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tym·pan·ic mem·brane

[TA]
a thin tense membrane forming the greater part of the lateral wall of the tympanic cavity and separating it from the external acoustic meatus; it constitutes the boundary between the external and middle ears; it is a trilaminar membrane covered with skin on its external surface, mucosa in its internal surface, is covered on both surfaces with epithelium, and, in the tense part, has an intermediate layer of outer radial and inner circular collagen fibers.

drum

(drŭm)
n.
Anatomy The eardrum.

tym·pan·ic mem·brane

(tim-pan'ik mem'brān) [TA]
A thin, tense covering that forms the greater part of the lateral wall of the tympanic cavity and separates it from the external acoustic meatus; it constitutes the boundary between the external and middle ear, is covered on both surfaces with epithelium, and in the tense part has an intermediate layer of outer radial and inner circular collagen fibers.
Synonym(s): membrana tympani [TA] , drum membrane, drum, drumhead, eardrum, myringa, myrinx.
[L. membrana tympani]
References in periodicals archive ?
According to Mr Edwards, the metal drums had been stored for 15 to 20 years in a yard which he used but didn't own.
Britton is presently investigating some of the electrostatic hazards associated with the filling of 55-gallon metal drums. Even when such drums are grounded, the process of pouring in a flammable liquid such as toluene may ignite the liquid.
According to them, mosquitoes breed primarily in containers like earthenware jars, metal drums and concrete cisterns used for domestic water storage, as well as discarded plastic food containers, used automobile tyres and other items that collect rainwater.
METAL thieves made off with three large metal drums from a Tyneside business.
The metal drums were sealed and taken to the county's hazardous waste site in Glenwood.
In Metallica's case, this involves a number of speedy ditties which are rife with power cords and blast metal drums. Like Rock Band, this new Guitar Hero version has gone for the whole musical ensemble: guitar, drums and bass - and doesn't neglect the detail in any of them.
"At that time they decided they wanted to illuminate the clock, so it had to be lifted away from the building on metal drums.
Huddersfield Station Officer Dave Rawnsley said: "Forty-five-gallon metal drums were firing off and exploding in the sky.
The premier, who arrived in Kenya on Wednesday on the second leg of a three-nation tour of sub-Saharan Africa, flew to the camp about 700 kilometers northwest of Nairobi and was received by more than 1,000 welcoming refugees, who beat metal drums and held banners saying ''Thank you.''
Dents to the metal drums the chemical maker was using to ship adhesives and polymers overseas often caused the interior lining to loosen, flake, and ultimately rust, which contaminated the contents.
For its solid phosphites, GE is evaluating new 55-lb multilayer foil-lined bags intended to replace 50-lb metal drums. Jenkins says GE has also evaluated the option of "consumable" packaging for its products used in PVC compounding.