![]() ![]() Posterior fontanelle: the soft region on the back of the infant’s head.Anterior fontanelle: the soft region on the front of the infant’s head.Base: the sphenoid, ethmoid, occipital and temporal bones tend to grow slightly laterīy week 37, the cartilaginous frame for the skull is almost entirely replaced by bone, and only two relatively small cartilaginous structures remain:.Calvarium (roof): the frontal, occipital and parietal bones tend to grow slightly earlier.This process occurs at different rates in two different regions of the skull: A cartilaginous mould begins to grow and is slowly replaced by bone in a process called intramembranous ossification. The skull begins to form prior to week 12 of embryogenesis. ![]() You might also be interested in our Anatomy Flashcard Collection which contains over 2000 anatomy flashcards in addition to advanced features such as spaced repetition. ![]()
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