the study of cells · ribosomes cytoskeleton types of non membranous organells modifications...
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The study of cells
By
Dr. Osama Ibraheim Ramadan
Lecturer of Histology
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CELL STRUCTURE
Cytoplasm Nucleus
Two major structures are
found in the cell
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Nucleus
Cytoplasm
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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 :
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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
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❑ 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
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Free Attached
Types of Ribosomes
Polysomes
• Functions of Ribosomes:-
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Cytoskeleton
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Thin intermediate
Types of Filaments
Thick
Filaments One of the membranous cytoplasmic organelle that considered the
cytoskeleton.
❑ Definition:
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Microtubules
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Centriole
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Cilia
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Nucleus
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