Urinary Bladder

Question 1

Site: when empty

Answer 1

In lesser pelvis

Question 2

Site: when distended

Answer 2

1. It becomes a pelvi-abdominal organ
2. Strips anterior abdominal wall peritoneum and ascends to lower anterior part of abdomen

Question 3

Arterial supply

Answer 3

1. Superior vesical artery
2. Inferior vesical artery
3. Branches from Obturator artery

Question 4

Superior vesical artery

Answer 4

1. Arises from proximal patent part of umbilical artery of internal iliac artery
2. Supplies superior surface

Question 5

Inferior vesicle artery

Answer 5

1. Arises from anterior division of internal iliac artery
2. Supplies inferolateral surfaces in male
3. This surface is supplied by vaginal and uterine arteries in female

Question 6

Venous drainage

Answer 6

Vesical venous plexus (in fascia covering urinary bladder sides) which drains into internal iliac vein

Question 7

Lymph drainage

Answer 7

1. Upper parts: drain to external iliac lymph nodes
2. Lower parts: drain to internal iliac lymph nodes
3. Some vessels pass from neck to sacral lymph nodes

Question 8

Nerve supply: Parasympathetic

Answer 8

1. From S2, S3, S4 spinal segments along nervi erigentes (pelvic splanchnic nerve)
2. It contracts bladder wall and relaxes sphincter (empties bladder)

Question 9

Nerve supply: Sympathetic

Answer 9

1. From T10 to L2 spinal segments
2. It relaxes bladder wall and contracts sphincter

Question 10

Applied anatomy: Cystoscopy

Answer 10

Inside visualization of:
1. Urinary bladder
2. Mucous membrane
3. 2 ureteric orifices
4. Urethral meatus