Vocal cords

Vocal cords are membranes found in the throat of humanoids that vibrate, enabling speech.

The empathic Minaran species lacked vocal cords, a condition that was physiologically normal for their race. 

In 2268, Captain Kirk instructed Doctor McCoy to prioritize connecting Spock's vocal cords to his brain so that Spock would be able to assist the doctor with his surgery. 

Later that year, Kirk suggested that Commissioner Bele rest his vocal cords after a lengthy argument regarding the extradition of Lokai, whom Bele had been pursuing for over 50,000 years. 

Orta, a Bajoran terrorist, had his vocal cords forcibly removed by the Cardassian Union and, as a result, was forced to use an embedded voice synthesizer in his neck for the rest of his life. 

Talaxian vocal cords were incapable of producing basic diatonic tones, which meant they had difficulty singing. 

In 2377, Q fused Neelix's jaw and removed his vocal cords because he thought he talked too much. Q eventually repaired the damage done by his son.