73. Metaplasia, pseudomateplasia

Question 1

Define metaplasia

Answer 1

Replacement of a mature, differentiated cell type by another mature , differentiated cell type

Question 2

Metaplasia is only possible on which tissue types?

Answer 2

• Epithelial tissue to epithelial tissue
• Connective tissue to connective tissue

Question 3

Give the forms of metaplasia

Answer 3

• Direct
• Indirect

Question 4

Causes of metaplasia

Answer 4

• Cell damage (but under certain conditions)
  
  • Vit. A deficiency in poultry
  • Irritation of mucous membranes
  • F-2 toxins in the uterus
  • Bone tissue formation in a wound
  • Ossification of the left atrium

Question 5

Pseudometaplasia: Summary

Answer 5

• Appearances mimicking metaplasia
• Different kind of tissue in a certain place
• Originating from choristia

Question 6

Locations of pseudometaplasia with tissue type

Answer 6

• Tonsils → Cartilage
• Gastric mucosa → Oseophagus islets
• Lung → Kidney tissue
• Spinal cord → Portions of intestines
• Vaginal epithelium → Columnar epithelium