ANAT20006 Lecture Notes - Lecture 35: Urogenital Triangle, Pelvic Floor, Fecal Incontinence
12 Jun 2018
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LECTURE 35
MALE REPRODUCTIVE SYSTEM
PELVIC DIAPHRAGM
•(1) Separates pelvis and
perineum (area between
thighs below pelvic
diaphragm, it is an
area not a
structure).
•(2) Formed largely
by the levator ani
muscle. It contains
the opening for
pelvic viscera. Has
3 parts in both
males & females.
•Urogenital triangle
includes urogenital
hiatus. The anal triangle includes
the anal aperture (opening for
rectum).
•(3) Levator ani is important for
fecal continence.
Lecture 35 - Monday 16 October 2017
ANAT20006 - HUMAN STRUCTURE & FUNCTION
PERINEAL MEMBRANE
•(4) Superficial to pelvic
diaphragm.
•Covers urogenital triangle
•Opening for urethra (male and
female) and vagina (female only).
DEEP PERINEAL POUCH
•(5) Space above perineal
membrane containing skeletal
muscle to form sphincters around
the urethra, glands and
neurovascular structures that
supply the penis.
TESTES
•(7) Divided into about 250 tubules by connective tissue septa. Each lobule has 3-10 seminiferous
tubules, which is where spermatogenesis takes place.
•Each tubule forms a highly convoluted loop within lobule
•Tubules end as straight tubule (tubulus erectus) at mediastinum.
•Connected to rete testis (anastomosing channel system)
Lecture 35 - Monday 16 October 2017
ANAT20006 - HUMAN STRUCTURE & FUNCTION
•(8) Capsule around testes has 2 parts: outer
is tunica vaginalis (extend of abdominal
peritoneum) and inner is tunica albuginea
(very dense connective tissue capsule, often
white (white = alba))
TESTICULAR DESCENT
•(9) Gonadal development occurs along
posterior abdominal wall.
•Important because they need a
temperature 2-3 degrees lower than
body temperature.
•
(10) Testes descend toward
inguinal canal by about 7 months,
then through the inguinal canal to
the scrotum just before birth. With
them they drag blood vessels,
nerves, a duct system (vas
deferens) and layers of abdominal
wall into scrotum.
Lecture 35 - Monday 16 October 2017
ANAT20006 - HUMAN STRUCTURE & FUNCTION
Document Summary
Pelvic diaphragm: (1) separates pelvis and perineum (area between thighs below pelvic diaphragm, it is an area not a structure), (2) formed largely by the levator ani muscle. 3 parts in both males & females: urogenital triangle includes urogenital hiatus. The anal triangle includes the anal aperture (opening for rectum): (3) levator ani is important for fecal continence. Perineal membrane: (4) superficial to pelvic diaphragm, covers urogenital triangle, opening for urethra (male and female) and vagina (female only). Deep perineal pouch: (5) space above perineal membrane containing skeletal muscle to form sphincters around the urethra, glands and neurovascular structures that supply the penis. Testes: (7) divided into about 250 tubules by connective tissue septa. Each lobule has 3-10 seminiferous tubules, which is where spermatogenesis takes place: each tubule forms a highly convoluted loop within lobule, tubules end as straight tubule (tubulus erectus) at mediastinum, connected to rete testis (anastomosing channel system)
