. Cunningham's Text-book de l'anatomie. L'anatomie. Gorge pour sinus transverse iftf© M7 :. Partie de semi- canal circulaire latéral causé par l'élévation du corps de l'enclume canalis facialis- Canal de muscle tenseur tympanique canal carotidien membrane tympanique" processus styloïde marge postérieure du nerf facial de foramen jugulaire Fig. 1074.-l'article par Petrous passage de l'os temporal de l'adulte. Montrant la relation du tympan du moyen et postérieur fossae du crâne. que la tête du marteau et le corps et de processus court l'enclume sont complètement au-dessus de la membrane tympanique, et qu'ils o

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. Cunningham's Text-book of anatomy. Anatomy. Groove for transverse sinus iftf© M7 :. Portion of lateral semi- circular canal Elevation caused by canalis facialis Body of incus- Canal for tensor tympani muscle Carotid canal Membrana tympani" Styloid process Facial nerve Posterior margin of jugular foramen Fig. 1074.—Section through Petrous Portion of Temporal Bone of Adult. Showing the relation of the tympanum to the middle and posterior fossae of the skull. that the head of the malleus and the body and short process of the incus are altogether above the tympanic membrane, and that they occupy the tympanic attic or epitympanic space (Fig. 1074). At the junction of the two upper quadrants of the membrane is the handle of the malleus, which is directed downwards, backwards, and medially. The lateral process of the malleus is directed laterally a little below the deepest part of the roof of the osseous external acoustic canal. Opposite the postero-superior quadrant are the long limb of the incus, which descends behind and almost parallel to the handle of the malleus, and the stapes, which is directed medially and slightly backwards to the fenestra ovalis. The chorda tympani nerve runs from behind forwards between the lateral surface of the superior part of the long limb of the incus and the medial surface of the neck of the malleus. At the deepest part of the roof of the osseous canal, above the chorda tympani nerve and the short process of the malleus, is a notch (notch of Bivimis), which is occupied by the flaccid and highest portion of the membrana tympani (Shrapnell's membrane). Opposite the postero-inferior quadrant of the drum-head is the promontory of the cochlea, below and behind which is the fenestra rotunda. Opposite the antero- saperior quadrant are the processus cochleariformis, the tendon of the tensor tympani, and the passage leading towards the auditory tube. The labyrinthine wall of the tympanic cavity is related to the internal ear. The tegment

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