Conjoint tendon is formed by joining of the lower tendinous fibers of internal oblique muscle and the lower part of aponeuorsis of transversus abdominis muscle. It is attached to the pubic crest and pectineal line. It lies immediately behind the superficial inguinal ring and forms the medial part of the posterior wall of the inguinal canal.
Medially, the upper fibers of the tendon fuse with the anterior wall of the rectus sheath, and laterally some fibers may blend with the interfoveolar ligament.
The conjoint tendon is of great clinical significance. It serves to protect what would otherwise be a weak point in the abdominal wall.