GLANDULAR EPITHELIUM

					     Epithelium


    Simple Columnar   Simple Cubodial
                                        Pseudostratified columnar




                                            Stratified Squamous/
                         Transitional       Stratified Cubodial/
Stratified Squamous                         Fibrous Connective
GLANDULAR EPITHELIUM

        Endocrine glands,
  unicellular exocrine glands, &
  multicellular exocrine glands
Glands are classified as :
   ENDOCRINE or EXOCRINE
    depending on their route of secretion
ENDOCRINE GLANDS
   products, called hormones, are secreted
    directly into the blood
   No ducts
   Under the microscope, they look like any
    stratified epithelial tissues with one big
    difference: THEY DO NOT HAVE A FREE
    SURFACE.... and are surrounded directly
    by other tissues.
ENDOCRINE GLANDS
ENDOCRINE GLANDS
     EXOCRINE GLANDS

   release their products onto the free
    surface of the skin or of the open
    cavities of the body such as the
    digestive, respiratory or reproductive tracts.
    Their products are NOT released into the
    blood.
EXOCRINE GLANDS
1. Unicellular
2. Multicellular
    A.) simple (one unbranched
     duct) sweat gland
    B.) compound (branched
     ducts) parotid gland
Unicellular glands
   They are scattered amongst other non-
    secretory epithelial cells
   They have no ducts, but they secrete
    their products directly on the free
    surface
   The most common unicellular exocrine
    glands are the goblet cells (mucus
    secreting cells)
Unicellular glands
Multicellular glands
(multicelled glands)

    duct connecting them to the free
    surface of the epithelial sheet
Multicellular glands
    develop from covering epithelia by
     invagination
    epithelium grows down from the surface into
     the underlying tissues to form a simple or
     branched tube
    ends of these tubes constitute the secretory
     parts of the gland
    Simple Tubular
                      Simple Coiled Tubular        Exocrine gland types




Simple Branched Tubular     Simple Branched Alveolar




  Compound Tubular             Compound Alveolar
Glands

   Release their secretions
    in different ways
       Types of Glandular Secretions
   Merocrine gland-
    a.) Keeps all of their
        cytoplasm
    b.) Exocytosis
    c.) most common
    Salivary glands, pancreatic
    glands, certain sweat
    glands
    mucus (dig, resp)
      Types of Glandular Secretions
   Apocrine gland-
    A.) Loss of cytoplasm +
        secretory product

    B.) growth and repair

    C.) mammary glands,
        certain sweat glands
    Underarm perspiration
      Types of Glandular Secretions
   Halocrine gland-
    A.) Loss of entire cell +
    secretory product

    B.) cell bursts and dies

    C.) Sebaceous glands of
    the skin, waxy coating of
    hair
Glandular Epithelium



                  Unicellular Exocrine




Endocrine Gland


                       Multicellular Exocrine

				
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