Brain vessels enter the central nervous system through holes in the meningeal layers. The cells in the blood vessel walls are joined tightly to one another, forming the blood–brain barrier, which blocks the passage of many toxins and pathogens (though at the same time blocking antibodies and some drugs, thereby presenting special challenges in treatment of diseases of the brain). Neuroanatomists usually divide the vertebrate brain into six main regions: the telencephalon (cerebral hemispheres), diencephalon (thalamus and hypothalamus), mesencephalon (midbrain), cerebellum, pons, and medulla oblongata. Each of these areas has a complex internal structure. Some parts, such as the cerebral cortex
If We Are the Body the Body" received positive reviews from music critics, who praised its lyrics and arrangement, and it was nominated for the awards for Song of the Year and Pop/Contemporary Recorded Song of the Year at the 35th GMA Dove Awards. The song spent three weeks at number one on the "Radio & Records" Christian AC and Christian CHR charts and peaked at number three on the "Billboard" Hot Christian Songs and Hot Christian AC charts. According to lead singer Mark Hall, "If We Are the Body" was originally written for use as a "teaching tool" in his youth group. Hall, a