Figure 8: Electron micrograph the acinar cells of Cowper's gland during the breeding period showing short and thick microvilli (Mv) on the apical surface. Electron-dense secretory granules (Sg) are seen below the apical plasma membrane releasing their content into the lumen (L). Apical cytoplasmic blebs (ACB) containing cytoplasmic matrix are seen projecting into the lumen. Lumen contains vacuoles (V) of various sizes bounded by membranes containing flocculent material and homogeneous electron-dense secretions. Junctional complexes (Jc) are seen between lateral membranes of adjacent cells. 20,000× magnification.