The long limb of the incusis angular and longer than that of Zapus.
The incus has a rounded body with a long angular limb articulating via a small lenticular process with the stapes.
The short limb of the incus is broad basally and narrows somewhat distally.
The body of the incus is flattened dorsally but otherwise rounded.
The short limb of the incusis broad at the base and tapers distally.
In summary: Only the head and body of the malleus and the short and long limbs and body of the incus are sufficiently consistent within a given group to be of taxonomic importance.
The incus has a dorsally rounded body with an anterior downward snoutlike projection with which the malleus articulates.
The sides of the long limb of the incus are nearly parallel.
The body of the incus is round and the short process is elongate.
In the genus Peromyscus, only Peromyscus floridanus (subgenus Podomys) possesses a knoblike short process on the incussimilar to that in B.
The short process of the incus is knoblike in Calomys and Thaptomys, and the general conformation of malleus and stapes in those two genera is nearly identical to that in B.
The sides of the long limb of the incus are not parallel.
The middle segment becomes in mammals the incus (one of the ear-ossicles), and in birds the quadrate.
The stapes is only very slightly perforated in both specimens; while a small circular disc firmly fixed to the incus represents the orbicular bone in the second skull.
The auditory ossicles of Grypotherium, therefore, are very different from those of Myrmecophaga, in which the malleus is less sharply bent, the incus has divergent arms of unequal length, and the stapes exhibits a large perforation.
Stewart, it is remarkable in articulating with theincus not only by the head, but also by a diminutive lower facet, which is in contact with a small facetted process on the anterior arm of the incus.
The two divergent arms of the incus are equal in length, as usual in the Sloths.
The long process of the incus runs downward and ends in a little knob called the os orbiculare, which is jointed on to the stapes or stirrup bone (fig.
From the front of the malleus a slender process projects forward into the Glaserian fissure, while from the back of the incus the posterior process is directed backward and is attached to the posterior wall of the tympanum.
This is attached by its handle to the umbo of the tympanic membrane, while its head lies in the attic and articulates posteriorly with the upper part of the next bone or incus (fig.
The head of the malleus is drawn out into a great club-shaped process, the incus is long and narrow, and differs much from the ordinary type.
The incus has the stapedial end greatly developed, and the stapes has very thick crura with hardly any canal.
In the Carnivora vera the incus and stapes are small as compared with the malleus, but in the Pinnipedia they are large.
The incus consists of an anvil-shaped portion from which arises a long tapering process.
In many genera such as Bathyergus, and most of the Hystricomorpha such as Hystrix, Chinchilla and Dasyprocta, the malleus and incusare ankylosed together.
The incus is articulated, or often fused, with an outgrowth from the head of the malleus.
With a fine hook the long leg of the incus is dislocated forwards or backwards from the stapes.
In the course of a chronic middle-ear suppuration, the incus may become exfoliated or gradually disappear as the result of caries.
If it be possible to see the long process of the incus and its articulation with the head of the stapes, the articulation should be cut through with a small sickle-shaped knife.
The knife is inserted just in front of the long process of the incus and, keeping close to it posteriorly, is made to cut downwards and backwards, thus separating its connexion with the stapes.
As the rotatory action is continued downwards and finally forwards, the incus is dislodged from its position and forced into the tympanic cavity.
It is passed over the incus in the same manner as an incus hook.
Removal of the incus by the ordinary instruments may be rendered impossible owing to the narrowness of the attic posteriorly from chronic thickening of its walls.
As the result of middle-ear suppuration the malleus and incus may become exfoliated.
The shaft of the instrument is then rotated backwards so that the hook passes over the body of the incus (Fig.
The malleus and incusare at first embedded in the connective tissue adjoining the tympanic cavity (hyomandibular cleft, vide p.
The dorsal end of the part of the hyoid separated from the incus becomes ossified as the tympano-hyal, and is anchylosed with the adjacent parts of the periotic capsule.
The incus is articulated with the quadrate end of the mandibular arch, and its rounded head comes in contact with the stapes (fig.
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.
It loses its connection with the palato-pterygoid, and apparently ossifies as a small ossicle-- the incus of the middle ear.
This causes the incus to move through a shorter distance, but with greater force than the end of the malleus.
The bridge of bones, being pivoted at one point to the walls of the middle ear, forms a lever in which the malleus is the long arm, and the incus and stapes the short arm, their ratio being about that of three to two.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "incus" in a variety of sentences. We hope that you will now be able to make sentences using this word.
