Ex vivo (Latin: out of the living) means that which takes place outside an organism. In science, ex vivo refers to experimentation done in or on living tissue in an artificial environment outside the organism. The most common "ex vivo" procedures involve living cells or tissues taken from an organism and cultured in a laboratory apparatus, usually under sterile conditions for a few days or weeks. The living cultured cells serve as models of the whole organism, reducing the need for vivisection. One widely performed ex vivo study is the chick chorioallontoic membrane (CAM) assay. In this assay, angiogenesis is promoted on the CAM membrane of a chick embryo outside the organism (chicken). Ex vivo studies are usually performed in vitro, although the use of these two words is not synonymous.
In vitro (Latin: (with)in the glass) refers to the technique of performing a given experiment in a test tube, or, generally, in a controlled environment outside a living organism. In vitro fertilization is a well-known example of this. Many experiments in cellular biology are conducted outside organisms or cells, thus, the conditions and, therefore, results may not correspond to those inside. Consequently, experimental results are often annotated with in vitro or its opposite in vivo as it applies.
In vitro (Latin: (with)in the glass) refers to the technique of performing a given experiment in a test tube, or, generally, in a controlled environment outside a living organism. In vitro fertilization is a well-known example of this. Many experiments in cellular biology are conducted outside organisms or cells, thus, the conditions and, therefore, results may not correspond to those inside. Consequently, experimental results are often annotated with in vitro or its opposite in vivo as it applies.
from wikipedia
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