II: Anatomy of Inguinal Canal Flashcards
sperm activation hypothesis
sperm production is more effective in cooler temperature but sperm is activated when it is in warmer conditions of female body
What are the three muscles of male inguinal region?
- Pyramidalis Muscle
- Cremaster m.
- Dartos m.
Innervation - pyramidalis m.
subcostal n.
innervation- cremaster m.
genital branch of genitofemoral n.
innervation- dartos m.
sympathetics running with ilioinguinal n. and post. scrotal n.
7 layers around the testicle out –> in
- superficial dartos fascia
- external spermatic fascia
- cremaster muscle and fascia
- internal spermatic fascia
- parietal tunica vaginalis
- visceral tunica vaginalis
- tunica albuginea
Between which layers is the epididymus located?
visceral and parietal tunica vaginalis
where are sperm formed?
seminiferous tubules
order of sperm leaving (7)
seminiferous tubules straight tubules rete testes efferent ductules epididymis ductus deferens urethra
where are sperm stored
epididymis
what are the 3 arches of inguinal canal formed by?
three abdominal muscle layers
- transversus abdominus
- internal oblique
- external oblique
deep ring
transversalis fascia
superficial ring
external oblique fascia
spermatic cord female equivalent
round ligament
what pulls the testes through the body wall?
gubernaculum
parietal peritoneum becomes X in spermatic cord
tunica vaginalis
does the parietal peritoneum get pushed through?
NO
transversalis fascia becomes X in spermatic cord
inner spermatic fascia
transversus abdominus becomes X in spermatic cord
NOTHING
- forms natural arch and is not pierced
internal oblique becomes X in spermatic cord
cremasteric muscle and fascia
external oblique becomes X in spermatic cord
external spermatic fascia
scarpa’s fascia becomes X in spermatic cord
dartos muscle and fascia
camper’s fascia becomes X in spermatic cord
NOTHING
no fat in scrotum
which muscle in the testes is the “puller”
cremasteric muscle
which muscle in the testes is the “wrinkler”
dartos muscle
define inguinal canal
oblique passageway in inguinal region through which the spermatic cord in male and round ligament in female traverse the ab. wall
thick muscular tube that carries sperm and semen located in the inguinal canal
ductus deferens
where does the testicular a. orginate?
aorta, just below renal a.
what oxygenates the cremasteric muscle?
cremasteric a.
where does the cremasteric a. originate?
inf. epigastric a.
what oxygenates the ductus deferens?
ductus deferens a.
where does the ductus deferens orginate?
inferior vesicular a.
what is the pampiniform plexus?
network formed by around 12 veins that converge superiorly as the left or right testicular v.
where does the right testicular v. drain? left?
right= inferior vena cava left= l. renal vein
what nerves are found in the inguinal canal?
- genital branch of the genitofemoral n.
- sympathetics accompany testicular a. and ductus deferens
- anterior cutaneous branches of iliohypogastric
- sympathetics running with ilioinguinal and posterior scrotal n. (**in canal, not cord!)
- parasympathetics from S2-4 on ductus deferens
anterior border of inguinal canal
aponeurosis of ext. oblique
floor of canal
inguinal ligament
medial floor of canal
lacunar lligament
posterior border of canal
transversalis fascia
posterior medial border of canal
conjoint tendon
where do the lymphatics of the testes drain to..
lumbar lymph nodes
Formation of the inguinal canal- when begin?
7th week
projection of parietal peritoneum called processus vaginalis begins to invaginate through boday wall next to gubernaculum
gubernaculum?
ligamentous-like primordia that attaches b/w developing testes/ovary and scrotal/labial folds
what does the gubernaculum become in women?
cranial: ovarian ligament
caudal: round ligament
do females have cremaster muscle?
yes
few short loops of muscle around the round ligament
where does the round ligament terminate?
labia majora
what is male equivalent of labia majora?
scrotum
Direct hernia
through hasselbach’s triangle
contained by external oblique or push through superficial ring
indirect hernia
through patent processus vaginalis, alongside spermatic cord
congenital hernia
indirect hernia, younger patients
femoral hernia
below inginal ligament wher fmeoral vessels push through
hasselbach’s triangle borders
- inferior epigastric vessels
- rectus abdominus
- inguinal ligament
hydrocele and hematocele
serous fluid or blood build up within the tunica vaginalis
spermatocele
cyst within the head of the pididymis
- may think they have cancer
cryptorchidism
failure of testes to descend (testes descend around 8m. gestation)
monochidism/polychidism
one testicle/more than 2 testicles
ectopic testes
lodged in the abdominal cavity somewhere
what is cut in vasectomy?
ductus deferens
- it is not tied afterwards