Vagina (females)
Proximal erectile bodies of the penis (males) and vulva (females)
Attachment of the scrotumpage 190
page 191Central perineal tendon (perineal body) (Same as female)
Located at midpoint of the line dividing the urogenital from anal triangles
Mass of collagenous and elastic fibers
Deep to skin
Anterior to anal canal
Posterior to bulb of the penis (male) or vestibule (female)
Site of attachment for
Bulbospongiosus
Superficial transverse perineal muscles
Deep transverse perineal muscles
External anal sphincter
Fascicles of muscle from external sphincter urethrae and levator aniPerineal membrane
Thin sheet of deep fascia
Runs between the two ischiopubic rami
Spans anterior pelvic outlet
Pierced by urethra and ducts of bulbourethral glands
Is attached to perineal body at midpoint of posterior margin
Thickened anterior margin = transverse perineal ligament
Superficial transverse perineal muscles
Lie superficial to (external to) perineal membrane
Extend from ischiopubic ramus on either side along posterior aspect of perineal membrane to attach to the perineal body
Deep transverse perineal muscles
Lie deep to (internal to) perineal membrane
Extend from ischiopubic ramus on either side along posterior aspect of perineal membrane to attach to the perineal body
Sphincter urethrae (external urethral sphincter)
Lies deep to (internal or superior to) perineal membrane
Circular fibers around membranous part of urethra in males
Anterior to deep transverse perineal muscles
Deep transverse perineal muscles and sphincter urethrae traditionally termed urogenital diaphragmFascia and spaces of the urogenital triangle
page 191
page 192
Superficial fascia of the urogenital triangle has two layers, similar to the abdomen
Superficial fatty layer
Deep membranous layer (Colles' fascia)
Superficial layer replaced in penis and scrotum by dartos layer (smooth or dartos muscle)
Membranous layer of superficial fascia
Posteriorly attached to posterior margin of perineal membrane and perineal body
Laterally attached to deep fascia (fascia lata) of superior medial thigh
Anteriorly is continuous with membranous layer of superficial fascia of abdomen (Scarpa's fascia)
Deep perineal fascia (Gallaudet's fascia)
Invests ischiocavernosus, bulbospongiosus, and superficial transverse perineal muscles
Fused to suspensory ligament of penis or clitoris
Superficial perineal space (pouch)
Between membranous layer of superficial fascia and perineal membrane
Contains in males:
Bulb and crura of penis and associated muscles
Proximal spongy urethra
Superficial transverse perineal muscles
Branches of internal pudendal vessels and pudendal nerves
Contains in females:
Crura of clitoris and associated muscles
Bulbs of vestibule and associated muscles
Superficial transverse perineal muscles
Branches of internal pudendal vessels and pudendal nerves
Greater vestibular glands
Deep perineal space (pouch)
Lies between perineal membrane and pelvic diaphragm
Ischioanal fossae extend anteriorly into this space
Contains:
Membranous urethra
External sphincter urethrae
Bulbourethral glands: secrete clear mucous during sexual excitation, ducts descend through perineal membrane and terminate in
spongy urethra
Deep transverse perineal muscles