navicular fossa of spongiose part of urethra

http://purl.obolibrary.org/obo/UBERON_0012294

The dilated terminal portion of the male spongy urethra located in the glans penis right before the external urethral orifice, also referred to as the most distal pendulous urethra; it is lined by stratified squamous, non-keratinizing epithelium; during development, the glans of the penis is initially solid but cannulates to give rise to the navicular fossa. [ MP:0011838 http://en.wikipedia.org/wiki/Navicular_fossa_of_male_urethra MP:anna ]

Synonyms: fossa navicularis of urethra, navicular fossa, navicular fossa of urethra, fossa navicularis urethrae (pars spongiosa, urethra masculina), fossa navicularis urethrae