the study of cells · ribosomes cytoskeleton types of non membranous organells modifications...

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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