* Consists of a small medial tubercle intimately associated on each side with lymphatic folds and vessels.
* Consists of a small medial tubercle intimately associated on each side with lymphatic folds and vessels.
* When erect with lymph, the phallus develops a median groove.
* When erect with lymph, the phallus develops a median groove.
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** Median groove permits passage of ejaculate down into the everted female [[Exotics_-_Anatomy_of_the_Female_Reproductive_System_- Anatomy & Physiology#Oviduct|oviduct]].
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** Median groove permits passage of ejaculate down into the everted female [[Avian Female Reproductive System & Egg Formation#Oviduct|oviduct]].