Oral cavity
Cavitas oris
Definition
The cavity of the mouth is placed at the commencement of the digestive tube; it is a nearly oval-shaped cavity which consists of two parts: an outer, smaller portion, thevestibule, and an inner, larger part, the mouth cavity proper.
References
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).