histology-lab - Tissues page 1 of 5 ANAT 11110 Fall 2011...

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Tissues page 1 of 5 ANAT 11110 Lab 4 Fall 2011 The Tissue Level of Organization Although body cells share many structures and functions in common, they may differ considerably in size, shape, and structure, in accordance with their specialized functions. A collection of cells that are similar in structure and function is called a tissue. There are four basic tissue types in the human body. Each of these basic types can be further subdivided into subcategories based on their specific morphology and function. In this lab, we will be looking at slides of epithelial and connective tissue. The scientific study of tissues is called ‘histology ’. Epithelial Tissue Epithelial tissue covers surfaces of the body and internal organs, lines cavities and forms glands. Morphologically, it is characterized by having closely packed cells. Epithelial tissue always has a free surface and is always underlined by connective tissue; it is connected to this underlying connective tissue by a ‘basement membrane ’, composed of elements of both epithelium and connective tissue. Epithelial tissue is classified on the basis of single (‘simple’) or multiple (‘stratified’) cell layers and by the shape of the cells in the uppermost cell layer (‘squamous’ [i.e., flat cells], ‘cuboidal’, or ‘columnar’). Station I: Simple Epithelium Epithelia in this category are composed of a single layer of cells. Observe the slides of simple squamous epithelium . These cells are thin and flat and appear as tightly fitted irregular polygons with a centrally placed nucleus, in a surface view. From the side, they will appear flat, with the nucleus compressed between the free edge and the basement membrane. In the spaces below, draw a diagram of simple squamous epithelium. simple squamous epithelium surface view simple squamous epithelium side view
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Tissues page 2 of 5 Observe the slide of simple cuboidal epithelium . These cells are block-like in shape, in side view. In the space below, draw a diagram of simple cuboidal
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histology-lab - Tissues page 1 of 5 ANAT 11110 Fall 2011...

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