Linea alba is a term used to describe the midline of the human abdomen. It runs vertically from the pubic symphysis to the xiphoid process of the sternum and is primarily composed of connective tissue. There are several synonyms used to describe linea alba, including white line, medial line, rectus sheath median fibrous septum, and midline abdominal seam. White line is the most commonly used synonym, and it is so named because it appears as a thin, white band when viewed externally. The other synonyms describe the anatomical properties of the structure and are often used interchangeably in medical literature.