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 high note of A. A CCM song, it has an acoustic rock sound and incorporates the violin, mandolin, and accordion in its arrangement. Featuring "energetic instrumental spurts and tight melodies", the song "admonishes the church for giving preferential treatment to any one particular group over another" and questions why the church does not minister impartially. The song's chorus, which references the Christian concept of the body of Christ, asks "If we are the body, why aren't his arms reaching?/Why aren't his hands healing?/Why aren't his words teaching?/And if we are the body?/Why aren't his feet going?/Why is his love