All of the following statements about Diploic veins are true except: (A) Develop around 8th wks of gestation, (B) These have no valves, (C) Present in cranial bones, (D) Have a thin wall lined by single layer of endothelium
Answer is A. Diploic veins form sinuses in cancellous tissue between laminae of cranial bones.The skull is unilamellar at bih without any dipole. The diploic veins sta to develop at around 2 years of age along it diploe.These veins are lined by endothelium suppoed by some elastic tissue and are valveless.Reference"Chaurasia&;s human anatomy vol 3 ,4th edition, page no.96