Arteries of the pelvis

Question 1

Beginning of IIA

Answer 1

As 1 of 2 terimal branches of Common Iliac A at level of Lumbosacral disc

Question 2

Ending of IIA

Answer 2

ends opposite upper margin of greater sciatic foramen, by dividing into anterior & posterior division

Question 3

Anterior/ Inferior relation of IIA

Answer 3

Ureter

Question 4

Lateral relation of IIA

Answer 4

• External Iliac Vein
• Obturator Nerve

Question 5

Posterior/ superior relations of IIA

Answer 5

Internal Iliac vein

Question 6

Medial relation of IIA

Answer 6

Peritoneum

Question 7

Enumerate branches of Posterior division of IIA

Answer 7

all are parietal (wall of pelvis), SIT:
* Superior gluteal A
* Iliolumbar A
* Two Lateral sacral (sup & Inf)

Question 8

course & Distribution of Superior gluteal Artery

Answer 8

(considered continuation of post. division of IIA as it is the largest branch of IIA):
1. passes through greater sciatic foramen above piriformis muscle
2. enters gluteal region where it divides into deep & superficial branches

Question 9

Course & Distribution of Iliolumbar A

Answer 9

1. Ascends upwards in front of Sacro-iliac joint & deep to psoas major, to divide into:

Iliac branch:
* Anastomose around ASIS
* Anastomose with iliac branch of obturator N
* supply iliacus

Lumbar branch:
* anastomose with 4th lumbar A
* supply qauda equina
* supply psoas major
* supply quadratus lumborum

Question 10

Course of 2 lateral sacral A

Answer 10

each lateral sacral A (sup & Inf) divide into 2, so total = 4 Arteries (4 Rt, 4Lt):
* enter through anterior sacral foramina to supply sacral canal
* Exit through posterior sacral foramina to supply underlying muscles

Question 11

Enumerate branches of Anterior division of IIA

Answer 11

• Obturator A
• Inferior gluteal A
• Internal pudendal A
• umbilical/ Superior vesical A
• Middle rectal A
• Inferior vesical A
• Uterine A

Question 12

Course & distribution of Obturator Artery

Answer 12

passes through obturator canal along with obturator N, it gives:
* Iliac branches: Anastomose with Iliolumbar at ASIS
* Vesical branches; Supply urinary bladder
* Pubic branches: anastomose with pubic branches of Inferior epigastric A

Question 13

in 30 % of cases, obturator A doesnt exist, and is replaced by:

Answer 13

pubic branch of Inferior epigastric A

aka Abnormal obturator A