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🎯 Anatomy of Pelvic Organs

Based on TeLinde's Operative Gynecology

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Slide 1 — Introduction & Clinical Relevance

• Precise knowledge of pelvic anatomy is the cornerstone of safe gynecologic surgery
• The pelvis contains organs of the urinary, reproductive, and gastrointestinal systems — all in close proximity
• Surgical errors (ureteric injury, bladder entry, rectal injury) arise directly from failure to appreciate these relationships
• TeLinde's approach: anatomy as it is encountered during surgery, not just descriptively

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Slide 2 — Bony Pelvis

• True pelvis (below pelvic inlet) — contains the pelvic organs
• False pelvis (above inlet) — contains bowel loops

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Slide 3 — Pelvic Floor

Muscles of the Pelvic Floor (Levator Ani Group)

• Covered by endopelvic fascia
• Lateral thickening = Arcus Tendineus Fascia Pelvis (ATFP) — lies medial to obturator internus; critical landmark for anti-prolapse sutures (Bailey & Love, p. 1507)
• The pelvic floor muscles support all three compartments: bladder/urethra (anterior), uterus/vagina (middle), rectum (posterior)

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Slide 4 — Pelvic Peritoneum & Pouches

• Peritoneum drapes over pelvic organs, forming important surgical landmarks

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Slide 5 — Uterus

Anatomy

• Position: Anteverted, anteflexed (normal); retroversion in ~20% of women
• Size: ~7.5 × 5 × 2.5 cm (nulliparous); larger after pregnancies
• Parts: Fundus → Body → Isthmus → Cervix (supravaginal + vaginal portions)

Layers

Blood Supply

• Uterine artery (from internal iliac) — crosses ureter 1.5–2 cm lateral to cervix ("water under the bridge")
• Anastomoses with ovarian artery superiorly
• Venous drainage: Uterine venous plexus → internal iliac veins

Ligamentous Supports

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Slide 6 — Fallopian Tubes & Ovaries

Fallopian Tube

• Parts: Interstitial → Isthmus → Ampulla → Infundibulum (with fimbriae)
• Ampulla = most common site of ectopic pregnancy and fertilization
• Blood supply: branches of uterine and ovarian arteries in the mesosalpinx

Ovary

• Attachments: Suspensory (IP) ligament superiorly, ovarian (utero-ovarian) ligament medially, mesovarium
• Blood supply: Ovarian artery (directly from aorta at L2)
• Venous drainage: Right ovarian vein → IVC; Left → left renal vein
• Surgical note: IP ligament must be clamped high to avoid ureteric injury during oophorectomy

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Slide 7 — Urinary Bladder & Urethra

Bladder

• Lies posterior to pubic symphysis, anterior to uterus and vagina
• Detrusor muscle: three layers of smooth muscle
• Trigone: between two ureteric orifices and internal urethral meatus — landmark for cystoscopy
• Pubovesical/pubourethral ligaments: anterior supports of bladder neck

Urethra

• Female urethra: 3.5–5 cm long
• Passes through urogenital diaphragm, opens at external urethral meatus anterior to vaginal introitus
• Supported by pubourethral ligaments and pelvic floor (pubococcygeus)

Surgical Vulnerability

• Bladder injury most common during entry into vesicouterine space in hysterectomy
• Urethral injury rare but occurs in anterior colporrhaphy

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Slide 8 — Ureter

"The ureter is the most important structure in gynecologic surgery" — TeLinde's

Course

1. Abdominal ureter: Descends over psoas, crosses pelvic brim at bifurcation of common iliac
2. Pelvic ureter: Enters pelvis crossing external/internal iliac vessels → runs in medial leaf of broad ligament
3. Critical point: Passes 1.5–2 cm lateral to the cervix, under the uterine artery
4. Passes near vaginal fornix, then enters trigone of bladder

Danger Zones in Surgery

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Slide 9 — Rectum & Sigmoid Colon

• Rectum: ~12–15 cm; begins at S3, ends at anorectal junction
• Lies posterior to uterus/vagina, anterior to sacrum
• Rectovaginal septum (Denonvilliers' fascia): thin fascial plane between posterior vaginal wall and rectum
• Posterior to the rectum: pararectal space → important for rectal mobilization in radical hysterectomy

Surgical Relevance

• Entry into rectovaginal space is essential for posterior colporrhaphy and sacrocolpopexy
• Rectal injury most common at rectouterine pouch in cases of endometriosis/adhesions

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Slide 10 — Retroperitoneal Spaces

• Pararectal space: floor = levator ani, roof = posterior leaf of broad ligament, cranial border = uterine artery (Bailey & Love, p. 1598)

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Slide 11 — Vascular Anatomy

Internal Iliac Artery (Hypogastric)

• Anterior division supplies pelvic organs:
  • Uterine artery
  • Vaginal artery
  • Internal pudendal artery
  • Obturator artery
  • Inferior vesical artery
• Posterior division: iliolumbar, lateral sacral, superior gluteal (exits pelvis)

Key Points

• Internal iliac artery ligation (bilateral): used to control catastrophic pelvic hemorrhage
• Ovarian arteries arise directly from aorta (L1–L2 level)

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Slide 12 — Pelvic Lymphatics

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Slide 13 — Pelvic Nerve Supply

• Uterosacral ligaments carry autonomic nerves → nerve-sparing radical hysterectomy preserves bladder function

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Slide 14 — Key Images

Sagittal View of Female Pelvis

Pelvic Floor — Levator Ani

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Slide 15 — Summary: Surgical Danger Zones

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Slide 16 — Key Takeaways

1. The ureter is the most surgically critical structure — always identify before clamping
2. Uterine artery crosses the ureter 1.5–2 cm lateral to cervix ("water under the bridge")
3. Cardinal and uterosacral ligaments are primary supports against uterine prolapse
4. Retroperitoneal spaces (paravesical, pararectal) are the safety corridors of radical pelvic surgery
5. Arcus tendineus fascia pelvis (ATFP) is the key lateral anchor for pelvic floor repair
6. Autonomic nerves in uterosacral ligaments must be preserved in nerve-sparing procedures

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Sources: TeLinde's Operative Gynecology (12th Ed.) | Bailey & Love's Short Practice of Surgery, 28th Ed. (pp. 1344, 1507, 1598)

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