Where are the valleculae and pyriform sinus?

The valleculae are small recesses located at the base of the tongue, specifically between the epiglottis and the tongue. They play a role in the swallowing process by collecting saliva and food particles. The pyriform sinuses, on the other hand, are located on either side of the larynx, just above the esophagus, and serve as channels for food and liquid to pass during swallowing. Both structures are important in the anatomy of the throat and contribute to the swallowing mechanism.