AN48.1-8 | Pelvic wall and viscera — Gate Quiz

Correct. The uterine artery crosses over the ureter 2 cm lateral to the cervix, within the base of the broad ligament — the "water under the bridge" relationship. The ureter passes below the uterine artery at this point and is at greatest risk of injury during hysterectomy.

The classic relationship: uterine artery (bridge) crosses over the ureter (water) 2 cm lateral to the cervix. Remembering this prevents the most common intraoperative complication of gynaecological surgery — ureteric ligation or transection.

Correct. When the bladder distends, it rises above the pubic symphysis and lifts the peritoneal reflection away from its anterior surface. This creates an extraperitoneal zone anterosuperior to the pubic symphysis through which a trocar can safely enter the bladder without entering the peritoneal cavity.

The anterior surface of the empty bladder has peritoneum reflected at a higher level. When full, the bladder ascends and further strips the peritoneum upward — enlarging the safe extraperitoneal window. This is why the procedure is called suprapubic cystostomy and not a peritoneal procedure.

Correct. Ligation of the ureter at the point where the uterine artery crosses it (2 cm lateral to the cervix) causes ureteric obstruction → hydronephrosis and hydroureter. The classic presentation is loin pain, ipsilateral hydronephrosis, and eventually fever (obstructive pyelonephritis). IVP or CT urogram confirms the diagnosis.

Ureteric injury is the most feared complication of hysterectomy. The ureter can be ligated, kinked, or transected at the base of the broad ligament where the uterine artery crosses over it. Postoperative loin pain + ipsilateral hydronephrosis on imaging = ureteric obstruction until proven otherwise.

Correct. The ovarian arteries arise directly from the abdominal aorta at the level of L2 (same as the testicular arteries — both are gonadal vessels arising at the level where the gonads originally develop). They descend retroperitoneally and enter the pelvis via the suspensory (infundibulopelvic) ligament of the ovary.

The ovarian artery is a direct branch of the aorta at L2 — the same origin as the testicular artery, because both gonads develop at the same level and drag their blood supply downward during descent. Lymphatics also drain to para-aortic nodes at L2 — not inguinal nodes.

Correct. A T10 complete spinal cord lesion is above the sacral cord (S2–S4). The sacral reflex arc is intact but disconnected from supraspinal inhibition. Filling triggers uninhibited detrusor contractions → automatic/reflex voiding in small volumes without warning. This is the spastic/automatic bladder.

Supra-sacral complete lesion (above S2) = automatic bladder: spastic, small capacity, uninhibited contractions, reflex voiding. Sacral/infrasacral lesion (S2–S4, cauda equina) = autonomous bladder: atonic, large capacity, overflow incontinence. T10 is well above the sacral level.

Correct. The pouch of Douglas (rectouterine pouch) is the most dependent part of the peritoneal cavity. Free blood from a ruptured ectopic pregnancy pools here — directly posterior to the posterior vaginal fornix. Extreme tenderness (cervical excitation) and a "boggy" fullness on palpation of the posterior fornix = haemoperitoneum in the pouch of Douglas = ruptured ectopic until proven otherwise.

Posterior fornix tenderness (cervical excitation) in a haemodynamically unstable woman with amenorrhoea = ruptured ectopic pregnancy until proven otherwise. Blood from the ruptured tube fills the rectouterine pouch of Douglas — which lies immediately posterior to the posterior vaginal fornix, accessible on vaginal examination.

Correct. Internal haemorrhoids develop above the pectinate (dentate) line, where the mucosa is innervated by autonomic (visceral afferent) nerves via the inferior hypogastric plexus. Visceral sensation transmits distension, pressure, and burning — but NOT sharp pain. External haemorrhoids (below the pectinate line) are covered by perianal skin innervated by the inferior rectal nerve (somatic, S2–S4) — acutely painful.

The pectinate line is the key landmark for pain sensation in the anal canal. Above = visceral innervation (autonomic) = no sharp pain (internal haemorrhoids are painless unless thrombosed). Below = somatic innervation (inferior rectal nerve, S2–S4) = painful (external haemorrhoids).

Correct. Batson's vertebral venous plexus is a valveless, low-pressure, bidirectional venous network connecting the pelvic veins (draining the prostate) with the vertebral veins. Increased intra-abdominal pressure (coughing, straining) reverses flow and seeds tumour cells directly into vertebral bone marrow — explaining why prostate cancer metastasises preferentially to the lumbar vertebrae and pelvis.

Batson's plexus is the key: a valveless vertebral venous network that connects directly with pelvic venous drainage. Increased intra-abdominal pressure can reverse flow, seeding prostate cancer cells retrograde into vertebral bone marrow without passing through the liver or lungs. This explains osteoblastic vertebral metastases.

Correct. The nerve to levator ani (S3, S4) supplies the levator ani muscle — the primary support of the pelvic floor and viscera. Injury during prolonged or obstructed labour denervates the levator ani → pelvic floor weakness → uterine prolapse, cystocoele, rectocoele, and both urinary and faecal incontinence. This is a significant cause of pelvic floor dysfunction in multiparous Indian women.

Levator ani is the muscular floor of the pelvis. Its denervation (nerve to levator ani, S3–S4) directly causes pelvic floor weakness → prolapse of pelvic organs, urinary incontinence, and faecal incontinence. This is an important long-term consequence of childbirth injury.

Correct. The superior gluteal artery is the only branch of the posterior division of the internal iliac artery that exits via the greater sciatic foramen ABOVE the piriformis. The posterior division gives: iliolumbar, lateral sacral, and superior gluteal arteries — all going upward/backward toward the posterior pelvic wall and gluteal region.

The posterior division of the internal iliac gives: iliolumbar + lateral sacral + superior gluteal (all go posteriorly/superiorly). The anterior division gives everything else — obturator, inferior gluteal, superior/inferior vesical, uterine, vaginal, internal pudendal, middle rectal. The 'POSTerior = POST-erior gluteal only' mnemonic doesn't work — remember: Superior gluteal + iliolumbar + lateral sacral = posterior division.