Tissue : A group of cells similar in structure, function and origin.
In a tissue cells may be dissimilar in structure and function but they are always similar in origin. 

–    Word animal tissue was coined by – Bichat 

–    N. Grew coined the term for Plant Anatomy.

–    Study of tissue – Histology    

–    Histology word was given by – Mayr

–    Father of Histology – Bichat

–    Study of tissue is also called Microscopic anatomy.

–    Founder of microscopic anatomy – Marcello Malpighi     

TYPES OF TISSUES 

Based on the location and function the animal tissues are classified into four types :