. Cunningham's Text-book of anatomy. Anatomy. THE FKONTAL BONE. 117 ethmoid. On either side of the root of this process the pars nasalis (nasal part) of the bone is grooved obliquely from above downwards and forwards, and enters into the formation of the narrow roof of the nasal cavity. Anteriorly the nasal notch is limited by a rough U-shaped serrated surface, the medial part of which articulates with the nasal bones, whilst on either side the frontal processes of the maxillae are united with it. Behind this, amid the broken cells, the passages leading into the frontal sinuses are readily dis
. Cunningham's Text-book of anatomy. Anatomy. THE FKONTAL BONE. 117 ethmoid. On either side of the root of this process the pars nasalis (nasal part) of the bone is grooved obliquely from above downwards and forwards, and enters into the formation of the narrow roof of the nasal cavity. Anteriorly the nasal notch is limited by a rough U-shaped serrated surface, the medial part of which articulates with the nasal bones, whilst on either side the frontal processes of the maxillae are united with it. Behind this, amid the broken cells, the passages leading into the frontal sinuses are readily distinguished, and here the medial edges of the orbital plates articulate with the lacrimal bones. The orbital part is thin and brittle. Anteriorly it is bounded by the supraorbital margin, just within which, midway between the medial angular process and the supraorbital notch, there is a small shallow depression (fovea trochlearis), often displaying a spicule of bone arising from its edge (spina trochlearis), which affords attachment to the pulley of the superior oblique muscle of the eyeball. Laterally the orbital part is overhung by the supraorbital margin and the zygomatic process, and in the hollow so produced (fossa glanduhe lacrimalis) the lacrimal gland is lodged. The extremity of the zygomatic process articulates with the frontal process of the zygomatic bone. For articulation with small wing of sphenoid Sagittal sulcus and attach- ment of falx cerebri. Orbital surface^ "^ \\#isLSii*.â â :,'â â 4tr Temporal surface Lateral angular or zygomatic process Surface for articula- tion with great wing of sphenoid Fossa of the lacrimal gland Ethmoidal foramina Ethmoidal notch Supraorbital notch Trochlear pit Frontal sinus' f\W Nasal surface T Nasal notch Frontal spine Fig. 129.âThe Frontal Bone as seen from below. Behind this the irregular edge of the orbital surface is united with the great wing of the sphenoid by a triangular area, which also extends on to the inferior
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
