Pelvic diaphragm,

urogenital diaphragm and

perineum

Sanjaya AdikariDepartment of Anatomy

Describe/draw

• Pelvic diaphragm/floor

• Urogenital and anal triangles

• Urogenital diaphragm

• Deep perineal pouch & contents

• Superficial perineal pouch &

contents

Pelvic diaphragm/Floor

• Consists of

– Levator ani

– Coccygeus

– Superior and inferior pelvic fascia

Pelvic diaphragm

Obturator fascia

IschiococcygeusIliococcygeusPubococcygeus

Pelvic diaphragm…

Levator ani Coccygeus

White line(tendinous arch)

Puborectalis

Pubovaginalis

Urogenital hiatus

PubovaginalisLevator prostatae

Anococcygeal raphe

Anorectal junction

Puborectalis

Puborectalis, pubovaginalis, levator prostatae

Levator prostatae

Puboprostatic ligaments

Urogenital triangle

Anal triangle

Coccyx

subpubic angle

Ischiopubic ramus

Sacrotuberous ligament

Anterior end of ischial tuberosity

Perineum

Perineal triangles

Sacrotuberous ligament

Perineal body

Perineal body/central perineal tendon

Pubis

Fibromuscular mass to which pelvic diaphragm and perineal muscles are attached

Deep perineal pouch

Perineal membrane/inferior fascia UD

Perineal body/central perineal tendon

External Sphincter

Prostate

Urogenital diaphragm

Urogenital diaphragm

• Consists of

– Superior fascia (blends with inferior pelvic

fascia)

– Inferior fascia (perineal membrane)

– Sphincter urethrae muscle

– Deep transverse perineal muscles

Deep perineal pouch• Space between the superior and inferior

fasciae of the urogenital diaphragm

• Contents– Membranous urethra

– Internal pudendal vessels

– Dorsal nerve of penis

– Perineal nerve

– Bulbourethral glands (Bartholin glands in superficial

pouch)

– Sphincter urethrae and deep transverse perineal muscles

Deep transverse perineal muscles

Bulbourethral glands

Deep perineal pouch

Sphincter urethrae

Vessels and nerves

Membranous layer of superficial fascia of abdomen/ fascia Scarpa

Superficial perineal pouch

Superficial perineal fascia/Colles

Superficial perineal pouchCorona of glans penis

Attachment of superficial perineal fascia

Perineal membrane

Superficial perineal pouch…. Cont.

superficial perineal fascia

superficial transverseperineal muscle

bulbospongiosus

ischioanalfossa

ischiocavernosus

Superficial perineal pouch

• Space between the superficial

perineal fascia and the perineal

membrane

• Contents– Bulbospongiosus muscle

– Ischiocavernosus muscle

– superficial transverse perineal muscles

– Root and the body of the penis

– testicles

Root

Body

Glans

Bulb

Crus

Corpus spongiosum

Corpus cavernosum

Bulbospongiosus

Ischiocavernosus

Parts of the penis & muscle attachments

Anal canal

Levator ani

External anal sphincter

Tube within a funnel

External anal sphincter

skeletal muscle

Internal anal sphincter

smooth muscle

Ischioanal (ischiorectal) fossa

Ischial tuberosity

Obturator internus and fascia

Skin

External anal sphincter

Deep

Superficial

Subcutaneous

Anococcygeal body

Nerve to obturator internus

Internal pudendal artery

Pudendal nerve

Sacrospinous ligament

Ischial spine

Penis

Deep p. pouch

Pudendal canal

Nerve to obturator internus

Internal pudendal artery

Pudendal nerve Inferior rectal nerve & artery

Dorsal nerve of penis

Perineal nerve

Dorsal artery of penis

Perineal artery

Deep artery of penis