Anatomy of Body Tissues: Epithelial Tissue and Its Classifications, Assignments of Anatomy

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THE BODY TISSUES

1 - Epithelial tissue. 2 - Connective tissue. 3 - Muscular tissue. 4 - Nervous tissue.

• Classification:
• Epithelium is classified according to its function into: 1 - Covering Epithelium 2 - Glandular epithelium 3 - Neuroepithelium

( 1 ) Simple squamous epithelium

( 1 ) Simple squamous epithelium

( 2 ) Simple cubical epithelium

( 3 ) Simple columnar epithelium:

• This type can be further subclassified into: A- Non-modified simple columnar epithelium :
• Consists of a single layer of tall cells (like columns) with basal oval nuclei. e.g the lining of large ducts of glands.

2 - Simple columnar absorptive epithelium:

• The epithelial cells have the ability for absorption.
• The apical surface of the columnar cells is provided with microvilli (brush border by L/M) to increase it area.
• Example lining epithelium of the intestine.

• 3 - Simple columnar ciliated epithelium :
• Cilia project from the free surface of the cells.
• Example - fallopian tube
• - uterus.

Pseudostratified columnar non-

ciliated epithelium

• The surface of the tall columnar cells are not provided with cilia e.g:
• Lining of large ducts of the glands.

Pseudostratified columnar ciliated epithelium

• Nasal sinuses
• Trachea, bronchi
• Eustachian tube.