tympanal


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tympanic

 [tim-pan´ik]
1. bell-like; resonant. Called also tympanal and tympanitic.
2. of or pertaining to the tympanum.
tympanic membrane a thin, semitransparent membrane, nearly oval in shape, that stretches across the ear canal and separates the tympanum (middle ear) from the external acoustic meatus (outer ear); called also eardrum. It is composed of fibrous tissue, covered with skin on the outside and mucous membrane on the inside. It is constructed so that it can vibrate freely with audible sound waves that travel inward from outside. The handle of the malleus of the middle ear is attached to the center of the membrane and receives the vibrations it collects, transmitting them to the other ossicles of the middle ear (the incus and stapes), which in turn transmit the vibrations to the fluid of the inner ear.



Perforation of the tympanic membrane can cause loss of hearing, the extent depending on the size and location of the perforation. Since vibrations can still be transmitted to the inner ear by way of the bones of the skull, even nearly total destruction of the tympanic membrane does not produce total deafness. Surgical incision of the membrane (myringotomy) or insertion of ventilating tubes may be done to relieve pressure and provide for drainage in an infection of the middle ear. See also otitis media.
Tympanic membrane. From Jarvis, 1996.

tym·pa·nal

(tim'pă-năl),
1. Synonym(s): tympanic (1)
2. Resonant.
3. Synonym(s): tympanitic (2)

tympanal

/tym·pa·nal/ (tim´pah-n'l) tympanic.

tympanal

See tympanic.

tym·pa·nal

(tim'pă-năl)
1. Synonym(s): tympanic (1) .
2. Resonant.
3. Synonym(s): tympanitic (2) .

tympanal

pertaining to the tympanum or to the tympanic membrane.
References in periodicals archive ?
Tegmina fully developed ; wings longer or shorter than the tegmen; fore coxae without spine; sometimes with small spine; femora spinoses on lower side, fore and mid tibiae with longitudinal upper groove and spinules on margin fore tibiae moderately and gradually widened at bases tympanal opening oval ,exposed and covered by membrane; subgenital plate of male bifurcate with long lobes or tubular, lack apical styles.
Fore and, mid tibiae un-cylindrical; with longitudinal upper groove or flate; mid tibiae with spinules on posterior margin; openings of tympanal organ on fore tibiae oval, exposed and membranous.
wings longer than tegmen; fore coxae with long soine, femur with spinosa on lower side ;fore tibiae, mid\tibiae with longitudinal groove on upper side, tibiae widened basally; posterior opening of tympanal organ, oval, membranous exposed; anterior opening concealed by swelling; in from of wide slit externally; terminal abdominal tergite with tubercles; subgenital plate of male with styles; ovipositor not shorter then pronotum, varying in shape, fully developed.
Antennae, pliable, thin; pronotum conspicuous humeral notch on lateral lobes; tegmen not wide, but fully developed; wings longer than tegmen; fore coxae lack spines or with a small spinule; fore femora compressed laterally with longitudinal upper carina; lower side groove, serrate or with a large spine; fore tibiae with longitudinal upper groove; with spines on the posterior margin ; tympanal openings concealed by swellings in from of wide slit externally; subgenital plate of male with deeply bifurcate.
The ears of the fly are endowed with two thin tympanal membranes, the eardrums, that are set very close together across the midline of the animal.
Taking place at the peripheral level of the tympanal membranes, the first step in the process of hearing pertains to the conversion of acoustic energy into mechanical energy.
In an effort to unite structure and function in a functional explanation, the reconstitution of actual tympanal deflections provides key information on the anatomical basis for the observed mechanical behavior.
The functional principle for this effect resides in the somewhat complex linear interaction between two coupled oscillators--the tympanal membranes.
As such, the process of mechanical coupling between tympanal membranes, and its amplification effect on interaural auditory cues, seems to be unique to flies.
sphex of a spine on the ventral anterior margin of the tympanal ridge--is also found in most specimens of A.
Yack's team is now trying to determine if the beetles have sound receptors called tympanals, which can pick up ultrasonic vibration.