Tissues Four major tissue types 1 Epithelium 2

Tissues • Four major tissue types 1. Epithelium 2. Connective 3. Muscle 4. Nervous 3/4/2021 1

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Classification of Epithelial Tissues • Two simple rules 1. Shape of cells (always check the most superficial layer) • • Squamous (plate-like) Cuboidal Columnar Pseudostratified (appears to be multiple layers) 2. Number of layers • • • 3/4/2021 Simple (one layer) Stratified (more than one layer) Transitional (cells change shape) 3

Simple Epithelium • Simple squamous • Simple cuboidal • Simple columnar • Pseudostratified

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Simple Squamous 3/4/2021 6

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Simple Cuboidal 3/4/2021 22

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Simple Columnar 3/4/2021 27

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Pseudostratified Columnar 3/4/2021 33

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Stratified Epithelium • Stratified squamous • Stratified cuboidal • Stratified columnar (rare) • Transitional

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Stratified Cuboidal 3/4/2021 51

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Transitional 3/4/2021 55

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Stratified Columnar 3/4/2021 60

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• Connective Tissues 1. 2. 3. 4. 5. 6. 7. Loose or areolar Dense irregular Dense regular Elastic Reticular Adipose Cartilage • • • Hyaline Elastic Fibrocartilage 8. Blood 9. Bone 3/4/2021 63

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Loose (Areolar) Connective Tissue 3/4/2021 66

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Dense Irregular Connective Tissue 3/4/2021 75

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Dense Regular Connective Tissue 3/4/2021 80

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Elastic Connective Tissue 3/4/2021 85

Elastic Connective Tissue • Relatively rare • But relatively high concentration in several organs including the largest arteries • This image shows a portion of the wall of the aorta • Elastin fibers important in the recoil of organs like arteries and lungs 3/4/2021 86

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Reticular Connective Tissue 3/4/2021 90

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Adipose Tissue 3/4/2021 94

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Hyaline Cartilage 3/4/2021 98

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Elastic Cartilage 3/4/2021 103

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Fibrocartilage 3/4/2021 107

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Blood 3/4/2021 113

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Bone 3/4/2021 116

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Striated or Skeletal 3/4/2021 122

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Cardiac 3/4/2021 132

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Smooth 3/4/2021 140

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Nerve Cell 3/4/2021 150

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Neuron 3/4/2021 153