. Anatomy, descriptive and applied. Anatomy. THE MAXILLA 101 formation of two fossae, the zygomatic and sphenomaxillary, and two fissures, the sphenomaxillary and pterygomaxillary. The bone presents for examination a body and four processes—malar, nasal, alveolar, and palatal. The Body (corpus maxillae).—The body is somewhat cuboid and is hollowed out in its interior to form a large cavity, the antrum of Highmore {sinus maxillaris). Its surfaces are four—an external or facial, a posterior or zygomatic, a superior or orbital, and an internal or nasal. Surfaces.—The facial surface (fades anterio
. Anatomy, descriptive and applied. Anatomy. THE MAXILLA 101 formation of two fossae, the zygomatic and sphenomaxillary, and two fissures, the sphenomaxillary and pterygomaxillary. The bone presents for examination a body and four processes—malar, nasal, alveolar, and palatal. The Body (corpus maxillae).—The body is somewhat cuboid and is hollowed out in its interior to form a large cavity, the antrum of Highmore {sinus maxillaris). Its surfaces are four—an external or facial, a posterior or zygomatic, a superior or orbital, and an internal or nasal. Surfaces.—The facial surface (fades anterior) (Fig. 70) is directed forward and outward. It presents at its lower part a series of eminences corresponding to the position of the anterior five teeth. Just above those for the incisor teeth is a depression, the incisive fossa, which gives origin to the Depressor alae nasi; and below it to the alveolar border is attached a slip of the Orbicularis oris. Above and a little external to it the Compressor naris arises. More external is another depression, the canine fossa (fossa canina), larger and deeper than the incisive fossa, from which it is separated by a vertical ridge, the canine eminence, corresponding to the socket of the canine tooth. The canine fossa gives origin to the Levator anguli oris. Above the canine fossa is the infraorbital foramen {foramen infraorbiiale), Outer Surface. Incisive Posterior dental canals. Maxillary tuberosity. Fig. 70.—Left maxilla. Outer surface. the termination of the infraorbital canal; it transmits the infraorbital vessels and nerve. Sometimes the infraorbital canal opens by two, very rarely by three, orifices on the face. Above the infraorbital foramen is the margin of the orbit {margo infraorhitalis), which affords partial attachment to the Levator labii superioris. To the sharp margin of bone which bounds this surface in front and separates it from the internal surface is attached the Dilatator naris posterior. The po
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
