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
Where the Boys Are annual spring break. "Where the Boys Are" was one of the first teen films to explore adolescent sexuality and the changing sexual morals and attitudes among American college youth. It won Laurel awards for Best Comedy of the Year and Best Comedy Actress (Paula Prentiss). The main focus of "Where the Boys Are" is the "coming of age" of four girl students at a midwestern university during spring vacation. Merritt Andrews (Dolores Hart), the smart and assertive leader of the quartet, expresses the opinion in class that premarital sex might be something young women should experience. Her speech eventually inspires