. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. placed obliquely across the area of that is concave toward the meatus, and convex toward thetympanum. 949. The tympanum consists of an irregular bony cavity,situated within the temporal bone. It is bounded externallyby the membrana tympani ; internally by its inner wall ; andin its circumference by the petrous portion of the temporal 947. What is the meatus auditorius ? What is found in this canal ? Whatis their use ? Where is the wax of the ear secreted. 948. Describe themembrana tympani
. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. placed obliquely across the area of that is concave toward the meatus, and convex toward thetympanum. 949. The tympanum consists of an irregular bony cavity,situated within the temporal bone. It is bounded externallyby the membrana tympani ; internally by its inner wall ; andin its circumference by the petrous portion of the temporal 947. What is the meatus auditorius ? What is found in this canal ? Whatis their use ? Where is the wax of the ear secreted. 948. Describe themembrana tympani. 949. Where is the tympanum situated ? 416 ANATOMY, PHYSIOLOGY, AND HYGIENE. bone and mastoid cells. The tympanum contains four smallbones, called the os-sicu-la au-dita. These are named sepa-rately, the malle-us, incus, stapes, and or-bidu-lar. 950. There are ten openings in the middle ear; five largeand five small. The larger openings are, the Me-atus Aud-it-ori-us Ex-ternus, Fe-nestra O-valis, (oval window,) Fe-nestra Ro-tunda, (round window,) Mastoid Cells, andEu-stachi-an Tube. Fig. Fig. 145. A representation of the pinna, meatus, membrana tympani, bones of theear, and semicircular canals, a, The pinna, c, The meatus auditorius , The membrana tympani. /.-, The tympanum, e, The bones of the ear. ft, Thesemicircular canals. /, The cochlea, h, The vestibule, i, The Eustachian , The auditory nerve. 951. The fenestra ovalis is the opening of communica-tion between the tympanum and the vestibule. It is closedby the foot of the stapes, or bone of the ear, and by the liningmembrane of both cavities. 952. The fenestra rotunda serves to establish a com- What does this cavity contain ? 950. How many openings in the tym-panum ? Explain fig. 145. 951. Describe the fenestra ovalis. 952. Thefenestra rotunda. ANATOMY OF THE ORGANS OF HEARING. 417 munication between the tympanum and the cochlea. It isclosed by a proper membrane, as well as by the lining of bothcaviti
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