خارجی ترین لایه رگمنابع• https://www.google.com/url?sa=i&url=https://www.researchgate.net/figure/Blood-vessel-anatomy-The-vessel-wall-is-made-up-of-three-layers-tunica-adventitia_fig1_278643651&psig=AOvVaw0iUQEd8yHrjnvhsbTgLXee&ust=1632373032499000&source=images&cd=vfe&ved=0CAkQjRxqFwoTCNjR6sjlkfMCFQAAAAAdAAAAABAD
