From Merriam Webster's Medical Dictionary:
Main Entry:
uvu·la
Pronunciation: 'yü-vy&-l&
Function:
noun
Inflected Form:
plural uvu·las /-l&z/
or uvu·lae /-"lE/
1 : the pendent fleshy lobe in the middle of the posterior border of the soft palate
2 : a lobe of the inferior vermis of the cerebellum located in front of the pyramid —
uvu·lar /-l&r/
adjective
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
From the same source:
Main Entry:
epi·glot·tis
Pronunciation: "ep-&-'glät-&s
Function:
noun
: a thin lamella of yellow elastic cartilage that ordinarily projects upward behind the tongue and just in front of the glottis and that with the arytenoid cartilages serves to cover the glottis during the act of swallowing
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
And for those unfamiliar with anatomy:
Main Entry:
glot·tis
Pronunciation: 'glät-&s
Function:
noun
Inflected Form:
plural glot·tis·es or glot·ti·des /-&-"dEz/
: the space between one of the true vocal cords and the arytenoid cartilage on one side of the larynx and those of the other side;
also : the structures that surround this space —compare
[SIZE=-1]EPIGLOTTIS[/SIZE]
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
The vocal cords are at the top of the air passage.
The epiglottus covers the tracheal opening while swallowing. The uvula has no known function (except to act as a punching bag in cartoons).