Download - Ch. 4 Part 2
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Ch. 4 Part 2
Epithelial tissues
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Epithelial Tissue
• Epithelial tissue or epithelium– Consists of cells arranged in continuous sheets in
either single or multiple layers– Cells are closely packed and held tightly together
by cell junctions– Have various surfaces• Apical (free)• Lateral• Basal
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Epithelial Tissue
• Surfaces– Apical – faces body surface, body cavity,
lumen (interior space), or tubular duct– Lateral – face adjacent cells on all sides;
lateral surfaces contain junctions– Basal – opposite of apical; deepest layer of
cells; adhere to basement membrane; have hemidesmosomes
– Note: apical layer refers to most superficial basal layer refers to deepest layer
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Basement Membrane
• Thin extracellular layer that consists of two layers: basal lamina and reticular lamina– Basal lamina (lamina = thin) – closer to epithelial cells
• Contains proteins: collagen, laminin, glycoproteins, proteoglycans
– Reticular lamina – closer to underlying connective tissue• Contains fibrous proteins (fibroblasts)
• Function: point of attachment and support for overlying epithelial tissue
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Basement Membrane
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Epithelial Tissue Types
• Based on 2 factors: layers and shape• Layers– Simple = single
• Function: diffusion, osmosis, filtration, secretion, absorption– Stratified = layer
• Function: protection from wear and tear– Pseudostratified (pseudo = false)
• Actually simple, but appear stratified because of nuclei arrangement
• Function: ciliated, secrete mucus
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Epithelial Tissue Types• Shape
– Squamous• Arranged like floor tiles, thin• Function: rapid passage of substances
– Cuboidal• Shaped like cubes or hexagons• Function: secretion or absorption
– Columnar• Taller than wide, like columns• Function: protection, secretion or absorption
– Transitional• Change shape from flat to cuboidal• Function: stretch (urinary bladder)
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Epithelial Tissue Types
• Combine layers with shape to get all epithelial tissue types (plus some extra)– Ciliated – have cilia
• Simple squamous, simple cuboidal, simple columnar, pseudostratified columnar
• Stratified squamous, stratified cuboidal, stratified columnar, transitional– Keratinized – contains keratin (protein)
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Epithelial Tissue Types
• Red book p. 113 – 117• Blue book p. 100-105
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Simple Squamous
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Simple Cuboidal
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Nonciliated Simple Columnar
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Ciliated Simple Columnar
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Pseudostratified Columnar
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Stratified Squamous
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Stratified Cuboidal
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Stratified Columnar
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Transitional
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Checkpoint
• Describe the various layering arrangements and cell shapes of epithelium.
• What characteristics are common to all epithelial tissues?