Perineum and External Structures - Exam 3 Flashcards
perineum
diamond shape bounded by pubic symphysis, ischial tuberosity, and coccyx
urogenital triangle
muscles of the superficial perineal pouch (superficial transverse perineal, bulbospongiosus, ischiocavernosus)
bulbospongiosus males
surrounds bulb of penis (in root)
contracts during ejaculation (corpus spongiosum)
bulbospongiosus females
surrounds bulbs of vestibule
ischocavernosus males
surrounds crus of penis (corpus cavernous)
helps maintain erection
ischiocavernosus females
surrounds crus of clit
muscles of deep perineal pouch
deep transverse perineal
external urethral sphincter
compressor urethrae
urethrovaginal sphincter
deep transverse perineal male vs female
male only, female have smooth muscle structure
perineal body
where the muscles of the perineum meet at perineal body
weakness here can contribute to prolapse
external male structures
root of penis
penis body
scrotum
testes
epididymis
root of penis
contains bulb and crus of penis
penis body
corona and glans (covered in foreskin if not circumcised)
contains corpus cavernous and corpus spongiosum
corpus cavernosum and corpus spongiosum
spongiosum contains urethra
fill with blood during arousal
*spongiosum fills less to keep urethra patent
scrotum
contains testes
has cremaster muscle and detrusor muscle
cremaster muscle
pulls scrotum towards pelvis
detrusor muscle (male external structures)
wrinkles skin of scrotum to retain heat
testes
divided into lobes by septa
filled with seminiferous tubules
epididymis
leads to vas deferens
has head body and tail regions
external female structures
labia majora minora
clitoris (and glands)
prepuce (foreskin) of clitoris
vestibule
vestibule
area within labia minora
external urethral orifice and vaginal opening
anal triangle muscle
external anal sphincter
