Receptor for the tridecapeptide neurotensin. It is associated with G proteins that activate a phosphatidylinositol-calcium second messenger system. Expressed maximally in the cerebellum, hippocampus, piriform cortex and neocortex of adult brain. Expressed poorly in 7-day-old brain. Expression increases at day 15 to reach a maximal level in 35-day-old brain. Belongs to the G-protein coupled receptor 1 family. Neurotensin receptor subfamily. NTSR2 sub-subfamily.