Anatomy and physiology : designed for academies and families . canals. The Fenestra ovalis is the opening into the tympanum. Describe the fenestra ovalis. The fenestra rotunda. The mastoid Eustachian tube. Why is the internal ear called the labyrinth ? De-scribe the bony labyrinth. Where is it situated ? How is it divided ?Describe the vestibule. 286 ANATOMY AND PHYSIOLOGY. The Scala vestibule is the oval termination of the vestibu-lar canal of the cochlea. The semicircular canals are three bony passages whichcommunicate with the vestibule, into which two open at bothextremities, and
Anatomy and physiology : designed for academies and families . canals. The Fenestra ovalis is the opening into the tympanum. Describe the fenestra ovalis. The fenestra rotunda. The mastoid Eustachian tube. Why is the internal ear called the labyrinth ? De-scribe the bony labyrinth. Where is it situated ? How is it divided ?Describe the vestibule. 286 ANATOMY AND PHYSIOLOGY. The Scala vestibule is the oval termination of the vestibu-lar canal of the cochlea. The semicircular canals are three bony passages whichcommunicate with the vestibule, into which two open at bothextremities, and the third at one extremity. The cochlea, so called from its resemblance to a snailshell, forms the anterior portion of the labyrinth. It consistsof a bony and gradually tapering canal, about one and a halfinches in length, which makes two turns and a half, spirally,around a central axis, called the modiolus. The modiolus islarge near its base, where it corresponds with the first turn ofthe cochlea, and diminishes in diameter towards its extremity. Fig. Fig. 197. A view of the labyrinth of the left ear, laid open in its whole extent, soan to show its structure. This figure is highly magnified. 1,1, The thickness of the outer covering of the cochlea. 2,2,2, The scala vestibuli,or upper layer of the lamina spiralis. 3,3, 3, 3, 3, The scala tympani, or lower layerof the lamina spiralis. 4, The hamulus cochleae. 5, The centre of the , The foramen rotundum, communicating with the tympanum. 7, The thickness ofthe outer layer of the vestibule. 8, The foramen rotundum. 9. The fenestra , The orifice of the aqueduct of the vestibule. 11, The inferior semicircular , The superior semicircular canal. 13, The external semicircular canal. 14, Theampulla of the inferior canal. 15, The ampulla of the superior canal. 16, The com-mon orifice of the superior and inferior canals. 17, The ampulla of the externalcanal. What are the semicircular canals ? Why was th
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
