Home   Chapter Home   Jobs   Conferences   Fellowships   Books



Normal histology

Reviewer: Adriana Handra-Luca, M.D. (see Reviewers page)
Revised: 3 February 2013, last major update October 2012
Copyright: (c) 2003-2013, PathologyOutlines.com, Inc.


● Composed of imperfect rings of hyaline cartilage, fibrous tissue, muscular fibers, mucous membranes and glands


● 16-20 imperfect rings, with circular cartilaginous defect posterior, and replaced by fibrous tissue and muscular fibers
● Each cartilage is 4 mm in depth, 1 mm in thickness
● Are elastic, but may be calcified later in life

Fibrous tissue:
● Thick layer covers outer surface of cartilaginous ring, thin layer covers inner surface
● Both layers merge at upper and lower margins of cartilaginous rings

Muscular tissue:
● Longitudinal and transverse layers of smooth muscle

Mucus membrane:
● Continuous with laryngeal and bronchial membranes
● Ciliated columnar epithelium overlying areolar and lymphoid tissue with elastic fibers, blood vessels, nerves, mucous glands


Transverse section

Micro images

Transverse section

Various images

End of Trachea > Normal histology

This information is intended for physicians and related personnel, who understand that medical information is often imperfect, and must be interpreted in the context of a patient's clinical data using reasonable medical judgment. This website should not be used as a substitute for the advice of a licensed physician.

All information on this website is protected by copyright of PathologyOutlines.com, Inc. Information from third parties may also be protected by copyright. Please contact us at [email protected] with any questions (click here for other contact information).