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Transverse section of external auditory canal and tympanum. Left side.

Auditory Canal and Tympanum

Transverse section of external auditory canal and tympanum. Left side.

The auditory ossicles of the right ear, seen from the front. Labels: M, malleus; J, incus; S, stapes; Mcp, head of the malleus; Mc, neck of the malleus; Ml, long process; Mm, handle; Jc, boy; Jb, short, and Jl, long process of incus; Jpl, os orbiculare; Scp, head of stapes.

The Auditory Ossicles

The auditory ossicles of the right ear, seen from the front. Labels: M, malleus; J, incus; S, stapes;…

"Diagram showing the ear and related parts in a young cat. P., Pinna; Sq., squamosal: E.A.M., external auditory meatus; T., tympanum; M., malleus; I., incus; St., stapes abutting onforamen ovale; B., bulla of tympanic bone; Se., a septum in the bulla; E.T., eustachian tube leading from the tymmpanic cavity to the back of the mouth; B.O., basi-occipital; C., cochlea; S., sacculus; U., utriculus; D.E., ductus endolymphaticus; N., auditory nerve; S.C., semi-circular canal; PE., periotic bone." -Thomson, 1916

Cat Ear

"Diagram showing the ear and related parts in a young cat. P., Pinna; Sq., squamosal: E.A.M., external…

"Diagram of the Middle and Internal Ear." — Blaisedell, 1904

Ear

"Diagram of the Middle and Internal Ear." — Blaisedell, 1904

Bones of the ear: Malleus, Incus and Orbiculare, Stapes. The bones of the area are connected with each other in the drum and serve to transmit vibrations of the membrane of the tympanum to the internal ear. They are very hard and brittle, with no cartilage on their articular surfaces like other bones.

Bones of the Ear

Bones of the ear: Malleus, Incus and Orbiculare, Stapes. The bones of the area are connected with each…

A, the malleus, or mallet, with its long handle running down, to touch with its delicate extremity the membrane of the drum. B, is the incus, or anvil, nicely fitted to the mallet, and showing C, the orbicular bone placed between its termination, and D, the stirrup. The line a,b, represents the center of motion of the malleus, and c,d, the center of motion of the incus. Now this chain of bones acts on the principle of a long level, as a small motion at one end of a long pole serve to move it through a wide space at the other.

Bones of the Ear

A, the malleus, or mallet, with its long handle running down, to touch with its delicate extremity the…

"Across the middle ear a chain of three small bones stretches from the tympanic membrane to the inner ear. These bones are called from their shape the <em>malleus</em> (hammer), the <em>incus</em> (anvil), and the <em>stapes</em> (stirrup)." — Ritchie, 1918

Bones of the Ear

"Across the middle ear a chain of three small bones stretches from the tympanic membrane to the inner…

"1, malleus, or hammer; 2, incus, or anvil; 3, stapes, or stirrup." — Blaisedell, 1904

Bones of the Ear

"1, malleus, or hammer; 2, incus, or anvil; 3, stapes, or stirrup." — Blaisedell, 1904

General sectional view of the structure of the ear. Labels: a, the meatus auditorius externus; b, the tympanum; c, the malleus; d, the incus, e, the os orbiculare; f, the stapes; g, the semicircular canals; h, the cochlea; i, the meatus auditorius internus; k, the eustachian tube.

Sectional View of the Ear

General sectional view of the structure of the ear. Labels: a, the meatus auditorius externus; b, the…

"Mature stapes of fowl, about x4; after Parker. st, its foot, fitting fenestra ovalis; mst, main shaft, or medio-stapedial element; sst, supra-stapedial; est, extra-stapedial; ist, infra-stapedial, its end representing a rudimentary stylo-hyal; f, a fenestra in the extra-stapedial." Elliot Coues, 1884

The Ear Bone of Fowl

"Mature stapes of fowl, about x4; after Parker. st, its foot, fitting fenestra ovalis; mst, main shaft,…

Chain of ossicles and their ligaments, seen from the front in a vertical transverse section of the tympanum.

Ossicles of the Tympanum

Chain of ossicles and their ligaments, seen from the front in a vertical transverse section of the tympanum.

The right stapes viewed from above.

Stapes Viewed from Above

The right stapes viewed from above.

Medial view of the right stapes.

Stapes, Medial View of the

Medial view of the right stapes.

The stapes on stirrup-bone. 1, base; 2 and 3, arch; 4, head of bone, which articulates with orbicular process of the incus; 5, constricted part of the neck; 6, one of the crura.

Stapes on Stirrup-Bone

The stapes on stirrup-bone. 1, base; 2 and 3, arch; 4, head of bone, which articulates with orbicular…

The tympanic ossicles, which are 3 small bones that form a chain across the tympanic cavity, connecting the membrane with the fenestra vestibuli. The 3 bones are known s the Malleus, the Incus, and the Stapes.

The Tympanic Ossicles

The tympanic ossicles, which are 3 small bones that form a chain across the tympanic cavity, connecting…

Tympanic ossicles of left ear. A, incus as seen from front. B, Malleus, viewed from behind. C, Incus seen from inner aspect. D, Malleus seen from inner aspect. E, Stapes. Labels: 1, body of incus, with articular surface for head of malleus; 2, processus longus; 3, processus lenticularis; 4, articular surface of incus; 5, head; 6, neck; 7, processus brevis; 8, manubrium; 9, body; 10, short process; 11, long process; 12, processus longus; 13, head; 14, facet for incus; 15, manubrium; 16, head; 17, neck; 18, crus anterior; 19, crus posterior; 20, footplate.

Tympanic Ossicles

Tympanic ossicles of left ear. A, incus as seen from front. B, Malleus, viewed from behind. C, Incus…

Left membrana tympani and chain of tympanic ossicles.

Tympanic Ossicles

Left membrana tympani and chain of tympanic ossicles.