GOLGI APPARATUS AND IT'S STRUCTURE

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

Know about endoplasmic reticulum (click here)

THANK YOU FOR READING

If you like our content please share our blog ,comment for suggestion and tell us what you need to know in the next content.