1 Introduction. - A. Approaching the Neural Mechanisms of Behavior. - B. Old Questions New Tools. - C. Why Lordosis Behavior?. - D. Behavioral Description of Lordosis. - 1 Triggering the Behavior: Sensory and Ascending Pathways. - 2 Stimulus. - 3 Primary Sensory Neurons. - 4 Spinal Interneurons. - 5 Ascending Neural Pathways. - 2 Facilitating the Behavior: Sex Hormones in the Brain. - 6 Steroid Sex Hormone Binding by Cells in the Vertebrate Brain. - 7 Hypothalamic Mechanisms. - 8 Hypothalamic Outflow. - 9 Midbrain Module. - 3 Executive Control over the Behavior: Descending and Motor Pathways. - 10 Brainstem to Spinal Cord. - 11 Motoneurons and Response Execution. - 4 Building on this Paradigm. - 12 Logical and Heuristic Developments. - 13 Summary. - 14 Epilogue. - References. Language: English