The sudden cessation of pain and the appearance of a discharge from the meatus indicate perforation of the membrana tympani.
These symptoms may be relieved by the removal of this strand of tissue from the gap in the vertebral arches, or by incising the membrana reuniens.
The portion of the membrane situated above the short process is known as the membrana flaccida or Shrapnell's membrane.
As this strand of tissue does not grow in proportion with the body, in the course of years it drags the cord against the lower border of the membrana reuniens, which closes in the vertebral canal posteriorly.
The mobility of the membranatympani should be tested by inflating the tympanum or by means of Siegle's pneumatic speculum.
The small openings of the middle ear are for the entrance and exit of the chorda tympani, (a small nerve that crosses the tympanum,) and for the exit of the muscles that act upon the membrana tympani and bones of the ear.
Imperfect hearing may be produced by the destruction of the membrana tympani, or removal of the bones of the ear, or the parts within the labyrinth.
Hearing may be rendered defective by a diminution of the vibratory character of the membrana tympani.
The supposed office of the tympanum is to transmit the vibrations made on the membrana tympani to the internal ear.
This is the result of the air in the middle ear escaping through the Eustachian tube, when the vibrations of the membrana tympani are violent.
The vibrations of air are collected by the external ear, and conducted through the tube (1) to the membrana tympani, (2.
A representation of the pinna, meatus, membrana tympani, bones of the ear, and semicircular canals.
It is bounded externally by the membrana tympani; internally by its inner wall; and in its circumference by the petrous portion of the temporal bone and mastoid cells.
The pain is owing to the extreme sensibility of the membrana tympani.
The membrana tympani serves to facilitate the transmission of sounds, and also to moderate their intensity.
The introduction of heads of pins into the ear is a frequent cause of chronic inflammation of the membrana tympani.
The middle ear is a small cavity, the walls of which are rigid with the exception of the portions consisting of the membrana tympani, and the membrane of the round window and of the apparatus filling the oval window.
Vibrations are transmitted along the auditory canal, partly by the air it contains and partly by its walls, to the membrana tympani.
This cavity communicates with the pharynx by the Eustachian tube, which forms an air-tube between the pharynx and the tympanum for the purpose of regulating pressure on the membrana tympani.
The vibrations of the membrana tympani are transmitted to the internal ear partly by the air which the middle ear or tympanum contains, and partly by the chain of bones, consisting of the malleus, incus and stapes.
This feeling of exteriority of sound seems to require transmission through the membrana tympani.
As the membranatympani is not only fixed by its margin to a ring or tube of bone, but is also adherent to the handle of the malleus, which follows its movements, its vibrations meet with considerable resistance.
If the tumour is seated close to the membrana tympani, and has a broad and sessile base, then it cannot be excised or noosed with any degree of success.
The apparent squinting of the eye in distemper is caused by the probably unequal protrusion of the membrana nictitans over a portion of the eye at the inner canthus, in order to protect it from the light.
A very delicate membrane (membrana pupillaris,) by which the pupil has been hitherto closed, now ruptures, and the pupil becomes visible.
The layer of coagulable lymph, which is effused upon its internal surface, and which forms the membrana decidua of Hunter, is present, and the uterus undergoes a slight increase of volume.
Each wave of sound falling upon the membrana tympani, throws its molecules into vibrations which are communicated to the chain of bones, which, in turn, transmits them to the membrane of the foramen ovale.
This secretion serves the double purpose of moistening the outer surface of the membrana tympani, or ear-drum, and, by its strong odor, of preventing the intrusion of insects.
There is a membrana nictitans; and the eyelid is very loose upon the eyeball: it is probably capable of great dilatation and contraction.
The membrana tympani is larger than in other quadrupeds of the same size.
We now come to what may be called the provision bag, because it encloses the yolk, which serves as food for the animal in embryo; it is called membrana vitelli, or the skin of life.
It is ciliated except where it covers themembrana tympani, ossicles and promontory; here it is stratified.
The external auditory meatus, tympanum and Eustachian tube are remains of the hyomandibular cleft, the membrana tympani being a remnant of the cleft membrane and therefore lined by ectoderm outside and entoderm inside.
