Membraneous gap seen between fetal skull bone is known as

Ans) a (Fontanelle) Ref D.C. Dutta p84,Nehon 18th ed p 677Flat bones of the vault are united together by nonossified membranes attached to the margin of the bone.These are called sutures and fontanelles.Wide gap in the suture line is called fontanelleCraniosynostosis is defined as premature closure of the cranial suturesDisorders Associated with a Large Anterior FontanelAchondroplisinIntrauterine growth retardationApert syndromeKenny syndromeAthyrotic hypothyroidismOsteogenesis imperfectnCleidocrininl dysostosisPrematurityCongenital rubella syndromePylenodysctslosisHallermantl-Sucill syndromeRussell-Silver syndromeHydrocephaly13-, 18-, 21-trisoniesHypophospnatasiaVitamin D deficiency ricketsPersistently small fontanels suggest microcephaly, craniosynostosis, con-genital hyperthyroidism, or wormian bones. A 3rd fontanel suggests trisomy 21 but is seen in preterm infants. Soft areas in the occipital region suggest the irregular calcification and wonnian bone formation.Important causes of wonnian bones Hypothyroidism/ cretinismHypophosphatasia RcketsCliedocraniodysostosis / pyknodysostosis Osteogenesis imperfecta