. Cunningham's Text-book of anatomy. Anatomy. 188 OSTEOLOGY. behind the zygomatic process of the frontal bone above; inferiorly it passes through the alveolar process of the maxilla in the interval between the first and second molar teeth. The cranial, orbital, nasal, and maxillary cavities are all ex- posed, together with the roof of the mouth. The anterior cranial fossa is deepest in its centre, where its floor is formed by the cribriform plate of the ethmoid ; this corre- sponds to the level of the zygo- matico-frontal suture laterally. On either side the floor of the fossa bulges upwards,
. Cunningham's Text-book of anatomy. Anatomy. 188 OSTEOLOGY. behind the zygomatic process of the frontal bone above; inferiorly it passes through the alveolar process of the maxilla in the interval between the first and second molar teeth. The cranial, orbital, nasal, and maxillary cavities are all ex- posed, together with the roof of the mouth. The anterior cranial fossa is deepest in its centre, where its floor is formed by the cribriform plate of the ethmoid ; this corre- sponds to the level of the zygo- matico-frontal suture laterally. On either side the floor of the fossa bulges upwards, owing to the arching of the roof of the orbit. Of the orbital walls, the lateral is the thickest and stoutest; the superior, medial, and inferior walls, which separate the orbit 12 from the cranial cavity, the eth- moidal cells, and the maxillary 13 sinus, respectively, are all thin. The cavity of the maxillary- sinus lying to the lateral side of the nasal cavity is well seen. Its roof, which separates it from the orbital cavity, is thin and traversed by the infraorbital canal. Its medial wall, with which the inferior concha articu- lates, is very slender, and forms the lateral walls of both the middle and inferior meatuses of the nose. Its lateral wall is stouter where it arches up to bracket the temporal process of the zygomatic bone. Its floor, which rests upon the superior surface of the alveolar border of the maxilla, sinks below the level of the hard palate. The fangs of the teeth sometimes project into the floor of the cavity. The frontal and maxillary bones, where cut, are coloured blue ; The nasal cavities are narrow the ethmoid, inferior conchae, and zygomatics red; the vomer yellow, above, where they lie between the orbital cavities, from which they are separated by the cells within the labyrinth of the ethmoid. The roof which cor- responds to the cribriform plate is narrow, and lies between the septum medially and the lab}T- rinth on either side. At the level of the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
