Figure 3 in Ultrastructure of spermatozoa and spermatogenesis in Octopus minor (Sasaki, 1920) (Cephalopoda: Octopoda)

Figure 3. Observation of head and neck of spermatozoon of Octopus minor under TEM. (A–B) Longitudinal section of spermatozoon at acrosome and anterior nucleus; (C–D) transverse section of acrosome; (E–G) longitudinal section of spermatozoon at nucleus, endonuclear channel and neck; (H) transverse section of spermatozoon at anterior nucleus; (I) transverse section of posterior nucleus. AV: acrosomal vesicle; AVL: acrosomal vesicle lacuna; PT: protuberance; SAL: sub-acrosomal lacuna; ST: striation; SM: skirt membrane; EC: endonuclear channel; CF: coarse fibre.