Transmission electron microscopy (TEM) of cuticle and muscle of Haemonchus contortus obtained from goats fed (a) control (polyphenol-free diet), (b) tzalam fodder, (c) quebracho drench or (d) sainfoin fodder. The illustrations include the longitudinal body ridge (lbd), cuticle (c), muscle cells (m), pseudocoele (ps). The main cellular lesions are electrolucent areas (EA), indicated by arrows in Figures 2c and 2d.