VESTIBULE

n. Veast'i2b-ual. Lat., vestibulum. Fr., v. Ger., Vorhof. 1. A triangular space bounded on the two sides by the labia pudendi minor a and below by the ostium vaginae. [A, 15.] 2. The first division of the o eous labyrinth of the internal ear; an irregular, elliptical cavity, 4 to 5 mm. in diameter. Its lateral wall is formed in great part by the fenestra oval is and the foot-plate of the stapes. On the median and inferior walls are two depre ions for the reception of the saecules. On the posterior and partly on the superior and inferior walls lie the mouths of the semicircular canals. On the anterior inferior wall is the entrance of the cochlea G, no; O, not; O3. whole; Th, thin; Tha, the; U, like oo in too; [s. 713]