Golgi apparatus diagram

ADVERTISEMENTS: Italian histologist Camillo Golgi (1898) first discovered Golgi apparatus in the nerve cells of bran owl and cat by metallic impregnation technique using, mixtures of silver salt osmium chloride. Dalton and Felix (1954) described its electron microscopic structure. Definition: Golgi apparatus is a complex network of smooth membrane enclosed organelle which helps in collection, packaging, distribution and secretion of biomolecules. Location: ADVERTISEMENTS: The Golgi apparatus occurs in all eukaryotic cells except male gametes of bryophytes and pteridophytes, mature sieve tubes, some fungal cells, and mature sperms and RBCs of animals. It is also absent in prokaryotic cells. Distribution: In most animal cells Golgi apparatus is single and localized near nucleus and often close to the centrosome. But in most invertebrate cells, it is diffused in form of two or more interconnected units. However in most plant cells, liver and nerve cells of vertebrate the Golgi apparatus consists of many independent units called dictyosomes or Golgi bodies or Golgi stacks. Their number is highly variable – from one in simple alga like Micromonas to 25000 in rhizoidal cell of aquatic alga chara. A liver cell may have up to 50 dictyosomes. The Golgi apparatus constitutes about 2 % of total cell volume. Structure: Golgi apparatuses extremely dynamic and pleomorphic structure because of its variable shape and form in different cell types. The Golgi apparatus of plant cells consist...