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thumbnail trachea h&e 4x thumbnail trachea h&e 10x
thumbnail brown fat near trachea h&e 20x thumbnail trachea h&e 40x

The mouse trachea is a flexible tube connecting the larynx to the primary bronchi and containing several incomplete hyaline cartilage rings whose ends are joined by smooth muscle. The wall of the trachea consists of, from inside to outside, respiratory epithelium, a lamina propria of fibroelastic connective tissue and, at the anterior end of the trachea, glands, the hyaline cartilages covered by perichondrium and connected by smooth muscle, and a connective tissue adventitia. The respiratory epithelium is a ciliated pseudostratified columnar epithelium interspersed with goblet cells. The connective tissue adventitia binds the trachea to adjacent structures.

The 4X micrograph presents cross sections of the trachea and esophagus and shows the incomplete cartilage ring in the trachea and the brown fat present around the trachea and esophagus. The 10X micrograph shows the layers of the tracheal wall. The 20X micrograph illustrates brown fat, which is present around the trachea and the esophagus. In the 40X micrograph details of the respiratory epithelium, lamina propria, perichondrium, and cartilage are visible.

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