Tunica media: thickest layer ● smooth muscle:10-40 layers of, circularly e elastic F: produced by SM e collagenous F: produced by SM Tunica adventitia LCT -With small BV-vasa vasorum, nf and Lv ● externa| elastic M---Tunica media: thickest layer smooth muscle: 10-40 layers of, circularly elastic F: produced by SM collagenous F: produced by SM ---Tunica adventitia: LCT –with small BV-vasa vasorum, NF and LV external elastic M