Fig. 3.09. The wall of the arteriole. e - endothelium with pinocytotic vesicles, B - basal laminae, M - smooth muscle cell, C - collagen fibres and thin processes of fibrocytes in the tunica adventitia. Apart from the basal lamina, there is also elastin lamina in the widened cleft below the endothelium. A - astrocyte process containing gliofilaments. Scale = 200 nm. (Mouse, neocortex.) Download the high resolution image.