Prostate gland lobe that in the mouse has the following characteristics: grossly, clear, gelatinous, and leaf-like; originates ventrally and wraps incompletely around the urethra dorsally, bilaterally. Simple columnar epithelium with the least amount of infolding. Secretory cells are oval and have slightly foamy cytoplasm; nuclei and basal nucleoli are inconspicuous. The secretion is pale and homogeneous. The stroma is thin. [ http://www.ncbi.nlm.nih.gov/pubmed/15163300 ]