A 5-day-old male infant is diagnosed with anorectal agenesis. An ultrasound study reveals a rectourethral fistula. Which of the following is the most likely embryologic cause of this condition?

Anatomy

A 5-day-old male infant is diagnosed with anorectal agenesis. An ultrasound study reveals a rectourethral fistula. Which of the following is the most likely embryologic cause of this condition?

The action of digastric muscle is:

Which of the following vessels supply the anal canal?

All of the following muscles are elevators of the mandible EXCEPT: