part of spermatid spermatocyte spermatogonium membrane-bounded organelle Golgi apparatus Peter Michalik SPD:0000758 2014-12-29T19:24:12Z GO:0005794 dictyosome A compound membranous cytoplasmic organelle of eukaryotic cells, consisting of flattened, ribosome-free vesicles arranged in a more or less regular stack. The Golgi apparatus differs from the endoplasmic reticulum in often having slightly thicker membranes, appearing in sections as a characteristic shallow semicircle so that the convex side (cis or entry face) abuts the endoplasmic reticulum, secretory vesicles emerging from the concave side (trans or exit face). spider_anatomy