All are agreed that there is a complicated apparatus in the cochlea which may serve this purpose; but while some are of opinion that this structure is sufficient, others hold that the analysis takes place in the brain.
It is to be noted also that the parts in the cochlea are so small as to constitute only a fraction of the wave-length of most tones audible to the human ear.
In 1865 Rennie objected to the analysis theory, and urged that the cochlea acted as a whole (Ztschr.
Measurements of thecochlea have also shown such differentiation as to make it difficult to imagine that it can act as a whole.
Mayer also applies the theory to the explanation of the powers of the cochlea as an analyser, by supposing that with a compound tone these are at maxima and minima of stimulation.
It is also known that there are no rods of Corti in the cochlea of birds, which are capable nevertheless of appreciating pitch.
He explained accurately the mechanism of the bones of the ear, and he discussed the physiological action of the cochlea on the principles of sympathetic vibration.
Helmholtz assumed that a sound is noisy when the wave is irregular in rhythm, and he suggested that the crista and macula acustica, structures that exist not in the cochlea but in the vestibule, have to do with the perception of noise.
It is by means of the cochlea that we discriminate pitch, hear beats, and are affected by quality of tone.
The three semicircular canals appear to correspond to the intestine, the cochlea to the trachea.
It is thus developed as in Man, while to the ears the external auditory meatus and cochlea are wanting, the eyes being barely endowed with lids and motion.
The external auditory meatus is notwithstanding usually covered by integument, the auditory ossicles are mostly blended into one, which projects above the skull; the cochlea is wanting.
Helmholtz's Sensations of Tone had just been published and the function of the cochlea now appeared clear to the whole world.
From here the vibrations pass through the channels of the cochlea and set into vibration the contents of the scala media and different portions of the basilar membrane.
This membrane extends the length of the cochlear canals, and is stretched between a projecting shelf of bone on one side and the outer wall of the cochlea on the other.
The opening by which the two scal\'91 communicate at the top of the cochlea of the ear.
The terminal part of the cochlea in birds and most reptiles; an appendage of the sacculus, corresponding to the cochlea, in fishes and amphibians.
The central column in the osseouscochlea of the ear.
The thin membrane which separates the canal of the cochlea from the vestibular scala in the internal ear.
One passage from the cochlea opens directly into the vestibule; the other leads to the chamber of the middle ear, and is separated from it by the little round window already described.
The cochlea contains thousands of the most minute cords, known as the fibers or organ of Corti.
The cochleareceives the sound-waves (variations of pressure) that constitute musical tones.
The labyrinth consists of the vestibule, the cochlea and the semicircular canals.
Defn: The central column in the osseous cochlea of the ear.
Defn: The thin membrane which separates the canal of the cochlea from the vestibular scala in the internal ear.
Defn: pertaining to the sacculus and cochlea of the ear.
Defn: The opening by which the two scalæ communicate at the top of the cochlea of the ear.
Defn: The terminal part of the cochlea in birds and most reptiles; an appendage of the sacculus, corresponding to the cochlea, in fishes and amphibians.
Anteriorly the vestibule leads into the cochlea (fig.
SV), the middle and outer the scala media, ductus cochlearis or true membranouscochlea (fig.
Transverse Section of Corti's Organ from the Central Coil of Cochlea (Retzius).
The scala vestibuli and scala tympani communicate at the apex of the cochlea by an opening known as the helicotrema, so that the perilymph can here pass from one canal to the other.
In the birds the cochlea resembles that of the crocodiles, but the posterior semicircular canal is above the superior where they join one another.
A section through each turn of the cochlea shows the bony lamina spiralis, already noticed, which is continued right across the canal by the basilar membrane (fig.
Anteriorly the saccule communicates with the membranous cochlea or scala media by a short ductus reuniens (fig.
In the Chelonia and Ophidia the cochlea is as rudimentary as in the Amphibia, but in the higher forms (Crocodilia) there is a lengthened and slightly twisted cochlea, at the end of which the lagena forms a minute terminal appendage.
The inner wall shows a promontory caused by the cochlea and grooved by the tympanic plexus of nerves; above and behind it is the fenestra ovalis, while below and behind the fenestra rotunda is seen, closed by a membrane.
The cochlea may also be injured from violent curetting of the promontory, or infected from dislodgment of the stapes; or it may even happen that a careless operator may inadvertently chisel through the promontory itself.
Before the operation is completed, the inner wall of the vestibule and the cochlea should be carefully examined for fistulæ, and in order to see if any pus enters these cavities from within.
The outer half of the first whorl of the cochlea is formed by the promontory.
If there be suppuration within the cochlea, sufficient drainage will not be obtained by merely opening the vestibule through the semicircular canals, but the cochlea itself must be opened.
The vestibule is freely opened and the greater portion of the semicircular canals and cochlea is removed.
If necessary, the first turn of the cochlea can now be removed by gouging away the promontory from behind forwards.
To destroy the cochlear nerve, the whole of the cochlea should be removed.
How is the interior of the canal of the cochlea divided?
The interior of the canal of the cochlea is partially divided into two passages, by means of a bony and membranous plate.
The cochlea and semicircular canals open into the vestibule.
A cone in the cochleaaround which the membranes wind.
Once started in this liquid, the vibrations are propagated through it to the sense cells of the cochlea and stimulate them in the way already suggested.
From the one we get the utriculus with the semi-circular canals; from the other the sacculus and the cochlea (Figure 2.
The cochlea is wanting even in the Monotremes, and is restricted to the rest of the mammals and man.
Sometimes the cochlea is much reduced in size; at other times it is found to be of normal size (2 p.
The utriculus opens broadly into the scala tympani, and the nervous elements of the cochlea are degenerate.
In the cochlea are about 2,800 tiny nerve-ends, called the rods of Corti.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "cochlea" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: anvil; ear; eardrum; hammer; lobe; shell; stapes; stirrup; tympanum; vestibule
