OHE Flashcards
is branch of medical science that deals
with the study of minute structures of the tissues
and organs of the body.
Histology
is a branch of science that deals
with the study of microscopic structures of oral and
dental tissues.
oral histology
s a group of cells with intercellular substance
and tissue fluid, performing a definite function
Tissue
Group
of tissue performing special functions form the
organs
Aggregation of organs with definite
functions is known as
organ system
is a unit of living matter
Cell
cell is made
cytoplasm and nucleus
The external boundary of a cell is known as
plasma membrane or plasmalemma
Protoplasm inside the cell is the cytoplasm
containing 3
Organelles
Inclusion bodies
Amorphous matrix.
The most prominent organelle of the cell.
Nucleus
The nucleus is covered by a thin membrane known as
Nuclear membrane
Within the nucleus are the nucleolus and irregular masses known
chromatin material
chromatin material composed of
RNA
Suspended in ground substance known as
Karyolymph (nucleoplasm)
are membrane-bound cell organelles
Mitochondria
Chemical energy
produced by the mitochondria is stored in a small molecule called
Adenosine triphosphate (ATP)
shows various forms but the most common is in form of plates or lamellae or plates may dilate to bowl-shaped
structure (cisternae).
Golgi complex
Consist of minute fluid containing
membrane-bound tubules known as canaliculi, cisternae, or vesicles which may form sometimes a network (reticulum) or maybe in
form of granules (when free are known as ribosomes or polysomes)
Endoplasmic reticulum
When granules adhere to the outside membrane, they form
Rough surface endoplasmic reticulum (R E R)
tubules lacking
ribosomes are known as
smooth surfaced endoplasmic reticulum (S
E R).
are located close to nucleus in a
specialized area of the cytoplasm known as centrosome or cell
center.
Centrioles or Liposomes
these appear as two stained bodies
(in light microscope) or
hallow and tubular (in electron microscope).
are minute threadlike bodies of different lengths and
circumferences
Filaments
In ______the threadlike structures are
called tonofilaments of fibroblast, cytoplasmic fibril; nerve cells, neurofilaments, and of muscles, myofilaments
Mitosis
are single membrane-bound bodies containing
powerful digesting enzymes which assist the cell in destroying foreign particles or prevent the cell from overproducing by digesting some of the secretions.
Lysosomes
Are tiny, straight and tubular organelles often of different lengths.
Microtubules
The inclusion bodies are composed of 7
carbohydrates
protein,
pigments
crystalloids
fat
gas
and other metabolites or foreign
materials.