. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. ed 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 j^uditorius ? What is found in this canal ? What!5 their use ? Where is the wax of the ear secreted. 948 Describe themembrana tympani. 949.
. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. ed 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 j^uditorius ? What is found in this canal ? What!5 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-si^u-la mt-dita. These arc named sepa-rately, the malh-us^ inciis^ siapes, and or-hicii-Jar. 950. There are ten openings in the middle eir; fTve largeand five small. T\\q larger openings are, the Me-atus Aud-it-ori-us Ex-ternus^ Fe-nestra 0-imlis, (oval^ window,) Fe7iestra Ro-timda, (round window,) Masioid Cells^ ixivXEu-slacJii-an Tube. n-. Fig. 145. A representation of the pinnn, meatus, membrana tympani, bones of theear, and gpiiiicircular canals, a, Tlie pinna, c, The meatus auditorius The membrana tjmiiani. k. The tiinpaniim. e, The bones of tlie ear. b, Thesemicircular canals. /, The cochlea. A, The vestibule, i, The Eustachian tubed, The auditory nerve. 951. The FENESTRA ovALis is the opening of communica-tion between the tympamun and the vestibule. It is closedby the foot of the stapes, or bone of the ear, and by the liningmembrane of bolh cavities. 052. 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. Tiiofauestra rotunda. ANATOMY OF TlIK ORGANS OF HEARING. 417 rnunication between tlie tympanum and the cochlea. It laclosed by a proper membrane, as well as by the lining of both
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