Answers

  1. #33 Junction of Esophagus and Stomach, Human.
    How can you diagnose whether you are looking at the upper or lower portion of the esophagus? By the presence and/or proportion of skeletal muscle.
  2. #35 Stomach and Duodenum
    To what ultrastructural feature does the striated border correspond? Microvillus border.
  3. #101a (PAS) Small Intestine
    In the lamina propria there are macrophages with irregular-sized PAS-positive inclusions. There are also mast cells. What accounts for the intense PAS-positivity of these cells? Carbohydrate groups

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