Histology Chapter 1 Review Flashcards

Stratified Epithelial Tissues

• Stratified Cuboidal Epithelium (Figure 1.9)

  • Specimen Source: Sweat gland in the dermis.

  • Magnification: $1000\times$.

  • Key Visual Components:

    • Stratified cuboidal epithelium: Represents multiple layers of cube-shaped cells.

    • Nuclei: Clearly visible within the cell layers.

• Stratified Columnar Epithelium (Figure 1.10)

  • Specimen Source: Duct in the parotid gland.

  • Magnification: $1000\times$.

  • Identified Cell Types and Structures:

    • Stratified columnar epithelium: The overall tissue structure consisting of multiple layers.

    • Columnar epithelial cell: The elongated cells located at the apical (top) surface.

    • Cuboidal basal cell: The smaller, cube-shaped cells located at the base of the tissue.

    • Nuclei: Prominent within both the cuboidal and columnar cell layers.

Transitional Epithelium

• Transitional Epithelium (Figure 1.11)

  • Specimen Source: Urinary bladder.

  • Magnification: $1000\times$.

  • Structural Specializations:

    • Transitional epithelium: A specialized stratified tissue capable of stretching.

    • Umbrella cell: Characteristic large, dome-shaped cells found at the apical surface.

    • Nuclei: Multiple nuclei observed within the epithelial layers.

    • Basement membrane: The extracellular layer that anchors the epithelium to the underlying connective tissue.

Loose Connective Tissues

• Areolar Connective Tissue (Figure 1.12)

  • Specimen Source: Mesentery.

  • Magnification: $400\times$.

  • Microscopic Details:

    • Fibroblast nucleus: The nuclei of the cells responsible for secreting fibers.

    • Collagen fibers: Thick, robust fibers providing tensile strength.

    • Elastic fibers: Thin, branching fibers that provide flexibility and recoil.

• Adipose Tissue (Figure 1.13)

  • Specimen Source: Hypodermis.

  • Magnification: $400\times$.

  • Composition:

    • Adipocytes (fat cells): Large cells specialized for lipid storage.

    • Nuclei: Peripheral nuclei pushed to the edges of the adipocytes by the large central lipid droplet.

• Reticular Connective Tissue (Figure 1.14)

  • Specimen Source: Lymph node.

  • Magnification: $1000\times$.

  • Structural Feature:

    • Reticular fibers: A network of thin, branching fibers providing a structural framework for organs like lymph nodes.

Dense Connective Tissues

• Dense Regular Connective Tissue (Figures 1.15 & 1.16)

  • Specimen Source: Tendon.

  • Low Power Magnification ($100\times$):

    • Shows the relationship between the dense regular connective tissue (tendon) and adjacent skeletal muscle.

  • High Power Magnification ($400\times$):

    • Dense regular connective tissue: Parallel arrangement of fiber bundles.

    • Collagen fibers: Closely packed, parallel bundles that provide high resistance to tension in one direction.

    • Fibroblast nuclei: Flattened nuclei squeezed between the dense collagen bundles.

    • Skeletal muscle: Visible in the surrounding context of the tendon.

• Dense Irregular Connective Tissue (Figure 1.17)

  • Specimen Source: Dermis, Thick Skin.

  • Magnification: $400\times$.

  • Key Components:

    • Fibroblast nuclei: Present throughout the tissue.

    • Collagen fibers: Thick fibers arranged in an irregular, non-parallel fashion to provide strength in multiple directions.