<prompt> All of the following statements about Diploic veins are true, except?Develop around 8th week of gestationThese have no valves valvelessPresent in cranial bonesHave a thin wall lined by a single layer of endothelium  <response>: Diploic veins develop after bih and are not visible before 3 years of life. They fully develop only by 15 years of age. 