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Drawings of morphogenesis of the human penile urethra. The solid urethral plate canalizes to form the urethral groove, whose edges fuse in the midline to form the tubular penile urethra. Small opposing arrows indicate future fusion of adjacent epithelial surfaces. This developmental process has been observed in all species examined to date and appears to also apply to the spotted hyena. (adapted from Yamada, Satoh, Baskin, L. and Cunha, 2003 with permission)
