Anaphy 12 Final

All from Iya's canva

Simple Squamous Epithelium

• Structure:

  • Single layer of flat, thin cells

  • Centrally located, flat nucleus (resembles a fried egg)

Simple Squamous Epithelium

• Function:

  • Forms the thinnest possible barrier

  • Allows rapid diffusion and membrane transport of
    molecules and ions

  • Secretions in serous membranes

Simple Squamous Epithelium

• Location:

  • Air sacs (alveoli) of the lungs

    • Ideal for gas exchange between air and blood
      (oxygen & carbon dioxide)

  • Lining of lumen of blood vessels and lymph vessels
    (endothelium)

  • Serous membranes of body cavities (mesothelium)

Simple Cuboidal Epithelium

• Structure:

  • Single layer of cells as tall as they are wide

  • Spherical, centrally located nucleus

Simple Cuboidal Epithelium

• Function:

  • Absorption and secretions

  • Forms secretory tissue of most glands and small
    ducts

Simple Cuboidal Epithelium

• Location:

  • Linings of kidney tubules

  • Thyroid gland follicles

  • Surface of ovary

  • Secretory regions and ducts of most exocrine glands

Nonciliated Simple Columnar Epithelium

• Structure:

  • Single layer of nonciliated cells as tall as they are
    wide

  • Oval-shaped nucleus oriented lengthwise in basal
    region of cell

  • Apical surface may have microvilli

  • May contain goblet cells

Nonciliated Simple Columnar Epithelium

• Function:

  • Absorption and secretions

• Location:

  • Lining of most of gastrointestinal (digestive) tract
    (stomach, SI, and LI)

Nonciliated Simple Columnar Epithelium

• Location:

  • Lining of most of gastrointestinal (digestive) tract
    (stomach, SI, and LI)

Ciliated Simple Columnar Epithelium

• Structure:

  • Single layer of ciliated cells as tall as they are wide

  • Oval-shaped nucleus oriented lengthwise in basal
    region of cell

  • May contain goblet cells

Ciliated Simple Columnar Epithelium

• Function:

  • Secretion of mucin and movement of mucus along
    apical surface of epithelium by cilia

  • Oocyte movement through uterine tube

Ciliated Simple Columnar Epithelium

• Location:

  • Lining of larger bronchioles (air passageways) of the
    lung and the uterine tubes

Ciliated Pseudostratified Columnar Epithelium

Ciliated Pseudostratified Columnar Epithelium

• Structure:

  • Single layer of cells with varying heights

  • All cells connect to basement membrane, but not all
    cells reach apical surface

  • Has goblet cells and cilia

Ciliated Pseudostratified Columnar Epithelium

Ciliated Pseudostratified Columnar Epithelium

• Function:

  • Protection

  • Secretion of mucin and movement of mucus along
    apical surface of epithelium by cilia

Ciliated Pseudostratified Columnar Epithelium

• Location:

  • Lining of larger airways of respiratory tract, including

    • nasal cavity

    • part of pharynx

    • parts of larynx

    • trachea

    • bronchi

Nonciliated Pseudostratified Columnar Epithelium

• Structure:

  • Single layer of cells with varying heights

  • All cells connect to basement membrane, but not all
    cells reach apical surface

  • Lacks goblet cells and cilia

Nonciliated Pseudostratified Columnar Epithelium

• Function:

  • Protection

• Location:

  • Rare- lining of part of the male urethra and epididymis

Keratinized Stratified Squamous Epithelium

• Structure:

  • Multiple cell layers

  • Basal cells are cuboidal or polyhdeal and alive

  • Apical cells are squamous

    • Lacks nucleus and organelles

    • Filled with protein keratin

    • Dead

Keratinized Stratified Squamous Epithelium

• Function:

  • Protection of underlying tissue from abrasion

• Location:

  • Epidermis of skin

Non-keratinized Stratified Squamous Epithelium

• Structure:

  • Multiple cell layers

  • Basal cells are cuboidal or polyhdeal

  • Apical cells are squamous and kept moist

  • All cells are

    • living

    • contains a nucleus and organelles

    • lacks keratin

Non-keratinized Stratified Squamous Epithelium

• Function:

  • Protection of underlying tissue from abrasion

• Location:

  • Lining of oral cavity

  • Part of pharynx

  • Part of larynx

  • Esophagus

  • Lining of vagina

  • Anus

Stratified Cuboidal Epithelium

• Structure:

  • Two or more layers of cells

  • Cells at the apical surface are about as tall as they are
    wide

Stratified Cuboidal Epithelium

• Function:

  • Protection and secretion

• Location:

  • Ducts of most exocrine glands and ovarian follicles

Stratified Columnar Epithelium

• Structure:

  • Two or more layers of cells

  • Cells at apical surface are taller than they are wide

Stratified Columnar Epithelium

• Function:

  • Protection and secretion

• Location:

  • Large ducts of salivary glands

  • Conjunctiva covering the eye

  • Lining of the membranous part of male urethra

Transitional Epithelium

• Structure:

  • Epithelial appearance varies,
    depending upon whether tissue is
    relaxed or distended (stretched)

    • Relaxed: cuboidal or polyhedral
      cells and apical cells are large
      and rounded

    • Distended: flattened cells at
      apical surface

  • Some cells are binucleated

Transitional Epithelium

• Function:

  • Accomodates urine volume changes
    (by distending or relaxing) in the
    urinary bladder, ureters, and part of
    urethra)

• Location:

  • Lining of urinary bladder, ureters,
    and part of urethra