A manual of anatomy . alis, quadratus labii inferioris, triangularis,platysma, buccinator, masseter, orbicularis oris, geniohyoglossus, geniohyoideus,mylohyoideus, digastricus, constrictor pharyngeus superior, temporalis andpterygoidei medialis and lateralis (sixteen pairs). THE SKULL AS A WHOLE Only a general description of the skull in various views will begiven, as frontal, lateral, occipital, basal, medial and internal. The frontal aspect {norma frontalis) exhibits the following impor-tant features for consideration: The frontal region, the orbital fossae,pyriform aperture and dental arche
A manual of anatomy . alis, quadratus labii inferioris, triangularis,platysma, buccinator, masseter, orbicularis oris, geniohyoglossus, geniohyoideus,mylohyoideus, digastricus, constrictor pharyngeus superior, temporalis andpterygoidei medialis and lateralis (sixteen pairs). THE SKULL AS A WHOLE Only a general description of the skull in various views will begiven, as frontal, lateral, occipital, basal, medial and internal. The frontal aspect {norma frontalis) exhibits the following impor-tant features for consideration: The frontal region, the orbital fossae,pyriform aperture and dental arches. 68 OSTEOLOGY The frontal region, above the level of the orbits, is convex in bothdirections and its breadth and height vary in the different lower border is sharply outlined, on each side, by the supraorbi-tal margins, each of which shows the supraorbital notch (incisurasupraorbitalis). In the median line, near the lower margin is theglabella and passing to each side from this are the superciliary Fig. 47.—The skull seen from in front. iSoboUa and McMurrich.) The lateral borders of the frontal region are sharp, below, but notabove; no superior border is present as the curve of the bone blendswith the vertex. The orbital fossae (two) are pyramidal in shape with the base(orbital aperture) at the face and the apex directed backward andmedially. The apex is practically the optic foramen (for the opticnerve and ophthalmic artery); below and medial to this is thesuperior orbital fissure, for the oculomotor, trochlear, ophthalmicdivision of the trigeminal, and the abducens nerves and the ophthal-mic veins. In the temporal part of the orbit is the fossa for the lacri-mal gland. The roof is formed by the orbital portion of the frontal THE SKULL AS A WHOLE 69 bone and the small wing of the sphenoid. The floor is formed by theorbital surfaces of the maxilla and zygomatic bones and the orbitalprocess of the palatal bone. Here is seen the inferior orbital fissurethat
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
