02 Decalcification Flashcards
a specialized connective tissue
bone
the bone has a hard, rigid nature due to the inclusion of minerals in its ___ ___
osteoid matrix
crystalline component of the bone
hydroxyapatite
serves as a reservoir for a multitude of inorganic ions
hydroxyapatite
interfere with the accurate evaluation an examination of histologic sections
calcium (lime salt)
calcified specimen will not section properly due to the difference in ___ between ___ and ___
densities
calcium
paraffin
T/F: calcium may be present in the arteriosclerotic vessel
T
a procedure that removes calcium from calcified tissues
decalcification
Decalcification happens after ___ and before ___
fixation
impregnation
done to make the tissue soft enough to section in paraffin
decalcification
this process makes the bone thin enough for histological observation
grinding
in this process, the canaliculi and cell lacunae are well-seen
ground sections
organic compounds capable of binding with certain metals
chelating agents
chelating agents are typically very ___ and ___
slow acting
gentle
chelating agents are used for ___ ___ and ___ studies
electron microscopy
immunohistochemistry
a process whereby positively charged calcium ions are attracted to a negative electrode and subsequently removed from the decalcifying solution
electrophoresis
this reduces the effects of decalcifying agents on staining
post-decalcification
a tiny abnormal deposit of calcium salts that is often an indicator of cancer
microcalcification
microcalcification is most common in which tissue sample?
female breast
microcalcification appear as ___ ___ granular masses with lighter ___ ___
dark purple
purple halos
the purple halos in the microcalcification is stained with ___
hematoxylin
decalcifying agent:
for routine decalcification of large amounts of bony tissue
acids
decalcifying agent (acid):
most common
nitric acid
decalcifying agent (acid):
fastest
nitric acid
decalcifying agent (acid):
recommended for routine purposes
nitric acid
decalcifying agent (acid):
inhibit nuclear stain
nitric acid
decalcifying agent (acid):
destroy tissues
nitric acid
decalcifying agent (acid):
Perenyi’s fluid
nitric acid
decalcifying agent (acid):
mot rapid decalcifying agent
Phloroglucin-Nitric acid
In decalcification, acid must be removed by ___ changes of EtOH
3
decalcifying agent (acid):
slower
hydrochloric acid
decalcifying agent (acid):
greater distortion
hydrochloric acid
decalcifying agent (acid):
good nuclear staining
hydrochloric acid
decalcifying agent (acid):
Von Ebner’s fluid
hydrochloric acid