Dynamic .htaccess URL Redirects to Subfolders

I have a website with Wordpress installed in a subfolder (i.e. www.mydomain.com/wordpress). Currently, I've an .htaccess file in the top folder that redirects all traffic from "www.mydomain.com" to "mydomain.com/wordpress". However, my organization also puts out a print publication that requires us to print URLs that are as short and verbose as possible, such as "mydomain.com/news" or "mydomain.com/culture". How can I have the server redirect from "mydomain.com/foo" to "mydomain.com/wordpress/foo"? "foo" in this case could be anything: this is the "dynamic" part of my question; I don't know what redirections will be needed in the future, and I'd rather not have to edit the .htaccess file for every situation we encounter.
Thanks in advance!