The proximal metatarsal sesamoid of the domestic ruminants.  Is it the vestige of a second metatarsal?
D000818:Animals; D004838:Epiphyses; D006652:Histological Techniques; D006801:Humans; D008682:Metatarsal Bones; D008684:Metatarsus / Q000033:anatomy & histology*; D012418:Ruminants; D012716:Sesamoid Bones / Q000033:anatomy & histology*
METATARSUS/anatomy and histology; SESAMOID BONES/anatomy and histology