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Introduction to human histology

Published on April 30, 2023   54 min

A selection of talks on Physiology & Anatomy

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0:00
I am Dr. Banumathy, an anatomist from Madurai Tamilnadu India. The topic for today is Introduction to Human Histology.
0:13
Histology is the study of the human body with the help of a microscope. Hence, it is also called microscopic anatomy or microanatomy.
0:24
The structural and functional units of the human body are the cells. The body is made up of billions and billions of cells. Each cell has a nucleus surrounded by cytoplasm and bounded by a cell membrane.
0:41
The details of the cell cannot be clearly made out when kept under the microscope, so stains are used to study the different components of a cell. The commonly used stains are hematoxylin and eosin. Haematoxylin is a basic stain, nucleus-basophilic, and hence, stained blue. Eosin is an acidic stain, made part of the cytoplasm is acidophilic and hence, stained pink;
1:13
the cells vary in size, shape, and function. They can be small or large, cubical or columnar, round or oval, spindle shaped, or star-shaped. The size of the nucleus also varies. It can be spherical or oval, compressed or lobed, central or eccentric in position. The cytoplasm can be smooth, striated, or granular. The intercellular substances also varies. Homogeneous, amorphous, granular, crystalline, mucoid, or fluid.