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General Histology

  1. Gap junctions permit cell-to-cell communication of small molecules via their connexon channels.
  2. Bullous pemphigoid is an autoimmune disease. Affected individuals form antibodiesagainst their own hemidesmosomes.
  3. The oral portion of epiglottis is lined by stratified squamous epithelium.
  4. Thyroid follicles are normally lined by cuboidal epithelium, but they become columnar when stimulated and squamous when inactive.
  5. Only the male urethra contains transitional epithelium (in the prostatic portion). Stratified squamous epithelium lines most of the female urethra and the distal end of the cavernous urethra in males.
  6. Membranous urethra is lined by stratified (or pseudo-stratified) columnar epithelium.
  7. The vagina lacks glands and is lubricated by secretions from cervical glands. It is lined by a stratified squamous non-keratinized epithelium with cells that release glycogen (lactic acid).
  8. The olfactory epithelium (neuroepithelium) possesses nonmotile cilia, which act as receptors for odor. They are extensions of the bipolar nerve cells that form part of this tall, pseudo-stratifiedepithelium located in the roof of the nasal cavity.
  9. Terminal bronchioles arelined by an epithelium composed of two cell types: secretory (Clara) cells and ciliatedcells. Cartilage is not present in bronchioles.
  10. Mucous neck cells are located in the neck of gastric glands in all parts of the stomach, whereas chief (zymogenic) cells are present mostly at fundus of gastric glands and mostly at the fundus part of stomach.
  11. Pericytes are pluripotential (stem) cells that resemble fibroblasts, although they are adjacent to capillaries (Peri-endothelial).
  12. Hyaline cartilage is avascular, contains type II collagen. It is located at the articulating ends of long bones.
  13. Elastic cartilage (also called yellow cartilage) is present in the outer Ear (pinna), Eustachian tube, and Epiglottis (E3)
  14. Intervertebral disc is an example of fibro-cartilage.
  15. Gut Associated Lymphoid Tissue (GALT) is present in the Lamina propria of Mucosa.
  16. Hassall corpuscles are concentric accretions of epithelial reticular cells (derived fromendoderm) found only in the medulla of the thymus
  17. Langerhans cells in the epidermis function as antigen-presenting cells by trappingantigens that penetrate the epidermis and transporting them to regional lymph nodes, where they are presented to T lymphocytes. They originate in the bone marrow and do not arise from epithelium.
  18. Cardiac muscle cells are joined together end to end by a unique junctional specialization called the intercalated disk.
  19. Prostate gland has fibromuscular stroma.

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