by se c re tio n s of GnRH from th e h y p o th ala-
m us, LH end FSH from th e a n te rio r pituitary, an d te s to s te r-
o n e a n d d ih y d ro te s to s te ro n e fro m tlie te H te s v is a neg ativ e
fe ed bacL m echanism .
T te f e m a lm r e p r o d u c tiv e s y s te m • F ig u re 1 6 .6
Infundibulum
Vagina
Uterine (fallopian) tubes
Ovaries
Uterus
Cervix
Mons
pubis
Labia
• As sh o w n , th e fem ale rep ro d u ctiv e o rg an s include th e o v a -
ries, u te rin e tu b e s , u te ru s , an d v a g in a. O o c y te s d ev elo p
w ithin follicles in th e ovaries an d a re relea se d into th e
u te rin e tu b e s. The u te ru s p ro te c ts an d n u rtu re s th e grow ing
em b ry o /fetu s. The v a g in a receiv es th e m ale's penis during
se x u a l in te rc o u rse and is th e p a ssa g e w a y th ro u g h w hich
th e b ab y will p a ss du rin g lab o r and delivery.
2
The Female Reproductive Cycle Shows That
Timing Is Everything 480
• O o g e n e sis, follicle d e v elo p m en t, ovulation, an d fem ale s e c -
o n d ary sex c h aracte ristics a re m aintained by se c re tio n s of
GnRH from th e h y p o th alam u s, LH an d FSH from th e a n te rio r
pituitary, an d e s tro g e n s an d p ro g e s te ro n e from th e ovaries
th ro u g h a n e g ativ e fe e d b a c k m echanism .
• In th e o v a ria n cy cle, follicles d ev elo p in th e ovary, as
show n . O ne follicle (or occasionally m ore) co m p le te s d ev el-
o p m e n t, releasin g a se c o n d a ry o o c y te from th e ovary a t
ovulation w h en stim u lated by a su rg e of LH an d FSH from
th e a n te rio r pituitary. The rem n a n ts of th e follicle rem ain in
th e ovary as th e c o rp u s lu te u m . If fertilization d o e s n o t tak e
place, th e co rp u s luteum d e g e n e ra te s w ithin
2
w eek s, an d a
new cycle begins.
D e v e lo p m e n t o f o v a ria n fo llic le s • F ig u re 1 6 .9
Degenerating^
corpus luteum
Corpus luteum
Ovarian
blood
vessels
Mature
(graafian)
follicle
Ruptured
follicle
Ovulation
504 CHAPTER 16
The Reproductive Systems
previous page 539 Craig Freudenrich, Gerard J  Tortora   Visualizing Anatomy and Physiology   2011 read online next page 541 Craig Freudenrich, Gerard J  Tortora   Visualizing Anatomy and Physiology   2011 read online Home Toggle text on/off