Intermediate Anal Canal Quiz

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

• Hindgut
• Foregut
• Midgut
• Neural tube

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

• Allantois
• Mesonephric duct
• Proctodeum
• Hindgut endoderm