perineum Flashcards
location of perineum
inferior to the pelvic diaphragm and is bounded by the pelvic outlet
boundaries of perineum include
anteriorly : pubic symphysis posteriorly : coccyx lateral : ischial tuberosities anterolateral : schiopubic ramus posterolateral : sacrotuberous ligament
division of perineum
divide into two by line connected between the tuberosities making anterior urogenital triangle and posterior anal triangle
contents of anterior urogenital triangle
bladder internal genitalia urethra
contents of posterior anal triangle
rectum anus coccyx
tunnel found in the obturator internus fascia located on the lateral wall of the ischiorectal fossa
pudendal canal
wedge shaped fat filled space situated on each side of anal canal
ischioanal fossa
medial to ischial tuberosities
ischioanal fossa
contents of pudendal canal include
pudendal nerve internal pudendal vessels
pudendal nerve arises from
ventral rami of S2, S3 & S4
principal nerve supply to the perineum
pudendal nerve
branches of pudendal nerve
inferior rectal nerve
perineal nerve
dorsal nerve of penis or clitoris
inferior rectal nerve supplies
external anal sphincter and anal skin
perineal nerve supplies
muscles of the urogenital triangle and scortum or labia majora
dorsal nerve of penis or clitoris
supplies the body prepuce & glans of penis or clitoris
internal pudendal artery arises from
the anterior division of the internal iliac artery
principal arterial supply of the perineum
internal pudendal artery
branches of internal pedundal artery
inferior rectal artery perineal artery artery of the bulb of the penis or clitoris deep artery of the penis or clitoris dorsal artery of penis or clitoris
blood supply to the skin & muscle of lower anal canal
inferior rectal artery
blood supply to the perineal body & scrotum
perineal artery
superficial fascia of urogenital triangle is divided into
- fatty layer and membraneous layer
fatty layer of urogenital triangle
fascia of camper
membraneous layer of urogenital triangle
colles fascia
muscles that form the urogenital diaphragm
sphincter urethrae and deep transverse perineal
location of the muscles of the urogenital diaphragm
enclosed between a superior and an inferior layer of fascia of the urogenital diaphragm(perineal membrane)
laterally the layers of fascia are attached to the
pubic arch
It is a fibromuscular mass located below the pelvic diaphragm between the anal canal & bulb of the penis or vagina
perineal body
innervation of perineum
somatic nerves Pudendal Ilioinguinal Genitofemoral Posterior femoral cutaneous.
visceral nerve of the perineum
- postganglionic sympathetic fibers along the pudendal
nerve - inferior hypogastric plexus
- via pelvic splanchnic nerves from spinal cord levels of
S2 to S4
bloody supply the perineum
internal pedundal artery
inferior rectal artery
perineal artery
superficial and deep branches of the external artery
branches of the internal pedundal artery
- artery of bulb of penis
- urethral artery
- two terminal branches
deep artery of penis & dorsal artery of penis
branches of the perineal artery
- transverse perineal branch
- posterior scrotal
venous drainage of perineum
deep dorsal vein of the penis goes to prostatic venous plexus
superficial dorsal vein goes to superficial external pudendal vein
