Assertion: trapezoid's face | /r/HasProperty | external
Facets:
Source sentences:
text: Triangular and slightly concave upper facet for articulation with the navicular; Lower facet convex in the transverse direction and markedly prolonged from front to back for articulation with the second metacarpal; for the trapezoid, it has an external face, convex; for the large bone, finally, an irregularly flat internal veneer
text: In all its perimeter it articulates with the immediate bones, having the following veneers: on its upper face, a convex and semilunar articular veneer; on its external face, a first, convex facet, located upwards, for the concavity of the scaphoid and a second, smaller, flat facet, located downwards, for the trapezoid; on its internal face, an extensive facet, to which a smaller one is frequently added, for the articulation of this face with the hook bone; on its lower face, three contiguous veneers, but separated by generally very visible ridges, for the second, third, and fourth metacarpals; of these three metacarpal veneers, the middle veneer, destined for the third metacarpal, is wide and triangular, with a posterior base; the external facet, intended for the second metacarpal, is narrow and prolonged from front to back; finally, the internal veneer, destined for the fourth metacarpal, is very small and is limited to the posterior part of the bone.
text: The three non-articular faces are the external, the anterior and the posterior.
text: The three articular faces are: the upper, the lower and the internal.