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Tissue Types. Histology How we examine tissues: Teased, smeared or squashed samples, scraped – we are looking at whole cells

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tissue types

Tissue Types

Histology

How we examine tissues:

Teased, smeared or squashed samples, scraped – we are looking at whole cells

Thin sections – very thin sections of the tissue are made using a microtome after tissue has been either frozen or embedded in some sort of solid substance like wax or plastic –

Staining – In either case stains are used so enhance contrast in the specimen

key terms
Key Terms
  • Histology:
    • the study of tissues.
  • Tissues:
    • groups of cells which are similar in structure and which perform common or related functions.
muscle tissue
Muscle Tissue
  • Muscle tissue is a specialized tissue that are able to contract.
  • Two types of muscle tissue…
      • Voluntary-muscles that you are able to control
      • Involuntary-muscles that you cannot control
skeletal tissue
Skeletal Tissue
  • Skeletal tissue moves bones
    • Most common type of muscle
    • Voluntary muscles
    • Wear out quickly and tire more easily
    • Look branched or striated
    • Example: Tendons-the thick bands of tissue that attach muscle to bone.
cardiac muscle
Cardiac Muscle
  • Found only in the heart
  • Involuntary muscle
  • Contracts an average of 70 per minute each day
  • Cardiac muscle is striated, like skeletal muscle
smooth visceral muscles found in many internal organs
Smooth (visceral) muscles-found in many internal organs
  • Involuntary muscles
  • Contract and relax slowly
  • Appear very branched, spindle-shaped
  • Examples: Blood vessels, bladder, stomach
epithelial tissue
Epithelial Tissue
  • Pack tightly together and form continuous sheets that serve as linings in different parts of the body.
      • A. lines our organs
      • B. ex. Stomach lining and outer layer of skin.
connective tissue
Connective tissue
  • There are many types of connective tissue in the body.
  • Adds support and structure to the body.
  • Some examples include inner layers of skin, tendons, ligaments, cartilage, bone and fat tissue.
  • Blood is also considered a form of connective tissue.
nerve tissue
Nerve Tissue
  • Contains two types of cells: neurons and glial cells.
  • Has the ability to generate and conduct electrical signals in the body.
  • These electrical messages are managed by nerve tissue in the brain and transmitted down the spinal cord to the body.
  • Gives signals to muscles and informs us of environmental conditions (hot, cold, humid)
  • Examples are brain, spinal cord, nerves