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The larynx extends from the pharynx to the trachea; the epiglottis is located at the border of the larynx and pharynx (see Diagram of Upper Respiratory System – In Situ). The wall of the larynx is formed by, from inside to outside, respiratory epithelium, a lamina propria rich in elastic fibers and glands, cartilages and vocal cords, and loose connective tissue adventitia. The respiratory epithelium is a ciliated pseudostratified columnar epithelium interspersed with goblet cells. The glands in the lamina propria are serous, mucous, and mixed glands with short ducts lined by ciliated cuboidal epithelium. The cartilages to which the vocal cords are attached are elastic, all other laryngeal cartilages are hyaline. Fibrous connective tissue and skeletal muscle connect the laryngeal cartilages to each other and to adjacent structures.
The 4X micrograph depicts the larynx cavity lined by respiratory epithelium. The 4X and 10X micrographs show the cartilage and skeletal muscle in the larynx wall as well as the glandular acini in the lamina propria. The 20X micrograph presents the serous and mucous glandular acini in detail. The 40X micrograph offers details of the respiratory epithelium, the lamina propria, and the cartilage.
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