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Ch. 4 Part 2. Epithelial tissues. 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

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ch 4 part 2

Ch. 4 Part 2

Epithelial tissues

epithelial tissue
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
epithelial tissue1
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
basement membrane
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
epithelial tissue types
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
epithelial tissue types1
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)
epithelial tissue types2
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)
epithelial tissue types3
Epithelial Tissue Types
  • Red book p. 113 – 117
  • Blue book p. 100-105
checkpoint
Checkpoint
  • Describe the various layering arrangements and cell shapes of epithelium.
  • What characteristics are common to all epithelial tissues?