There are two varieties of Embryonal connective tissue present- Mesenchyme and Mucous. Mesenchyme consists of a network of branching cells, in the meshes of which is a homogenous intercellular fluid. The processes of a cell appear to anastomose with those of other cells. As development progresses, wavy primitive fibres appear between branching cells and the […]
Classification of Connective tissue described in this figure-
The various types of adult connective tissues in contrast to epithelium have relatively a few cells and a large amount of intercellular substance. But the proportion of these two elements shows variations. In some type, especially loose connective tissue, cells are quite numerous. In other types, they are few in number and tissue is composed
Stratified epithelium are classified on the basis of the number of cell layers and the shape of the cells in the surface layer. If there is only one layer of cells in the epithelium, it is designated simple. If there are two or more layers of cells, it is termed stratified. Cells in the surface
These are the Special features of epithelium described below- Glandular epithelium It refers to the lining and secretary cells of the glandular organs, which are developed as down growths from the epithelial layer in the underlying connective tissue, followed by structural modification and differentiation. Neuro-epithelium It denotes the specialized epithelial cells in certain locations, which
Pseudo stratified epithelium type of epithelium the nuclei, lie at different levels giving it a stratified appearance. All the cells reach the basement membrane but not all of them extend to the surface. Those reaching the surface are columnar with one or more processes extending to the basement membrane. Between these are ovoid or spindle shaped Basal
Transitional epithelium is seen in the mucous membrane of the excretory passages of the urinary system. The cells are often divided into three groups: the basal polyhedral cells, the intermediate pear shaped or pyriform cells with their broad, end towards the free surface and flattened or umbrella like surface squamous cells. This epithelium accommodates itself to cover larger
Simple epithelium only one layer of cells present on the basement membrane. It can be classified as simple squamous, simple columnar and simple cuboidal type. Simple squamous epithelia The simple epithlia is also called as pavemental epithelia. Consists of flat scale like or plate like squamous cells separated by narrow intercellular spaces. The edges of the cells are usually
Epithelia are classified on the basis of the number of cell layers and the shape of the cells in the surface layer. Based on number of cell layers Simple epithelia: one layer of cells in the epithelium. Stratified epithelia: two or more layers of cells. Based on Shape of cells Cells in the surface layer are, as
Epithelium is composed primarily of cells between which a very little amount of intercellular substance exists. It is an unilaminar or multilaminar sheet of cells which covers the body surface and lines the body cavities or tubular passages. Shape and arrangement of epithelial cell The shape of epithelial cells varies from a very flat type – squamous, a tall rod-like columnar
