Download - Pelvic diaphragm, urogenital diaphragm and perineum Sanjaya Adikari Department of Anatomy
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Pelvic diaphragm,
urogenital diaphragm and
perineum
Sanjaya AdikariDepartment of Anatomy
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Describe/draw
• Pelvic diaphragm/floor
• Urogenital and anal triangles
• Urogenital diaphragm
• Deep perineal pouch & contents
• Superficial perineal pouch &
contents
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Pelvic diaphragm/Floor
• Consists of
– Levator ani
– Coccygeus
– Superior and inferior pelvic fascia
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Pelvic diaphragm
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Obturator fascia
IschiococcygeusIliococcygeusPubococcygeus
Pelvic diaphragm…
Levator ani Coccygeus
White line(tendinous arch)
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Puborectalis
Pubovaginalis
Urogenital hiatus
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PubovaginalisLevator prostatae
Anococcygeal raphe
Anorectal junction
Puborectalis
Puborectalis, pubovaginalis, levator prostatae
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Levator prostatae
Puboprostatic ligaments
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Urogenital triangle
Anal triangle
Coccyx
subpubic angle
Ischiopubic ramus
Sacrotuberous ligament
Anterior end of ischial tuberosity
Perineum
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Perineal triangles
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Sacrotuberous ligament
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Perineal body
Perineal body/central perineal tendon
Pubis
Fibromuscular mass to which pelvic diaphragm and perineal muscles are attached
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Deep perineal pouch
Perineal membrane/inferior fascia UD
Perineal body/central perineal tendon
External Sphincter
Prostate
Urogenital diaphragm
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Urogenital diaphragm
• Consists of
– Superior fascia (blends with inferior pelvic
fascia)
– Inferior fascia (perineal membrane)
– Sphincter urethrae muscle
– Deep transverse perineal muscles
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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
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Deep transverse perineal muscles
Bulbourethral glands
Deep perineal pouch
Sphincter urethrae
Vessels and nerves
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Membranous layer of superficial fascia of abdomen/ fascia Scarpa
Superficial perineal pouch
Superficial perineal fascia/Colles
Superficial perineal pouchCorona of glans penis
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Attachment of superficial perineal fascia
Perineal membrane
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Superficial perineal pouch…. Cont.
superficial perineal fascia
superficial transverseperineal muscle
bulbospongiosus
ischioanalfossa
ischiocavernosus
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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
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Root
Body
Glans
Bulb
Crus
Corpus spongiosum
Corpus cavernosum
Bulbospongiosus
Ischiocavernosus
Parts of the penis & muscle attachments
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Anal canal
Levator ani
External anal sphincter
Tube within a funnel
External anal sphincter
skeletal muscle
Internal anal sphincter
smooth muscle
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Ischioanal (ischiorectal) fossa
Ischial tuberosity
Obturator internus and fascia
Skin
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External anal sphincter
Deep
Superficial
Subcutaneous
Anococcygeal body
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Nerve to obturator internus
Internal pudendal artery
Pudendal nerve
Sacrospinous ligament
Ischial spine
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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