how to view table foreign keys/triggers?

Hello,
I was wondering if you could show me how I could find out which columns
in a table are constrained by foreign keys?
I tried \d mytable and then \dd RI_ConstraintTrigger but only got this
on all of the triggers:

     Object descriptions
 Name | Object | Description
------+--------+-------------
(0 rows)

How can I view the content of a trigger?  Is this the best way to learn
about a table's foreign keys?

Thank you very much for your help!

-- karin --