A prepositional phrase is comprised of two parts, a preposition and an object of the preposition. Together, they form the prepositional phrase that is then inserted in a sentence to modify some noun or verb.
The epiglottis is a flap made of elastic cartilage tissue covered with a mucous membrane, attached to the entrance of the larynx. It projects obliquely upwards behind the tongue and the hyoid bone, pointing dorsally. It stands open during breathing, allowing air into the larynx.
The epiglottis is a cartilaginous flap that covers the laryngeal inlet upon swallowing. Dysfunction of the epiglottis results in dangerous dysphagia and could cause aspiration pneumonia. In this article we will discuss the development, blood supply, nerve supply, lymphatic drainage and functions of the epiglottis.