Lateral part of glenoid cavity of proximal phalanx

In horses, for several authors like Barone or JM Denoix, the proximal articular surface of the proximal phalanx is not described as a simple articular fovea (as listed is in the NAV), but as an articular surface including a medial and a lateral glenoid cavity separated by the proximal sagittal groove of proximal phalanx.