Reeks, Harry Caulton / 2008-11-11 00:00:00

In the recent
state it is covered by the sensitive sole. The posterior region, lying
immediately behind the semilunar crest, shows on each side of a median
process a large foramen, the _Plantar Foramen_. From this foramen runs the
_Plantar Groove_, a channel, bounded above by the superior edge, and below
by the semilunar crest of the bone, which conducts the plantar arteries
into the _Semilunar Sinus_, a well-marked cavity in the interior of the
bone.
_The Superior or Articular Surface_ consists of two shallow depressions,
divided by a slight median ridge. Its posterior part shows a transversely
elongated facet for articulation with the navicular bone.
_The Superior Edge_, outlining the superior margin of the laminal surface,
describes a curve, with the convexity of the curve forward. In the centre
of the curve is a triangular process, the _Pyramidal Process_, which serves
as the point of attachment of the extensor pedis.
_The Inferior Edge_, the most extensive of the three, separates the laminal
from the solar surface. It is semicircular in shape, sharp, and finely
dentated, and is perforated by eight to ten large foraminae.
_The Posterior Edge_, very slightly concave, divides the small,
transversely elongated facet of the superior surface from the posterior
region of the inferior surface.
_The Lateral Angles_ of the bone, also termed the _Wings_, are two
projections directed backwards.
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