Intermediate Anal Canal Quiz

Q1. Which artery is the principal arterial supply to the anal canal above the pectinate line?

• Obturator artery
• Superior rectal artery
• Superior gluteal artery
• Inferior rectal artery

Q2. Which arteries principally supply the anal canal below the pectinate line?

• Inferior rectal arteries
• Superior rectal arteries
• Superior vesical arteries
• Uterine arteries

Q3. Venous blood from the upper anal canal can reach the portal venous system primarily through which vein?

• Femoral vein
• Inferior rectal vein
• Internal pudendal vein
• Superior rectal vein

Q4. Venous blood from the lower anal canal primarily enters which venous circulation?

• Pulmonary circulation
• Systemic venous circulation
• Coronary circulation
• Portal venous circulation only

Q5. Lymph from the anal canal above the pectinate line drains primarily toward which lymph nodes?

• Popliteal lymph nodes
• Internal iliac lymph nodes
• Axillary lymph nodes
• Superficial inguinal lymph nodes

Q6. Lymph from the anal canal below the pectinate line drains primarily to which lymph nodes?

• Deep cervical lymph nodes
• Para-aortic lymph nodes
• Internal iliac lymph nodes
• Superficial inguinal lymph nodes

Q7. Which type of innervation predominates in the anal canal above the pectinate line?

• Visceral innervation
• Special sensory innervation
• Somatic innervation only
• Branchial motor innervation

Q8. Which nerve provides important somatic sensory innervation to the anal canal below the pectinate line?

• Inferior rectal nerve
• Hypogastric nerve
• Pelvic splanchnic nerve
• Sacral splanchnic nerve

Q9. The upper anal canal above the pectinate line develops primarily from which embryological structure?

• Hindgut
• Midgut
• Neural tube
• Foregut

Q10. The lower anal canal below the pectinate line develops primarily from which embryological structure?

• Hindgut endoderm
• Allantois
• Mesonephric duct
• Proctodeum