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Human anatomy, including structure and development and practical considerations . er with the fibres of the anterior iij^anieiit iyin.^ in the same plane, form the axis-ligament of the malleus, since the axis on wiiich the malleus turns passes through the attach-ment of these two fibrous structures. 4. The posterior ligament of the incus extends from tlie apex of the short process of theincus to the tympanic wall at the lower part of the mouth of the antrum. It is fan-shaped, theincudal attachment being less extensive than that of the tympanic. The superior ligamentof the incus is variable and

Human anatomy, including structure and development and practical considerations . er with the fibres of the anterior iij^anieiit iyin.^ in the same plane, form the axis-ligament of the malleus, since the axis on wiiich the malleus turns passes through the attach-ment of these two fibrous structures. 4. The posterior ligament of the incus extends from tlie apex of the short process of theincus to the tympanic wall at the lower part of the mouth of the antrum. It is fan-shaped, theincudal attachment being less extensive than that of the tympanic. The superior ligamentof the incus is variable and Stock Photo
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Contributor:

The Reading Room / Alamy Stock Photo

Image ID:

2ANEPYP

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7.1 MB (347.9 KB Compressed download)

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Dimensions:

1863 x 1341 px | 31.5 x 22.7 cm | 12.4 x 8.9 inches | 150dpi

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Human anatomy, including structure and development and practical considerations . er with the fibres of the anterior iij^anieiit iyin.^ in the same plane, form the axis-ligament of the malleus, since the axis on wiiich the malleus turns passes through the attach-ment of these two fibrous structures. 4. The posterior ligament of the incus extends from tlie apex of the short process of theincus to the tympanic wall at the lower part of the mouth of the antrum. It is fan-shaped, theincudal attachment being less extensive than that of the tympanic. The superior ligamentof the incus is variable and consists chiefly of a fold of mucous meml)raiu-. The Intratympanic Muscles.—The muscles within the tym])anum connected with thgossicles (imisciili ossiculoniin aiuiitus) are: (i) the tensor /ympani , ui (2) iha s/apedi//s. The tensor tympani is a diminutive spindle-shaped muscle, about 1.25 cm. long, lying in thebony canal directly above the osseous part of the Eustachian tube, from which it is partly Fig. 1259. Facial nerve Ramus iitriculusampulla ris ? 1 , auditory canal. Lowest part ofspiral lamina Beginning ofposteriorampulla Secondary tym-panic memhrane _-.— Iromontorv j R*V Drum-head or Tympanic cavity Vertical section through human middle and internal ear. X 5)4. Drawn from preparation made by Dr. Ralph Butler. separated by the bony scroll, the processus cochleariforniis. The posterior fibres arise fromthe top of the cartilage of the Eustachian tube and the adjoining part of the great wing of thesphenoid. Sotne of the fibres are connected with the tensor palati muscle and others arisefrom the wall of the canal which the muscle occupies. The fibres converge in a feather-likemanner to the tendon, which begins within the muscle about the middle of the canal, and, pass-ing through the tympanic opening of the canal, turns at nearly a right angle over the end orrostrum of the processus cochleariforniis to be inserted into the anterior part of the innermargin of the malle

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