احلىصور للمكن الصينئ
Pharynx Mouth Seminal receptacles gonopore Male gonopore Seminal vesicles Aortic arches (hearts) Cerebral ganglia (brain) Prostomium Dorsal blood vessel Buccal cavity Multiple coiled nephridia Calciferous glands Crop and gizzard Ventral blood vessel Nerve cord and segmental ganglia Intestine Segmental nerves Septa Mouth Seminal receptacles .