The eyebrow is the fold of skin that covers the supraorbital margin. The hairs that spring from it have a lateral inclination; in elderly people – especially men – they are thicker and longer than in young people. The superciliary margin is the thick, curved region of bone placed a little above the medial part of the supraorbital margin. It is poorly marked (or even absent in women), but is strongly marked in men, and is seen better when the eyebrow is marked down. The smooth area between the right and left arches is called the glabella.