Focus: Identify the cells using the correct Epithelium classification:

Focus:

• Identify the cells using the correct Epithelium classification:

Specialized Structures

Simple Squamous Epithelium

Simple Cuboidal

Simple Columnar

Goblet Cells in simple columnar

Pseudostratified Columnar

Stratified Squamous

Stratified squamous (Tongue)

Transitional Epithelium (Bladder)

Today’s Objectives

• Classify types of Connective Tissue

• Identify chief locations of each type of connective tissue

• Compare/Contrast connective tissue to epithelial tissue

Connective Tissue: CharacteristicsConnective Tissue: Characteristics

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Found everywhere in the body

Includes the most abundant and widely distributed tissues

Functions

Binds body tissues together

Supports the body

Provides protection

Where located

• Commonly found under epithelium

Special CharacteristicsSpecial Characteristics

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Variations in blood supply

vascularized

avascular

Extracellular matrix

Non-living material that surrounds living cells

Extracellular MatrixExtracellular Matrix

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Two main elements Ground substance – mostly water along

with adhesion proteins and polysaccharide molecules

Fiber Three types of fibers

Collagen fibers- thick, appear parallel, and are stron. Not stretchy

Elastic fibers- cells spaced apart, stretchy

Reticular fibers-

Connective Tissue Types-LabConnective Tissue Types-Lab

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1) Bone (osseous tissue) Composed of:

Bone cells in lacunae (cavities)

Hard matrix of calcium salts (make rigid)

Large numbers of collagen fibers

Used to protect and support the body

Connective Tissue Types-LabConnective Tissue Types-Lab

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

2) Hyaline cartilage Most common

cartilage

Composed of:

Abundant collagen fibers

Covers bone and joints

Entire fetal skeleton is hyaline cartilage

Figure 3.18b

Connective Tissue Types-LabConnective Tissue Types-Lab

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

3) Dense connective tissue Main matrix element is

collagen fibers

Cells are fibroblasts

Examples Tendon – attach muscle

to bone

Ligaments – attach bone to bone

Connective Tissue Types-LabConnective Tissue Types-Lab

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

4.) Adipose tissue Matrix is an areolar

tissue in which fat globules predominate

Many cells contain large lipid deposits

Functions Insulates the body

Protects some organs

Serves as a site of fuel storage

Connective Tissue Types-LabConnective Tissue Types-Lab

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

5) Blood

Blood cells surrounded by fluid matrix

Fibers are visible during clotting

Functions as the transport vehicle for materials

Connective Tissue TypesConnective Tissue Types

Slide 3.58a

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

6) Elastic cartilage

Provides elasticity

Example: supports the external ear

Connective Tissue TypesConnective Tissue Types

Slide 3.58b

Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

7) Fibrocartilage

Highly compressible

Example: forms cushion-like discs between vertebrae

Figure 3.18c

Connective Tissue TypesConnective Tissue Types

Slide 3.60Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

8) Areolar connective tissue Most widely

distributed connective tissue

Soft, pliable tissue

Contains all fiber types

Can soak up excess fluid Figure 3.18e

Connective Tissue TypesConnective Tissue Types

Slide 3.62Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings

9) Reticular connective tissue Delicate network of

interwoven fibers

Forms stroma (internal supporting network) of lymphoid organs Lymph nodes Spleen Bone marrow

Figure 3.18g

Epithelial membranes - combinations of epithelial and

connective tissues which have specific functions • Serous membranes - combined simple squamous

epithelium and areolar connective tissue. – Secretes serous fluid as a lubricant for sliding of the tissues. – Found as the pericardial sack which prevents friction when the

heart beats, pleural membranes around the lungs,mesenteries attaching the intestines, peritoneum lining the abdominal cavity and covering its organs.

• Mucous membranes - combined of columnar (may be ciliated or p.c.c.e.) epithelium and areolar connective and smooth muscle.– Forms the structure of the GI and respiratory passageways.– Specialized glands, or cells called goblet cells, secrete mucus to

protect the lining, lubricate the propulsion of food, and remove particulates form the respiratory tract.

Microscope ClassificationLab #3 part two

• Each person should have a Hand out• Match-the pictures to the correct slide

(label the correct type of connective tissue)

• Sketch-portion of tissue to show the structure

• Label- tissue type, power and Field Diameter

• Write-function and location of tissue in human body

Place the following in the correct place on the Ven Diagram

1. Cells packed together2. Individual cells3. Extracellular matrix4. Throughout body5. Protection 6. Binds tissue together7. Support8. Avascular9. Vascular10. Cover 11. Filler12. Apical surface13. Basement membrane

ConnectiveTissue

Epithelial Tissue

• Cells packed together= epi• Individual cells= conn• Extracellular matrix= conn• Throughout body= both• Protection =both• Binds tissue together= conn• Support= both• Avascular= both• Vascular= Conn• Cover= epi • Filler= con• Apical surface= epi• Basement membrane= epi