Navicular fossa of male urethra
Encyclopedia
The cavernous portion of the urethra is narrow, and of uniform size in the body of the penis
Penis
The penis is a biological feature of male animals including both vertebrates and invertebrates...

, measuring about 6 mm in diameter; it is dilated behind, within the bulb
Bulb of penis
Just before each crus of the penis meets its fellow it presents a slight enlargement, named by Kobelt the bulb of the corpus spongiosum penis.It is homologous to the vestibular bulbs in females....

, and again anteriorly within the glans penis
Glans penis
The glans penis is the sensitive bulbous structure at the distal end of the penis. The glans penis is anatomically homologous to the clitoral glans of the female...

, where it forms the fossa navicularis urethræ.

The navicular fossa is the spongy part of the male urethra located at the Glans Penis portion. It is essentially the part right before the External Urethral Orifice. It is lined by stratified squamous, non-keratinizing epithelium if viewed histologically.
DOTE Anatomy - 2007

During development, the glans of the penis is initially solid but cannulates to give rise to the navicular fossa.
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