. Cunningham's Text-book de l'anatomie. L'anatomie. Le TEMPOEAL LES OS. 131 dans l'os appelé le tympan et formant le tegmen timbales. Latéralement la ligne de fusion de la partie petrous avec le carcinome spinocellulaire se manifeste souvent par une faible et irrégulier des petro-fissure squamous. Face postérieure.-l'objet le plus visible sur la face postérieure de la partie petrous de l'os est le meatus acusticus interims (méat acoustique interne), d'environ 8 mm de profondeur dans l'adulte. Cela a une ouverture ovale oblique, et conduit vers l'extérieur et légèrement vers le bas dans le fond de l'os, donnant passage à la

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. Cunningham's Text-book of anatomy. Anatomy. THE TEMPOEAL BONES. 131 within the bone called the tympanum and forming the tegmen tympani. Laterally the line of fusion of the petrous with the squamous part is often indicated by a faint and irregular petro-squamous fissure. Posterior Surface.—The most conspicuous object on the posterior surface of the petrous part of the bone is the meatus acusticus interims (internal acoustic meatus), about 8 mm. deep in the adult. This has an oblique oval aperture, and leads outwards and slightly downwards into the substance of the bone, giving passage to the acoustic and facial nerves, together with the nervus intermedius and the auditory branch of the basilar artery. The canal appears to end blindly; but if it be large, or still better, if part of it be cut away, its fundus will be seen to be crossed by a horizontal ridge, the falciform crest, which divides it into two fossae, the floors of which (laminae cribrosae) are pierced by numerous small foramina for the branches of the acoustic nerve and the vessels passing to the membranous labyrinth, whilst in the anterior and upper part of the higher fossa the orifice of the canalis facialis, through which the facial nerve passes, is seen leading in the direction of the hiatus canalis facialis (vide supra). Lateral to the internal acoustic meatus and above it, close to the superior border, an irregular depression, often faintly marked, with one or two small foramina opening into it, is to be noticed. This is the fossa subarcuata, best seen in young bones (see Fig. 143 C), where it forms a distinct recess, which is bounded above by the bulging caused by the superior semicircular canal, within the concavity of which it is placed; it lodges a process of the dura mater. Below and lateral to this, separated from it by a smooth, elevated curved ridge, is the opening of the apertura externa aquseductus vestibuli (aqueduct of the vestibule), often concealed in a narrow curved fissure overhun

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