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Pseudostratified epithelium
Hint: Pseudostratified epithelium is the only type with cilia (which looks like hair/fuzz). If you see hairs on the slide, its pseudostratified! |
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the arrow is pointing to simple squamous epithelium.
notice the nucleus is a stretched out oval looking thing |
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| Simple Columnar Epithelium |
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Definition
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Simple Squamous Epithelium
(lung tissue) |
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Simple Cuboidal Epithelium
(thyroid) |
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| Simple squamous epithelium: This shows single layers of squamous (flat) cells around the air spaces (alveoli) of the lung. A single layer of flat cells is the best arrangement when diffusion is the major function of an epithelial tissue. In this case, oxygen and carbon dioxide diffuse across. |
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| simple cuboidal epithelium |
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Transitional Epithelium
Cells of transitional epithelium are large and plump when the bladder is empty. When the bladder is full, they become flattened. Occasionally, a binucleate cell (black arrow) can be seen. Notice the infiltrate of lymphocytes (blue arrows) and an increased density of staining along the apical surface of the most superficial layer of epithelial cells. |
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Simple Squamous
Kidney (Glomerulus)
Simple squamous epithelium (arrow) lines the glomerulus. This is an H & E section and nuclei are blue. |
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Simple Cuboidal epithelium
thyroid gland |
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Simple Cuboidal epithelium
of the kidney collecting duct |
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simple columnar epithelium
gall bladder |
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| Simple columnar epithelium |
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Pseudostratified Columnar
Trachea
The pseudostratified columnar epithelium of the trachea is ciliated and has goblet cells. |
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Transitional epithelium
Urinary Bladder
The expandible stratified epithelium of the bladder is referred to as transitional epithelium. Note that its surface cells are large rather than flattened as in stratified squamous epithelium. |
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Definition
Stratified Squamous
Lip
Stratified squamous keratinizing epithelium covers the lip. Note the thin flat shape of surface cells. The keratin layer is very thin, and is not visible on this section. |
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Stratified squamous
Vagina
Stratified squamous non-keratinizing epithelium lines the vagina. Note that the surface is to the upper right and that the underlying connective tissue is not visible in this field. |
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Stratified Squamous
Thin Skin
The stratified squamous (keratinized) epithelium of thin skin has thin layers of keratin on the upper surface. Note that the epithelium rests on connective tissue below (light pink). |
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Skeletal Muscle
Skeletal Muscle
Longitudinal skeletal muscle is non-branching and can be identified by peripheral nuclei. The large white vertical lines are knife marks from sectioning (artifact). |
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Skeletal Muscle
At higher magnification, the striations become visible. I-bands (isotropic) are light while A-bands (anisotropic) are dark. |
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Smooth Muscle
Longitudinal smooth muscle is identified by long, thin central nuclei, a more scattered tissue layout, and an absence of striations. |
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Cardiac Muscle
Longitudinal cardiac muscle can be identified by centrally placed round to oblong nuclei, striations, branching, and intercalated discs (arrow). |
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Slide 15 Cardiac Muscle
This photomicrograph of the same tissue taken in phase shows the striations and intercalated disks (arrows) more clearly. |
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cells of connective tissue
wont be asked on the test in this much detail, but it is good to know because in each individual slide you can identify these structures and it will help identify that particular tissue. |
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Definition
1. Fibroblasts These are the stars of the connective tissue show. They manufacture and maintain the extracellular material. Fibroblasts migrate throughout the ECM wherever they are needed, such as scar formation. By the way, the fibroblast is actually a misnomer since it is a mature cell (not a precursor).
2. Adipocytes These cells are (unfortunately at times) extremely effecient at storing energy in the form of triglycerides. Exercise all you want, but you'll still have the same number of adipocytes. But don't cancel you membership to the gym just yet because each cell will, of course, decrease in size.
3. Blood Blood is actually a connective tissue which is covered quite extensively in the Blood and Lymphoid sections. Remember that the immune cells extravasate into the ECM when responding to foreign invasion. |
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