Stroboscopy Anatomy

Stroboscopy allows imaging of the vocal cords and the larynx in high resolution. Using a microphone placed on the neck, light is flashed in synchronicity with the vibrations of the vocal cords. The image is through a rod and mirror system slid along the tongue and connected to a high-resolution video camera. Stroboscopy is an excellent way to display the inner larynx, and for showing the distinction between the true and false vocal cords during phonation (cords closed) and full vocal cord abduction (breathing).

True vocal cords are marked with asterisks (*).

False vocal cord (a mucosal fold) on right side is marked with arrowheads.

Epiglottis is the blurred structure (+) at bottom of lower two images.

Posterior cartilages (PC) are rounded structures at top of bottom right image.

Tracheal rings are visible in top two images (especially top right image) between the true vocal cords. 

In the bottom two images, the interarytenoid notch is a small vertical cleft with the cords and posterior cartilages adducted. In top left image, with full vocal cord abduction, the interarytenoid notch has a broad and flat appearance.

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