The term autonomic nervous system (ANS) refers to collections of motor neurons (ganglia) situated in the head, neck, thorax, abdomen, and pelvis, and to the axonal connections of these neurons (Figure 1).rain and spinal cord pathways regulating autonomic outflow. Preganglionic neurons for parasympathetic and sympathetic autonomic outflow are located in the brainstem and in thoracic, upper lumbar and sacral regions of the spinal cord (Figure 1). Several different brain centres control these preganglionic neurons.
A: Moon phases are caused by the motions of the Earth and moon as they relate to the sun. Phases occur as the Earth-facing side of the moon changes over the course of 29.5 days when the moon revolves around the planet. When the angle of sunlight reflecting off the moon changes, humans observe different lighting levels from the moon.
1 This means that the Sun and the Moon make a 90-degree angle compared to the Earth. 2  Waxing Gibbous â This phase of the Moon occurs when the Moon is more illuminated that half, but itâs not yet a full Moon. 3  Full Moon â This is the phase when the Moon is brightest in the sky. Full Moon â This is the phase when the Moon is brightest in the sky. 2  From our perspective here on Earth, the Moon is fully illuminated by the light of the Sun. 3  This is also the time of the lunar month when you can see lunar eclipses â these occur when the Moon passes through the shadow of the Earth.