. Cunningham's Text-book of anatomy. Anatomy. Kecessus ellipticus Crista vestibuli Recessus spha?ricus Cochlea Fenestra cochlea; Fenestra vestibuli Ampulla of posterior semi circular canal | Ampulla of lateral semi- circular canal Lateral semicircular canal Posterior semi- circular canal Crus commune. Scala tympani Lamina spiralis ossea Scala vestibuli Opening of aquseductus cochlea; Fenestra cochleae Opening of crus commune Opening of aqusductus vestibuli Fig. 716.—Left Bony Labyrinth (viewed from the lateral aspect). Recessus cochlearis Fig. 717.—Interior of Left Bony Labyrinth (viewed from
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. Cunningham's Text-book of anatomy. Anatomy. Kecessus ellipticus Crista vestibuli Recessus spha?ricus Cochlea Fenestra cochlea; Fenestra vestibuli Ampulla of posterior semi circular canal | Ampulla of lateral semi- circular canal Lateral semicircular canal Posterior semi- circular canal Crus commune. Scala tympani Lamina spiralis ossea Scala vestibuli Opening of aquseductus cochlea; Fenestra cochleae Opening of crus commune Opening of aqusductus vestibuli Fig. 716.—Left Bony Labyrinth (viewed from the lateral aspect). Recessus cochlearis Fig. 717.—Interior of Left Bony Labyrinth (viewed from lateral aspect). from before backwards the cochlea, vestibule, and semicircular canals (Figs. 716, 717); (2) a complex arrangement of membranous channels (Fig. 720), situated within, but not nearly filling, the bony labyrinth and forming the membranous labyrinth. These channels are named the ductus cochlearis, the utricle, the saccule, and the semicircular ducts; the utricle and saccule are lodged within the vestibule. LABYEINTHUS OSSEUS. Vestibulum.—The vestibule is the central portion of the osseous labyrinth, and communicates behind with the semicircular canals and in front with the cochlea. It is somewhat ovoid in shape, its long axis being directed forwards and lateral wards; it measures about 6 mm. antero-posteriorly, 4-5 mm. vertically, and about 3 mm. transversely. Its lateral wall is directed towards the tympanic cavity, and in it is the fenestra vestibuli, which is closed by the base of the stapes. Its medial wall corresponds with the bottom of the internal acoustic meatus, and presents, at its antero-inferior part, a rounded depression, the recessus sphaericus, which lodges the saccule. This recess is perforated by twelve or fifteen small foramina (macula cribrosa media), which transmit the filaments of the acoustic nerve to the saccule. The recessus sphsericus is limited above and behind by an oblique ridge, the crista vestibuli, the anterior extremity of whic
