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[[File:Fetal_head_lateral.jpg|thumb|alt=12 week fetal skull|300px|Fetal Head (12 weeks) showing cartilage (blue) and bone (red)]] ...{intramembranous ossification}}. While the bones that form the base of the skull are formed by {{endochondral ossification}}.

| [[File:Stage16-18 face 02.jpg|right]] ! Historic - cartilaginous and membranous skull

...urement of Abdominal Circumference (AC) is used to determine fetal age and normal development (small/large/abnormal) parameters. Measured at the outer edge o :A medical procedure in which a physiologic solution (such as normal saline) is infused into the uterine cavity to replace the amniotic fluid.