1o_ Part of the body in animals where the mouth and major sensory organs are usually found; in many, especially the upper ones, is also located the central nervous system. 2o_ By the previous one, the most important part of something, who directs, who thinks, what goes forward. 3o_ By methoniamy is every person, every res. 4o_ By the shape, mainly in animals that have thinner neck, it is any part bulging at the end of something (bones, pins, branches).