Vocal fold closure is when the bilateral vocal folds fit together.
The vocal cords are located below the ventricular cords, one on each side, and consist of the vocal ligaments, vocal muscles, and mucosa. In indirect laryngoscopy the vocal cords appear as white bands with neat edges. The posterior end of the vocal folds are attached to the vocal cords of the arytenoid cartilage, so they can open or close with the movement of the vocal cords.
Normal vocal fold closure is the process and state in which the central nervous system causes the vocal folds to retract through the laryngeal nerve during vocalization. Pathological vocal fold closure is often caused by incomplete bilateral laryngeal nerve palsy, because both vocal folds cannot be abducted, and indirect laryngoscopy shows that both vocal folds are close to the midline, with only a small slit between them. The vocal folds remain closed during vocalization.
If you want to know more about the morphology and mechanism of your vocal fold closure, you can actively seek medical advice and consult your doctor about the results of the electronic fiberoptic laryngoscopy and introduce relevant information and knowledge.