Medium-Sized artery: muscular arter Endothelium Tunica intima 3 Subendothelial layer: LCT Internal elastin lamina: clear Tunica media: contain 10-40 layers of circular smooth muscle External elastic lamina Tunica adventitia LCT: contain vasa vasorumMedium-sized artery: ▪ muscular artery Tunica intima Endothelium Subendothelial layer: LCT Internal elastic lamina: clear Tunica media: contain 10~40 layers of circular smooth muscle Tunica adventitia External elastic lamina LCT: contain vasa vasorum