Cadaver sample
An equine larynx/hyoid specimen from a harness racehorse was acquired to
explain the cause of this unusual disorder (Figure 5). When manual
pressure was applied on the thyrohyoid bone (only) approximately 1 cm
distal to the articulation between the thyrohyoid bone and thyroid
cartilage (thyrohyoid articulation) a similar compression of the base of
the epiglottis (Figure 5 bottom right) as witnessed videoendoscopically
was created. This compression visually obscures the vocal folds as the
base of the epiglottis narrows and forms a U-shape.