. Cunningham's Text-book de l'anatomie. L'anatomie. CEANIUM FKONTAL ARTICLES DE LA. 191 La figure suivante (Fig. 179) affiche la surface antérieure de l'article juste derrière que décrit ci-dessus. Dans le centre est considéré le corps du sphenoid, et la paroi postérieure du sinus est maintenant exposée ; d'un côté ou de l'apex de la partie petrous de la contiguïté temporelle sur le côté du corps du sphenoid, et le grand orifice de la canal carotidien est vu ouvrant sur la paroi postérieure du foramen lacerum, qui est ici divisé. Dans le renfoncement situé entre la paroi latérale du canal carotidien et

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. Cunningham's Text-book of anatomy. Anatomy. FKONTAL SECTIONS OF THE CEANIUM. 191 The next figure (Fig. 179) displays the anterior surface of the section immediately behind that above described. In the centre is seen the body of the sphenoid, and the posterior wall of the sinus is now exposed ; on either side the apex of the petrous part of the temporal abuts upon the side of the body of the sphenoid, and the large orifice of the carotid canal is seen opening on to the posterior wall of the foramen lacerum, which is here divided. In the recess between the lateral wall of the carotid canal and the spine of the sphenoid is the groove leading into the osseous part of the auditory tube, in front of which the base is pierced by the foramen spinosum. Lateral to the angular spine, the man- dibular fossa is divided and its thin roof displayed. Crossing it transversely is seen the petro- tympanic fissure which divides the fossa into an articular and non-articular part. The floor of the middle cranial fossa is here seen to be formed by the upward slope of the anterior surface of the petrous part of the temporal, which is pierced by the hiatus facialis, and the foramen for the lesser superficial petrosal nerve. On the upper surface of the summit of the petrous part of the temporal the depression for the lodgment of the semi- lunar ganglion is well seen on either side. The last section, the an- terior surface of which Fig. 180 is a representation, passes vertically through the base immediately in front of the root of the styloid process. In the median plane the basi-occipital is divided a little in front of the anterior extremities of the oc- cipital condyles ; its upper sur- face is concave from side to side and forms a wide groove for the medulla oblongata and pons. On either side there is a narrow interval between the lateral edge of the basi-occipital and the posterior border of the petrous part of the temporal, which in life is occupied by dense fibrous tissue; running al

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