Outlines of human osteology / by F.O. Ward.

  • Frederick Oldfield Ward
Date:
1876
Catalogue details

Licence: Public Domain Mark

Credit: Outlines of human osteology / by F.O. Ward. Source: Wellcome Collection.

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    with the upper border of the zygomatic process, above ■:■ ith the temporal ridge of the frontal. It forms the rerior limit of the temporal fossa, and attaches a strong aponeurosis.* Posterior-inferior, or zygomatic. Thick, especialiv in front, continuous with the lower border of the zygomatic process, and uneven for the attachment of a strong muscle.f 85. Orbitah Process. A thin curved plate which pro- jects backward from the orbitar margin of the bone, at right angles to the posterior surface of the body. Its upper surface, smooth and concave from side to side, con- tributes to the floor, and to the outer wall of the orbit. Its loicer surface, also smooth, but convex, contributes to the temporal fossa. Of its borders, the anterior is identi- cal with the orbitar border of the body already described; the superior is serrated, horizontal, and articulated to the frontal bone just behind its external angular process ; the posterior, also serrated, is vertical, and joins the orbitar plate of the sphenoid ; the inferior (or internal) is serrated hke the former, and horizontal for articulation with the orbitar plate of the superior maxillary bone. At the angle of junction between the two last-mentioned borders (i.e. the sphenoid, and the maxillary), there is generally a very short rounded margin, which forms the anterior boundary of the spheno-raaxillary fissure. Its length varies with the width of the fissure; sometimes it is entirely wanting. In this case the malar bone does not enter into the formation of the fissure, which is then completed in front by the junction of the upper maxillary and sphenoid. (This disposition is sometimes seen in one orbitar fossa, while on the opposite side of the stall the spheno-maxillary fissure is completed by the malar V^one.) Upon the upper surface of the orbitar plate appear the orifices of one or two malar coAials. We have already described similar apertures on the two stirfaces of the \)<Aj ; and may now speak of the canals themselves. Though .seldom entirely wanting, they are very irregular as to size, number, and course. A common disposition is the following. From the hole on the zygomatic surface of the body a canal runs a little way forward and upward, and then divides into two branches, one that ascends to open on the orbitar surface, another that descends to Temporal. 1 t Massotor.
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