THE EPITHELIAL TISSUE Amal almuhanna. THE EPITHELIAL TISSUE Amal almuhanna.

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Presentation transcript:

THE EPITHELIAL TISSUE Amal almuhanna

Types of Epithelia Covering “surface” epithelium. Glandular epithelium. Neuro_epithium. simple Stratified

Surface “Covering” Epithelium : Simple Squamous, cuboidal, columnar Stratified Str. Squamous Str. Cuboida Str. columnar Pseudostratified Pseudostratified columnar

Simple Epithelium : Consists of a single layer of cells, with each layer extending from basement membrane to free surface, ± microvilli. Squamous cuboidal columnar

Simple Epithelium

Stratified Epithelium: Consists of more than one layer of cells, only one of which is attached to the basement membrane. Types: Squamous cuboidal columnar

Stratified Sq. Epithelium

Stratified cuboidal Epithelium:

Stratified Col. Epithelium:

Transitional Epithelium: Stratified cells that appear cuboidal when the organ or tube is not stretched and squamous when the organ or tube is stretched by fluid.

Transitional Epithelium:

Pseudo Stratified Epithelium: Single layer of cells: some tall and thin and reach the free surface + small basal cells . Nuclei are at different levels (appear stratified). Cells are almost always ciliated (associated with goblet cells).

Pseudostratified Epithelium:

Classification of Glandular Epithelium: According to : Number of cells. Unicellular & multicellular. Struture of the gland. Simple &branched Mode of secretion. Exocrine & endocrine. Type of secretion. Serous,mucous etc.. Cllular changes after secrtion. Merocine , apocrine and holocrine.

Exocrine Glands Unicellular

Multicellular Exocrine Glands:

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