Taken from guyton hall-Human Physiology and mechanisms of Disease Endothelial cell Vesicular channel ?? Plasmalemmal vesicles Basement membrane Intercellular cleft Figure 13-1 Structure of the capillary wall. Note especially the in- tercellular cleft at the junction between adjacent endothelial cells; it is believed that most water-salubl the capillary membrane along this cle substances diffuse through ole subTaken from Guyton & Hall – Human Physiology and Mechanisms of Disease