Changes

*** Tissues selected from the dead body after necropsy.

*** Tissues selected from the dead body after necropsy.

*** Biopsy/excision materials from lesions in the living animal.

*** Biopsy/excision materials from lesions in the living animal.

5. Histochemistry - microscopic visualisation of enzymatic activity in tissues.

* '''Histochemistry'''

6. Immunological methods - detection of specific antibody activity in tissues and fluids.

** Microscopic visualisation of enzymatic activity in tissues.

When linked to a marking agent i.e. a fluorescent dye or other

* '''Immunological methods'''

substance, it can localise in the tissue the antigen for that

** Specific antibody activity can be detected in tissues and fluids.

particular antibody.

*** When linked to a marking agent (e.g. a fluorescent dye), an antibody can localise its antigen in the tissue.

7. Electronmicroscopy - fine detail of the surfaces or internal structures of cells.

8. Bacteriology /Virology/Parasitology - isolation and identification of pathogenic

** Electronmicrosopcy shows fine detail of the surfaces or internal structures of cells.

bacteria/viruses/parasites.

* '''Bacteriology/ Virology/ Parasitology'''

9. Toxicology - analysis of tissues for particular poisons and toxins.

** These techniques allow the isolation and identification of pathogenic bacteria, viruses and parasites.

* '''Toxicology'''

** Analysis of tissues for particular poisons and toxins.

==Degenerations and Infiltrations==

==Degenerations and Infiltrations==