The conjoint tendon, also known as the inguinal aponeurotic falx or Henle's ligament, is a condensation of tissue that runs through the lateral edge of the lower rectus sheath. It is located in the inferior abdomen and is formed from the common aponeurosis of the internal oblique muscle and transverse abdominis muscle, although they can be separated. The fibers turn inferiorly and insert into the crest of the pubis at the pectineal line immediately deep to the superficial inguinal ring. Medially, the fibers of the conjoint tendon fuse with the anterior wall of the rectus sheath, while laterally, the fibers may fuse with the interfoveolar ligament. The conjoint tendon makes up the main part of the medial portion of the posterior wall of the inguinal canal. The conjoint tendon has an essential role in protecting a weak area in the abdominal wall in which a weakening of the conjoint tendon may lead to a direct inguinal hernia.