Lecture 22: Perineum Flashcards
superficial perineum
inferior, closer to the skin
the perineum
lies inferior to the pelvic floor, between lower limbs
deep perineum
superior, closer to pelvic
pelvic floor/ roof of perineum
formed by:
-levator ani
-coccygeus
-obturator internus
-piriformis
bones making up the border of the perineum
-ischiopubic ramus
-pubis symphysis
-ischial tuberosity
-coccyx/saccrum
triangles of the perineum
-urogenetial
-anal
urogenetial triangle
-anterior portion of perineum
urogenetial triangle is bounded by
-pubic symphysis
-ischial tuberosities
Anal triangle
-posterior portion of the perineum
anal triangle is bounded by
-coccyx
-ischial tiberosities
scrotum contains
-testes
-epididymis
-external spermatic cord
Body of penis is made up of
-glans
-corpus cavernosum
-corpus spongiosum
Glans
-extension of corpus spongosium
Corpus Cavernosum
-pair of erectile tissues, extension of crus
corpus spongiosum
-extension of bulb into the body of the penis
root of penis
crus & Bulb
crus
2 legs that surround bulb
bulb
single erectile cylinder
deep penile artery
penis contains 2 (one in each corpus cavernosum)
which part of the penis does penile urethra travel through
corpus spongiosum
names of urethra in males
- prostatic urethra
- Membranous urethra
- Spongy (penile) urethra
where does urethra exit
external urethral orifice
Pudenal cleft
space between labia majora and minora
borders of the vestibule
anterior - clitoris
posterior - Fourchette
lateral - labia minora
mons pubis
fatty tissue superior to vagina for coushin and covering
Labia Majora
outer lip for protection
Labia Minora
inner lip for protection and keeping lubrications in the vagina
vaginal orifice
opening of the vagina.
bulb of vestibule
part of the clitoris where blood accumulates during arousal
what is inferior ot the bulb of vestibule
greater vestibular glands
root of erectile tissue in women
-crus of clitoris
-greater vestibular glands
-bulb of vestibule
3 female muscles surrounding urethrain females
- External urethral sphincter
- Urethrovaginal sphincter
- compressor urethrae
external urethral sphincter
surrounds entire urethra
urethrovaginal sphincter
surrounds urethra and vagina
compressor urethrae
surrounds anterior urethra
urogenital triangle structures superficial to deep
- skin
- Perineal fascia
- Superficial perineal pouch
- Perineal membrane
- Deep perineal pouch
- Pelvic floor
deep perineal pouch
-underneath pelvic floor and above perineal membrane
-lies superior to perineal membrane
-forms the ext. urethral sphincter
deep perineal pouch for males
-deep transverse perineal muscle
-ext. urethral sphincter (surrounds membranous urethra for voluntary control)
Deep perineal pouch for females
same as males but also with:
-urethrovaginal sphincter
-cmpressor urethrae
Superficial perineal pouch
-between perineal membrane and deep perineal fascia
-lies inferior to the perineal mambrane
superior limit of superficial perineal pouch
perineal membrane
inferior limit of superficial perineal pouch
colles’ fasica
contents of superficial perineal pouch for males
-bulbospongiosis
-ischiocavernosus
-superficical transverse perineal muscle
bulbospongiosus males
-compresses bulb of penis during erection
-at root of penis
ischiocavernosus males
-compresses crus of penis during erection
-paired
contents of superficial perineal pouch for females
-bulbospongiosus
-ischiocavernosus
-siperficial transverse perineal muscle
Bulbospongiosus females
-compresses bulb of clitoris during an orgasam
Ischiocavernosus females
-compresses crus of cliitoris during an orgasam
Perineal fascia; superficial layer
continuous with Campers fascia of anterior abdominal wall
Perineal fascia: deep layer
-continuous with scarpas fascial of the anterior abdominal wall
-colles fascia
perineal body
convergence of:
-bulbospongiosus
-superficial/deep perineal muscles
-ext. anal sphincter
-pelvic floor msucles
anal triangle
-posterior portion of perineum
-bounded by : ischial tuberosities & coccyx
-NO perineal membrane
-1 layer
contents of anal triangle
-anal aperature
-ext. anal sphincter
-ischiorectal fossa
-pudendal canal
ischiorectal fossa borders
lateral: obturator internus
superior: levator ani
medial: ext. anal sphincter
inferior: perineal fascia
Pudendal canal
-pudendal nerve
-int. pudendal artery
-int .pudendal vein
Anal canal is made up of
-rectal ampulla -> anal canal
what surrounds and controls anal canal
external and internal anal sphincters
*external control internal
external anal sphincter
voluntary; compresses to keep sphincter shut
internal anal sphincter
involuntary; relaxed during normal defecation
where does abdominal aorta bifurcate
L4
path of BS to lower limb
abdominal aorta -> common iliac artert -> ext. iliac artery gives off internal iliac artery which gives off int. pudendal artery
Bs to perineum
internal pudendal artery
BS to rectum
IMA -> Superior rectal artery
Int. ilaic artery -> middle & inferior rectal arteries