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Dr. Genden also transplanted the cricoid, cartilage cuffing the trachea, supplanting Ms. Sein’s completely destroyed cricoid.

Ultimately, the team’s medic performed a surgical cricothyrotomy, in which he would cut into Sergeant Conrad’s neck — at his cricoid membrane — before inserting a tube that would allow unobstructed air to flow into his lungs.

Using a sharp knife, make a half-inch horizontal cut a half-inch deep between the Adam’s apple and the bulge an inch below it, the cricoid cartilage.

On the other hand, the lower end, which rests within the cricoid ring and which was likely to be forced against the mucous membrane of the trachea occasionally, was somewhat thickened to avoid the friction and leverage that might be exerted if there were any free-play allowed.

From their position they are spoken of as postero-superior and antero-inferior; the postero-superior are embedded in the thyroid at the level of the lower border of the cricoid cartilage, while the antero-inferior may be embedded in the lower edge of the lateral lobes of the thyroid or may be found a little distance below in relation to the inferior thyroid veins.