lips of mouth

lips of mouth

[TA]
fleshy folds with skin externally and oral mucosa internally that surround the oval fissure and form the anterior walls of the oral vestibule; with the enclosed orbicularis oris and various dilator muscles, the lips constitute the cranial sphincter of the alimentary tract.
Synonym(s): labia oris [TA]

lips of mouth

(lips mowth) [TA]
Fleshy folds with skin externally and oral mucosa internally that surround oval fissure and form anterior walls of oral vestibule; with the enclosed orbicularis oris and various dilator muscles, constitute cranial sphincter of the alimentary tract.