ANIMAL TISSUES 

Image Source =  https://pixabay.com/

TISSUES 

All cells are well organised and co-ordinated to work in a group in multicellular organisms.

A group of similar cells along with intercellular substances performs a specific function , such as organisation is known as Tissue. 

The terms 'Tissue' was introduced by Bichat and he is the father of Histology [study of tissue]

A tissuecan also be defined as a group of one or more types of cells having a same origin and specialised for specific function along with the intercellular materials. 

                                                 tissue figure or bichat photo 

TISSUE LEVEL 

The cells performing the same function are arranged into tissue, hence is called tissue level of organisation  ex. - coelontrates , the arrangement of cells is more complex. 

TYPES OF ANIMAL TISSUE 

The structure of the  cells varies according to thier function. 

This variation in cells leads to the formation of following four types of tissue on the basis of their location and function. 

(1). Epethilial                                                          (2). connective 

(3).Muscular                                                           (4). Neural 

(1). EPETHILIAL TISSUES 

Epethilial tissue or Epethiliul (epi -upon ; thele - nipple) covers both external and internal surface of the animal body .

The  Epethilial Tissue has a free surface, which faces either a body fluids or the outside environment or thus, provides a covering or a lining for some parts of the body. 

                                           

                                       epithilial tissues figures 

CHARACTERISTICS 

The characteristic feature of epethilial tissues are as follows :- 

(1). The cells are compactly arranged.

(2). Intercellular spaces are narrows, 20-30nm wide. 

(3). Blood vessels are not present in the epethilial tissue. 

(4). Nerve endings may penetrate the epethilial tissues. 

TYPES OF EPETHILIAL TISSUES 

(1). Simple squamous Epethilium.

(2). Pseudostratified epethilium 

(3). Simple cuboidal Epethilium 

(4). Simple coloumnar epethilium 

(5). stratified squamous epethilium 

(6). Keratinized stratified squamous epithelium

all , figure of this tissue type

2. CONNECTIVE TISSUE

This types of  Tissue consist lot of extracellular metrix.

The connective tissueare most abundant and widely distributed in the body of complex animals.

They are named as connective tissues because of their special function of linking and supporting other tissues/organs.

THE CONNECTIVE TISSUE ARE MANY TYPES 

(1). Loose connective tissue 

(2).   Adipose tissue 

(3).  Cartilage tissue

(4). bone tissue 

(5). blood 

connective  tissue figure 

3. MUSCULAR TISSUE 

The muscular tissue consists of  elongated and compound cells called muscle cells or myocytes .

Due to their elongated nature, the muscles cells are often called muscles fibre.

It develops from mesoderm. the cells are by connective tissue. 

muscular tissue figure 

TYPES OF MUSCLES TISSUE 

There are three types of  muscular tissue 

(1). striated or striped or skeletal or voluntary muscles. 

(2). Non striated or unstriped or visceral or smooth or involuantry muscles. 

(3).Cardiac muscles .

cardiac muscles or striated or non striated muscles figure