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The copulatory apparatus of the male turkey consists of two parts: the Phallus nonprotrudens, composed of the paired Corpora phallica lateralia and Plicae lymphaticae, and the paired Corpora vascularia paracloacalia. The Corpus vasculare paracloacale receives its vascular supply and drainage from the Arteria (A.) and Vena (V.) pudenda interna, respectively, and its innervation from the Nervus pudendus internus. During sexual stimulation lymph produced in the Corpora vascularia paracloacalia rapidly flows through the lymph sinuses into larger lymph channels located in the Phallus nonprotrudens producing tumescence. With detumescence, the lymph flows cranially from Phallus nonprotrudens into the Vasa lymphatica pudenda interna, which parallels the A. and V. pudenda interna.

The anatomical structure of the ejaculatory groove region (EGR) of the drake was investigated macro- and microscopically in connection with its function. The EGR covers a part of the urodeum and the second fold of the cloaca. The EGR is unique to the males and is characterized by red colored appearance and less smooth surface of the mucosa. The mucosa of EGR forms folds giving less smooth surface to it and is lined with psuedostratified columnar epithelium. A vascular layer which contains many capillaries and lymphocytes and gives red color to the mucosa lies just beneath the epithelium. The EGR develops at puberty together with the developments of the testis and the penis. Blood supply and the arrangement of the lymphatic sinuses of EGR were described and their functions were discussed.