In this class the tympanum and Eustachian tube are first developed; the membrana tympani lies flush with the skin of the side of the head, and the sound-waves are transmitted from it to the internal ear by a single bony rod--the columella.
When an opening has been made in the membrana tympani either by incision or ulceration, it is advisable in some instances to inflate the tympanum by Politzer's method, which has been alluded to above.
Hence severe earache, an increase of the febrile movement, and outward bulging of the membrana tympani occur.
In the most prominent portion of the membrane I made an incision scarcely three millimetres (one-tenth inch) in length, and involving simply the different layers of the membrana tympani.
An examination with the speculum and reflected light showed an oedematous and bulging membrana tympani (posterior half), the neighboring parts being very red, though as yet but little swollen.
The anterior part of the vascular sheath is however inclosed in a very delicate membrane, the membrana pupillaris, continuous at the sides with the epithelium of Descemet's membrane.
Between the membrana elastica externa and the sheath of the notochord a layer of cells becomes interposed (fig.
It is bounded internally by a membrane--the true membrana elastica externa.
According to Koelliker this ingrowth subsequently becomes split into two laminae, one of which forms the cornea, and the other the anterior part of the vascular sheath of the lens with itsmembrana pupillaris.
On its external (posterior) surface a distinct cuticular membrane, themembrana limitans externa, early appears.
Above the ridge there appears a delicate cuticular membrane, the membrane of Corti ormembrana tectoria.
The membrana reticularis is a cuticular structure derived from the parts to which it is attached.
Around the sheath of the notochord there is formed in the Cyclostomata, Ganoidei, Elasmobranchii and Teleostei an elastic membrane usually known as the membrana elastica externa.
In Mammals there appear to be some mesoblast cells invaginated with the lens, which are not improbably employed in the formation of the vessels of the so-called membrana capsulo-pupillaris.
The latter in Mammalia is the membrana capsulo-pupillaris and other vessels of the vitreous humour; in Birds and Lizards it is the part of the original vascular loop, not included in the pecten, and in Osseous Fishes that part (?
The vascular sheath surrounding the lens receives the name of the membrana capsulo-pupillaris.
The sheath becomes very much thickened; and on the membrana elastica covering it the vertebral arches directly rest.
Partly springing out from the labium vestibulare, and passing from near the inner attachment of the membrane of Reissner towards the outer wall of the cochlea, is an elastic membrane, the membrana tectoria.
In the first place, it makes it possible for sound waves to set the membrana tympani in vibration.
The area of the membrana tympani is about twenty times as great as the membrane of the internal ear which is acted upon by the stapes.
The auditory canal is a little more than an inch in length and one fourth of an inch in diameter, and is closed at its inner end by a thin, but important membrane, called *The Membrana Tympani.
The middle ear is also called the ear drum, and, by the same system of naming, the membrana tympani is referred to as the drum membrane.
These bones, named in their order from the membrana tympani, are the malleus, the incus, and the stapes (Fig.
In the second place, the middle ear provides a means for concentrating the force of the sound waves as they pass from the membrana tympani to the internal ear.
Extending across the middle ear and connecting with the membranatympani on one side, and with a membrane closing a small passage to the internal ear on the other, is a tiny bridge formed of three small bones.
The bridge of bones and the air in the middle ear receive vibrations from the membrana tympani and communicate them to the membrane of the internal ear.
Being thin and delicately poised, the membrana tympani is easily made to vibrate by the sound waves that enter the auditory canal.
Passing through the auditory canal, the waves strike against the membrana tympani, setting it into vibration.
He describes it as composed of the following layers:-- (1) Membrana limitans interna.
The haw, or membrana nictitans, is subject to inflammation and swelling from the extension of conjunctivitis, or direct injury by foreign substances.
The membrana nictitans, which is also named the third eyelid, winking eyelid, haw, etc.
Independently of the globe of the eye, this cavity lodges the muscles that move it, the membrana nictitans, and the lacrimal gland.
Footnote 2: On the Difference between the Human Membrana Tympani and that of the Elephant.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "membrana" in a variety of sentences. We hope that you will now be able to make sentences using this word.
