part of part of Homo sapiens calcaneus zone of bone organ sustentaculum tali of calcaneus 2026-03-19T00:00:00Z A zone of bone organ forming a horizontal, shelf-like medial projection of the calcaneus that supports the head and neck of the talus. Its superior surface bears the middle talar articular facet, its inferior surface is grooved for the tendon of the flexor hallucis longus, and it provides attachment for the plantar calcaneonavicular and medial talocalcaneal ligaments. David Osumi-Sutherland