<prompt> Ossification of proximal end of ulna takes place at what age:10 years12 years13 years16 years  <response>: ANSWER: D 16 yearsREF: Parikh 6th edition page, Cunningham s textbook of anatomy page 213Ossification of ulna:Ulna is ossified by one primary and two or more secondary centers AppearanceFusionProximal ulna secondary center10 years16 yearsBody primary center2nd month of intrauterine lifeAt birthDistal ulna secondary center6 years20-23 yearsUnless specified the age is for male 