Histo lec 16

• Organology


  study of the morphology of the organ systems of the body.
• Organ


  formed by the combination of 1 or more basic tissues of the body.
• Tubular (intestine)

  Parenchymatous (liver)


  Classification of organs (2)
• - Tunica mucosa

  - Tunica submucosa

  - Tunica muscularis

  - Tunica adventitia


  four concentric layers or tunics
• - Lamina ephithelialis mucosae (lining epithelium)

  - Lamina propria mucosa

  - Lamina muscularis mucosae


  3 layers of tunica mucosa
• tunica mucosa


  innermost or luminal coat
• Lamina ephithelialis mucosae (lining epithelium)


  (layer of tunica mucosa) the epithelial layer of an organ
• Lamina ephithelialis mucosae (lining epithelium)


  (layer of tunica mucosa) It is a consistent lamina of this tunic.
• Lamina ephithelialis mucosae (lining epithelium)


  (layer of tunica mucosa) It rests on the basal lamina.
• Lamina ephithelialis mucosae (lining epithelium)


  (layer of tunica mucosa) the connective tissue which underlies the epithelial layer.
• - areolar

  - reticular connective tissue.


  Lamina propria mucosae is usually?
• - small blood vessels and nerves; and

  in some organs

  - may contain lymphatic nodules and

  - glands.


  Lamina propria mucosae contains?
• Lamina propria mucosae


  the connective tissue which underlies the epithelial layer.
• one or more layers of smooth muscle cells

  Lamina muscularis mucosae consist of?
• - inner circular

  - outer longitudinal


  two layers of lamina muscularis mucosae
• Lamina muscularis mucosae


  This lamina is of variable occurrence.
• it serves as a sharp line of demarcation between the connective tissue of the lamina propria mucosae and the tunica submucosa.


  function of Lamina muscularis mucosae when present
• two connective tissues blend together Inseparably when lamina muscularis mucosae is absent

  • lamina propria mucosae
  • tunica submucosa
• Tunica submucosa


  consists of areolar connective tissue which is more coarsely arranged than the connective tissue of the lamina propria mucosae.
• areolar connective tissue which is more coarsely arranged than the connective tissue of the lamina propria mucosae.

  Tunica submucosa consists of?
• - large blood vessels

  - nerve plexi and

  - autonomic ganglia.


  Tunica submucosa contains?
• permits motility of the tunica mucosa.

  function of tunica submucosa
• tunica submucosa and lamina propria


  In the absence of the lamina muscularis mucosae, these two tissue blends
• tunica Mucosa-submucosa


  the t. mucosa and t. submucosa may be collectively called
• Tunica muscularis


  is usually well-developed and consist of two layers of muscles.
• tunica muscularis


  these layers generally consist of smooth muscles, in some organs they may be composed of skeletal muscles.
• circularly


  inner layer of t muscularis is oriented in what manner?
• longitudinally


  outer layer of t muscularis is oriented in what manner?
• - vascular structure

  - neural plexi and

  - autonomic ganglia


  what separates the two layers of tunica muscularis?
• - responsible for the tone of the organ

  - size of the lumen and

  - the movement of materials through hollow organs.


  function of t muscularis
• Tunica adventitia


  a collection of loose connective tissue over the periphery of an organ.
• - Blood vessels

  - nerves

  - ganglia and

  - adipose tissue may be present in this tunic.


  may be present in the Tunica adventitia
• (simple squamous epithelium)


  In organs intimately associated with coelomic cavities, a layer of mesothelium ( ______ ) surrounds the most peripheral tunic.
• tunica serosa


  tunic with a mesothelial investment is called
• - suspension of organs

  - suspension of organs either through the union of the t. adventitia with the surrounding connective tissue or by the reflection of mesothelium and associated connective tissue as mesenteries.


  function of tunica adventitia
• parenchymatous organ


  are composed of a combination of one or more bacic tissues.
• - parenchyma

  - stroma


  two definitive subgroups of the component of parenchymatous
• Parenchyma


  the specific functional component of a specific organ.
• stroma


  includes tissue (connective tissue, vasculature, nerves, lymphatics) that metabolically and or structurally support as well as control the parenchyma.
• - connective tissue

  - vasculature

  - nerves

  - lymphatics


  tissue in the stroma