Show constraints on tables command

I have tables that I've tried setting PK FK relationships on but I want to verify this. How can I show the PK/FK restraints? I saw [this][1] manual page, but it does not show examples and my google search was fruitless also. My database is `credentialing1` and my constrained tables are `practices` and `cred_insurances`. [1]: http://dev.mysql.com/doc/refman/5.5/en/table-constraints-table.html