L-32 Histology of the Respiratory System 2.xml

L-32 Histology of the Respiratory System 2.xml - Lecture...

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Lecture 32. Histology of the Respiratory System 2 Lecture 32. Histology of the Respiratory System 2 Lecture 32. Histology of the Respiratory System 2 H. Warshawsky Dr. Morales Conducting Elements 1. Trachea 2. Bronchus 3. Bronchioles 4. Terminal brochioles There are approximately 15-20 branchings in humans, therefore, 2 20 → 10 6 terminal branches. Trachea Large tube beginning at the larynx and descending to a bifurcation forming the bronchi. Wall is supported by 16-20 C-rings of hyaline cartilage. The spaces between the cartilage is filled with rather dense fibroelastic connective tissue (this is where you aim when doing a tracheotomy). 1. Epithelium pseudostratified columnar ciliated epithelium with goblet cells. patches can change to stratified squamous cells in smokers (epithelial metaplasia). 2. Lamina propria loose connective tissue rich in elastic fibres 3. Submucosa
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Lecture 32. Histology of the Respiratory System 2 Lecture 32. Histology of the Respiratory System 2 denser connective tissue rich in elastic fibres C-ring of hyaline cartilage containing type II collagen. space between C-rings filled with fibroelastic CT. serous and mucous glands which open into lumen 4. Adventitia connective tissue that binds trachea to other structures. Bronchus Each bronchus is made of two parts; an extrapulmonary bronchus (surrounded by adventitia, which binds it to the mediastinum), and an intrapulmonary bronchus (surrounded by lung tissue). Bronchi no longer have C-rings of cartilage, they have a number of small plates of hyaline cartilage.
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L-32 Histology of the Respiratory System 2.xml - Lecture...

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