Emergencies are very diversified: clinical setting, age, sex, circumstances, medicine, surgery, psychiatry, specialties. The admission into the specific departments depends on geographical, demographical features (distances to be covered...). They are theoretically unscheduled but sometimes out-hospital messages can be sent to improve the reception or to decide a very short circuit. Emergency rooms exist in most hospitals and are not so often appropriate. Emergency reception requires a place and a technical assistance where to get in touch with and to perform as quick as possible the formalities, first diagnosis and first aid procedures and orientation to the appropriate department. As a main frame in the network of assistance and care, emergency department ought to be a unique place with multiple disciplines (medicine, surgery, psychiatry), where universal first aid technical assistance and unified working would open to al hospital departments or a piece of hospitals. This structure relies on well dispatched areas, with easy ways, many examinations, simultaneous actions, urgent complementary tests and families reception. A hospital, practitioner must be in charge, whom speciality deals with emergency. Staff must include on-call doctors who can be helped by at-home physicians and many competent paramedics: nurses, health workers, stretcher-bearers, X-ray handlers, drivers, operators, secretaries, social workers, hostesses... Specific arrangements must be taken for special X-rays, biology and hospital reception of medico-surgical, obstetrical, psychiatric, social, medico-legal and medico-judicial emergencies. Running of that structure, mainly facing severe emergencies, must go together with out-hospital medical advises, patients admission for some time or a brief relief (control and social cases). In all cases, connection between out-hospital set-ups, various medical sittings and hospitals in the main goal which must be achieved with the S.A.M.U. Emergency medicine is universal, sequential, discontinuous with a social aspect open to a town or a district. If someone wants to be technically irreproachable, he needs to get together most of the existent structures to have a performant material and as much and efficient staff as possible.