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. [ http://en.wikipedia.org/wiki/Navicular_fossa_of_male_urethra ]