Embalming practice has changed a great deal in the last few hundred years. Modern embalming for anatomical purposes no longer includes evisceration, as this disrupts the organs in ways that would be disadvantageous for the study of anatomy. As with the mixtures of chemicals, embalmers practicing today can use different methods for introducing fluids into the cadaver. Fluid can be injected into the arterial system (typically through the carotid or femoral arteries), the main body cavities, under the skin, or the cadaver can be introduced to fluids at the outer surface of the skin via immersion.