The hallucal interphalangeal sesamoid.
D006214:Hallux / Q000033:anatomy & histology*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D012716:Sesamoid Bones / Q000033:anatomy & histology*; D013710:Tendons / Q000033:anatomy & histology*; D014034:Toes / Q000033:anatomy & histology*