Development of the nervous system in humans optical vesicle (which will eventually become the optic nerve, retina and iris) forms at the basal plate of the prosencephalon. In the fifth week, the alar plate of the prosencephalon expands to form the cerebral hemispheres (the telencephalon). The basal plate becomes the diencephalon. The diencephalon, mesencephalon and rhombencephalon constitute the brain stem of the embryo. It continues to flex at the mesencephalon. The rhombencephalon folds posteriorly, which causes its alar plate to flare and form the fourth ventricle of the brain. The pons and the cerebellum form in the upper part of the rhombencephalon, whilst the medulla oblongata forms
If We Are the Body the following week. The song re-entered at number 37 for the chart week of September 6, 2003, In its seventh chart week, "If We Are the Body" advanced to number 24 and in its 10th chart week, it advanced to number seven. In its 12th chart week, "If We Are the Body" reached its peak position of number three on the Hot Christian Songs chart. It also peaked at number three on the "Billboard" Hot Christian AC chart and spent three weeks atop both the "Radio & Records" Christian AC and Christian CHR charts. Casting Crowns has performed "If We