👉 The pitch fluid, also known as the vocal fold mucosa or lamina propria, is a specialized tissue located within the larynx that plays a crucial role in vocalization. It consists of layers of elastic and collagen fibers, which work together to create a flexible yet resilient surface that vibrates when air from the lungs passes through it, producing sound. The pitch fluid's ability to adjust its viscosity and moisture content allows for fine-tuning of vocal pitch and quality, enabling the precise control needed for speech and singing. This fluid also helps maintain the structural integrity of the vocal folds, ensuring they remain healthy and functional for effective phonation.