The study of cells
By
Dr. Osama Ibraheim Ramadan
Lecturer of Histology
CELL STRUCTURE
Cytoplasm Nucleus
Two major structures are
found in the cell
Nucleus
Cytoplasm
Living structures
(Organells) Non Living structures
(Inclusions)
•Membranous
i.e. surrounded
by a membrane .
Structure of the cytoplasm
Matrix
carbohydrates, lipids, proteins,
and RNAs
•Non-membranous
i.e. not surrounded
by a membrane as :
Ribosomes
cytoskeleton
Types of Non membranous organells
modifications
•Cell membrane
i.e. cilia,
flagella,microvilli
•microtubule
s i.e. centriole
•Filaments i.e.
thin , thick,
intermediate
•microtubule
s i.e. centriole
❑ Definition :Non Membranous cytoplasmic
organelle considered as the
protein synthesis sites.
❑ By L.M :Basophilic .
❑ By E.M :➢ large and small subunits
unassociated with membranes.
Ribosomes
Free Attached
Types of Ribosomes
Polysomes
• Functions of Ribosomes:-
Cytoskeleton
Thin intermediate
Types of Filaments
Thick
Filaments One of the membranous cytoplasmic organelle that considered the
cytoskeleton.
❑ Definition:
Microtubules
Centriole
Cilia
Nucleus
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