Golgi apparatus
It was discovered by Camillo Golgi. He name it as internal reticular apparatus.
It has many other names such as Golgi bodies, Golgi complex, Golgi material.
Occurrence:-it is absent in prokaryotic cell, certain fungi, sperm cells, cells of bryophytes and pteridophytes, cell of mature sieve tubes and RBC.
Morphology:-
1. It is pleomorphic i.e. in some cell types it appears compact and Limited, in others spread out and netlike.
2. A group of cisternae is called dictyosome and a group of dictyosomes makes up the Golgi apparatus.
- Cisternae- it is sac like closed components which are held in parallel bundles. In each stack cisternae are separated by a space of 20 to 30 nm which may contain lot like elements or fibres. Each stack of cisternae form a dictyosome which may contain 5 to 7 Golgi cisternae in animal cells or 20 or more cisternae in plant cells.
- Tubules- It is like of endoplasmic reticulum's tubules . It is 30-50 nm diameter.
- Vesicles- It is 60 nm in diameter. It is of three types:-
I) Transitional vesicles- They are small membrane limited vesicles which are thought to form blebs from the transitional ER to migrate are converge to cis face of Golgi.
II) Secretory vesicles- They are varied-sized membrane limited vesicles which discharge from margins of cisternae of Golgi. They often occur between the maturing face of Golgi and the plasma membrane.
III) Clathrin-coated vesicles- They are spherical protuberances , about 50 micrometre in a diameter and with a rough surface. They are found at periphery of the organelle, usually at ends of single tubules. The vesicles are known to play a role in intra-cellular traffic i.e. between ER and Golgi.
PIC:- GOLGI APPARATUS
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