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BONES. 83

Just external to the junction of this plate with the nasal process is a
small depression which gives origin to the inferior oblique muscle of
the eye.
The Mesial Border of the orbital surface at its anterior portion is
smooth, and in it is the commencement of the lachrymal groove, which
in the articulated skull becomes a canal and runs downward and slightly
backward to communicate witli the. inferior meatus of the nose. The
remainder of this border is roughened for articulation with the lachry-
mal bone anteriorly and the os planum of the ethmoid bone posteriorly.
The Anterior Border of the orbital plate and the orbital process of
the malar bone from the infraorbital ridge is sharp at its inner third,
but the remainder is rounded.
The Posterior Border of the above plate is frequently referred to as
the outer border : it extends from the centre of the malar process back-
ward and inward to the orbital process of the palate bone. The inar-
ticulated portion of this border, together with part of the orbital process
of the palate bone, forms the anterior boundary of the spheno-max-
illary fissure.
The Proximal or Nasal Surface (Fig. 35) presents a large irregular
opening into the maxillary sinus. This orifice is jDartially closed by
Fig. 35.
:,ti^'^

Bon.. p niurkfd in ourJtut

JEtli.rri/jid
Inferior Turlinaied
jPnlocte

Ant. J\rasa,2S: yni

£ristie
/Jaiscd rhroucfJi,
Ant.palat. Ca?ia7.
Left Superior Maxillary Boue, inner surface.
articulation with the lachrymal, the uncinate process of the ethmoid,
the vertical plate of the palate, and the ethmoidal process of the inferior
turbinated bones of the same side. In the articulated skull one or two
small openings communicate from the antrum with the middle meatus