"ailerons" is a descriptive term in French and will not necessarily be translated by the same English word in each anatomical location. It is impossible to translate these terms with any confidence if you don't give the exact and correct context.

For example, "ailerons prostatiques" - I found mention of this structure in only one article on the net, the description of a surgical procedure mobilising the prostate. I think it is likely that "ailerons" here refers to the lateral prostatic fascia.

http://www.marinurology.com/articles/cap/rpp/surgery/divisio...

After an extended radical or nerve-sparing dissection has removed the ventral rectal fascia over the junction of the prostatic apex with the membranous urethra, any remaining myofascial fibers are incised transversely over this junction to expose the white wall of the urethra. If an extended radical dissection has been performed, it is necessary at this time to divide the ***wing of lateral prostatic fascia*** lateral to the membranous urethra that extends to Santorini's venous plexus beneath two large hemoclips placed as ventrally as possible.