University School of Medicine, St. LouisNature and Nurture: A gene is on the nature sideA gene is a part ... . - thalamus b) vent. tegmental pathway ; vent. teg. sub. nigra - subthalamus, hypothalamus basal ... forebrain area c) septal pathway ; septal area - hippocampus, cb. cortex mesencephalonAcetylcholine