. Quain's Elements of anatomy. metimes met with, the floor of whichis not thicker than paper; usually on both sides and symmetrical (Humphry, Med. ChirTrans., 1890). THE FRONTAL BONE. The frontal bone, arching upwards and backwards above the orbits, forms thefore part of the cranium ; it likewise presents inferiorly two thin horizontal laminae,the orlital plates, which form the roofs of the orbits, and are separated by a medianexcavation, the ethmoidal notch. It articulates with twelve bones, viz., posteriorlywith the parietals and sphenoid ; outside the orbits with the malars j and between TH
. Quain's Elements of anatomy. metimes met with, the floor of whichis not thicker than paper; usually on both sides and symmetrical (Humphry, Med. ChirTrans., 1890). THE FRONTAL BONE. The frontal bone, arching upwards and backwards above the orbits, forms thefore part of the cranium ; it likewise presents inferiorly two thin horizontal laminae,the orlital plates, which form the roofs of the orbits, and are separated by a medianexcavation, the ethmoidal notch. It articulates with twelve bones, viz., posteriorlywith the parietals and sphenoid ; outside the orbits with the malars j and between THE FRONTAL BONE. :i7 the orbits, from before backwards, with the nasal, superior maxillary, lachrymal, andethmoid bones. Anterior surface.—The partformiu; the greatest convexity of the forehead oneach side is called the frontal eminence. It is separated by a slight depression belowfrom the sumrciUarij ridge, a curved elevation of varying prominence above the NASAL SPINE/ NASAL SURFACE NASAL NOTCH TROCHLEAR FOSSA FRONTAL SINUS. LACHRYMAL FOSSA tlXT. ANG PROG. ETHMOIDAL NOTCH FiCr. 37.—Frontal bone, fro^ii below. (Drawn by D. Gimn.) | .NASAL MAX.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectanatomy
