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 GOC:cls GOC:dgh GOC:dph https://www.worldcat.org/search?q=bn%3A0878937420 http://purl.obolibrary.org/obo/go/references/0000021 ]