. Cunningham's Text-book de l'anatomie. L'anatomie. Le TEMPOEAL LES OS. 129 Infra-temporelle ou Canal surface zygomatique pour tytnpani chorda tube auditif canal carotidien sur la face inférieure de la partie petrous, qui est limité en avant par le bord antérieur vers le dedans, la plaque tympanique latéralement, et derrière par la frontière postérieure, les structures suivantes sont à noter :-jaillissant des sur- et sa gaine est arrondi par le processus styloideus mince et pointu, dont la longueur varie beaucoup. La projection vers le bas et légèrement vers l'avant et le dedans, il offre des pièces jointes pour le stylo-glossu

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. Cunningham's Text-book of anatomy. Anatomy. THE TEMPOEAL BONES. 129 Infra-temporal or zygomatic surface Canal for chorda tytnpani Auditory tube Carotid canal On the inferior surface of the petrous part, which is bounded in front by the anterior border medially, the tympanic plate laterally, and behind by the posterior border, the following structures are to be noted:—Springing from and sur- rounded by its sheath is the slender and pointed processus styloideus, the length of which varies much. Projecting downwards and slightly forwards and medially, it affords attachments for the stylo-glossus, stylo-hyoid, and stylo-pharyngeus muscles, as well as the stylo-hyoid and stylo-mandibular ligaments. Just behind it, and between it and the mastoid process, is the foramen stylomastoideum, which lies at the anterior end of the mastoid groove, and transmits the facial nerve and the stylo-mastoid artery. Just medial to the styloid process there is a deep, smooth, excavated hollow, the fossa jugularis, which is converted into a foramen (jugular) by articulation with the occipital bone. Behind and lateral to the fossa there is a small quadrilateral surface Of Variable Size, Which is Temporal surface united to the extremity of the jugular process of the exoccipital by a synchon- drosis. Inside the fossa, on its lateral aspect, or placed on its lateral border, is the opening of a small canal (canaliculus mastoideus), which passes outwards to open into the canalis facialis, and transmits the auricular branch of the vagus, which ultimately escapes through the petro-mastoid fissure (vide ante). In front of the jugular fossa and separ- ated from it by a sharp crest, and just medial to the tympanic plate, is the circu- lar opening of the inferior orifice of the canalis caroti- cus (carotid canal). Directed at first upwards, this canal bends at a right angle and turns forwards and inwards, lying parallel to the anterior angle; reaching the anterior part of the apex of the bone, it op

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