Navicular fossa of male urethra
（重定向自Fossa navicularis urethrae）
![](/Images/godic/202501/14/Gray11421542.png")
The cavernous portion of the urethra is narrow, and of uniform size in the body of the penis, measuring about 6 mm in diameter; it is dilated behind, within the bulb, and again anteriorly within the glans penis, where it forms the fossa navicularis urethrae.