Vocal cord flaccidity correlates to some degree with atrophy of the muscle comprising them. Bowing also accompanies flaccidity most of the time. It is possible to have bowed/slender vocal cords that are not particularly flaccid—they still vibrate with good firmness and resilience. Similarly, vocal cords that appear to have good bulk (and are not atrophied) can nevertheless have a flaccid vibratory pattern. Photos below show the visual findings of flaccidity as distinct from bowing and atrophy. Voice manifestations of flaccid vocal cords are similar to bowing in cases such as:
- Loss of “edge”
- Reduced ability to be heard in noisy places
- Reduced vocal endurance (The voice becomes fuzzier or raspier and more air-wasting as the day progresses and the atrophied muscles tire).
Vocal Cords (1 of 5)
This woman in her sixties is experiencing loss of vocal strength. Her voice becomes raspier as the day progresses. Under standard light during voicing at her average pitch for speech, F3 (175 Hz), vibrating cords have blurred margins. Notice that the gap at the anterior vocal cords is wider (arrow) than between the rest of the cords. This anterior gap is a typical finding of flaccidity.
Vocal Cords (2 of 5)
Still at her habitual pitch for speech, F3 (175 Hz), the closed phase is not closed at all! And again, the gap is wider anteriorly. This incomplete closure explains her air wasting, fuzzy voice quality.
Vocal Cords (3 of 5)
Again at F3, the open phase shows remarkable amplitude of vibration (lateral excursion); the cords are so flaccid that they must travel very far laterally before they develop enough recoil to return to the position in photo 2.
Vocal Cords (4 of 5)
Higher pitch lengthens the vocal cords (stretches them longitudinally, making them less flaccid: think “rubber band”) Yet under strobe light at C4 (252 Hz), that telltale small gap is still seen anteriorly during closed phase of vibration.
Flaccid vocal cords (2 of 4)
Vibratory blur with standard light. Note relatively wide "gray" zone of blur.
Flaccid vocal cords (3 of 4)
Dramatic lateral excursions due not only to bowing, but also flaccidity.
Flaccid vocal cords (2 of 3)
Maximum closed phase, but with persistent open area anteriorly (at arrow) If this area of exaggerated flaccidity oscillates independently, a rough quality is added to the voice.
Vocal cord bowing (1 of 4)
Open phase vibration, strobe light. Notice the large amplitude of vibration. The wide lateral excursions suggest flaccidity, especially when this is seen in middle voice.
Vocal cord bowing (2 of 4)
Partially closed phase, strobe light. Notice that the anterior cords are more flaccid, with delayed return to midline contact. When this is seen, that anterior segment may vibrate independently and cause a rough, gravelly voice quality. The capillary ectasia, left vocal cord is an incidental finding an not related to the patient’s rough voice quality.
Flaccidity without bowing (1 of 4)
The patient exhibits typical symptoms of bowing/atrophy/flaccidity, but in this case there is little bowing or atrophy—primarily flaccidity is seen. In this view, the abducted vocal cords appear full, with no exaggeration of the ventricles. (The apparent asymmetry between the vocal cords is due to the viewing angle; both cords are the the same.)
Flaccidity without bowing (2 of 4)
Now seen under the strobe light, the amplitude of vibration of the vocal cords is excessive. These flaccid vocal cords lack the firmness to "recoil" back to the mid-line, until maximal separation of the cords is reached.
Flaccidity without bowing (3 of 4)
As the patient is reaching the closed phase of the vibratory cycle, the anterior cords are arriving late to closure, a typical finding with flaccid vocal cords.
False cord phonation due to flaccid true cords (1 of 5): before false cords begin to vibrate
An elderly man, quiet by nature who uses the voice little, complains of weak, gravelly voice quality. This view of phonation, standard light, shows a slightly wider dark line of phonatory blurring. Also, the false vocal cords are overly approximated, but not yet participating in vibration (for that, see images 4 and 5).
False cord phonation due to flaccid true cords (2 of 5): before false cords begin to vibrate
Strobe light reveals an unusually wide amplitude of vibration, denoting flaccidity of the true vocal cords.
False cord phonation due to flaccid true cords (3 of 5): before false cords begin to vibrate
Maximum closed phase shows the telltale residual opening at the anterior commissure (from this perspective, the lowermost end of the true cords), also a potent indicator of flaccidity.
False cord phonation due to flaccid true cords (4 of 5): after false cords begin to vibrate
When asked to produce louder voice, the false cords begin to participate in vibration, and a rough, gravelly superimposed “godfather” quality arrives. Notice that the true cords are in at least partial open phase of vibration.
False cord phonation due to flaccid true cords (5 of 5): after false cords begin to vibrate
Now the false cords are in open phase of vibration, and the true cords are in maximum closed phase of vibration, with the same residual opening anteriorly seen in photo 3. False cord phonation is not to be seen most accurately as primary here, but as a secondary result of effort necessitated by flaccid true cords.
Flaccidity (1 of 5)
Under strobe light, the vocal cords begin opening at the area of flaccidity anteriorly. The patient has a husky and gravelly voice quality (view here rotated 90 degrees counterclockwise).
Flaccidity (3 of 5)
Open phase of vibration now complete. Distance of lateral excursions is large, indicating the flaccidity of cords.
Flaccidity (4 of 5)
The cords are returning to closed vibratory position, but anterior cords close late due to flaccidity. Sometimes this anterior segment vibrates independently and this causes a rough voice quality.