Tissues

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Tissues
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What are the four main types or categories of
tissues?

1. Epithelial Tissue
2. Connective Tissue
3. Muscular Tissue
4. Nervous Tissue

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Epithelium

• A primary tissue that covers the body surfaces
  and lines body cavities
• Its cells are arranged in sheets
• Forms glands
• Named according to
• 1) the number of layers
• 2) the shape of the cells at the free surface

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Where is simple squamous epithelium located?

• Alveoli of the lungs
• Serous membranes
• Lining the lumina of blood vessels where it is
  also termed endothelium

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Specific name of this tissue?
Simple Cuboidal Epithelium
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What are two special features?
Spherical and centrally-located nuclei
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What are its three main functions?

1. Secretion
2. Absorption
3. Protection

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Where is this tissue located?

1. Small ducts
2. Small glands
3. Small tubules (kidney tubules)
4. Thyroid gland

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What kind of epithelial tissue is this?
Simple Columnar Epithelium
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What are two special features?
Columnar shaped cells
Round or oval cells near basal membrane
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What are its three main functions?

• Secretion
• Digestion
• Absorption of nutrients
• Transportation of substances

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Where is this tissue located?

1. Stomach
2. Small Intestine
3. Cecum
4. Large Intestine
5. Rectum (colon)
6. Appendix
7. Collecting ducts of kidneys

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What kind of tissue is this?
Ciliated pseudostratified columnar epithelium
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What are three special features?
Goblet cells
Cilia
Nuclei at different levels
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What are its three main functions?

1. Secretion of mucus
2. Propulsion, moving things
3. Protection

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Where is this tissue located?

1. Mucosa of trachea
2. Vas deferens
3. Fallopian tubes
4. Epidydimus

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Specific name of this tissue?
Stratified squamous epithelium
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What are two special features?
Central nuclei
Multilayered
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What is the main function of this tissue?
Protection
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Where is this tissue located?

1. Skin
2. Scalp
3. Lining of mouth
4. Esophagus
5. Ear Canal
6. Anal canal
7. Vagina

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What kind of epithelial tissue is this?
Stratified cuboidal epithelium
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What is its special feature?
Generally two layers of cube-like cells
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What are its two main functions?

• Protection
• Secretion

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Where is this tissue located?

• In the largest ducts of
• Sweat glands
• Mammary glands
• Salivary glands

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What kind of epithelial tissue is this?
Transitional epithelium
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What is its main special feature?
Teardrop-shaped cells nearest the lumen are
larger than the cells at the stratum germinativum
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What is its main function?
Stretching
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Where is this tissue located?

1. Urinary bladder
2. Renal pelvis
3. Ureters