Trachealis is a discontinuous layer of smooth muscle spanning the transverse, posterior deficiency of the C-shaped cartilages within the trachea. The body of the muscle is rich in fibroelastic tissue to aid with elastic recoil.
Trachealis is innervated the autonomic nervous system:
When coughing, trachealis constricts prior to the relaxation of the vocal cords. This increases the pressure within the trachea to make the cough more explosive.
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