Assertion: metacarpal's surface | /r/HasAspect | groove
Facets:
Source sentences:
text: The volar surface of the head has a groove in the middle line for the passage of the flexor tendons.
text: The proximal phalanx of the main digits (II - V) have a concave articular surface and the palmar border has a groove to accomodate the articular surface of the metacarpus when the joint is fixed.