The progression of the subthalamic nucleus over time from its initial formation until its mature state. The subthalamic nucleus is the lens-shaped nucleus located in the ventral part of the subthalamus on the inner aspect of the internal capsule that is concerned with the integration of somatic motor function. [ GOC:jid http://purl.obolibrary.org/obo/go/references/0000021 GOC:dph GOC:cls GOC:dgh http://openisbn.com/search.php?q=0878937420&isbn=1/ ]