Rectus sheath

rectus-sheath

Rectus sheath: It is an aponeurotic sheath formed by the aponeurosis of external oblique, internal oblique and transverses abdominis muscles.

Formation:

Above the costal margin:

  1. Anterior wall: By external oblique aponeurosis.
  2. Posterior wall: Deficient and rectus muscle lies on the costal cartilage.

Between costal margin & arcuate line:

Anterior wall: By-

  • External oblique aponeurosis.
  • Anterior lamina of internal oblique aponeurosis.

Poterior wall: By-

  • Poterior lamina of internal oblique aponeurosis.
  • Aponeurosis of transversus abdominis.

Below the arcuate line:

  1. Anterior wall: By the aponeurosis of all the three flat muscles of abdomen.
  2. Posterior wall: Deficient, the rectus muscle rests on fascia transversalis.

rectus-sheath

Contents:

Muscles:

  • Rectus abdominis.
  • Pyramidalis

Vessels:

  • Superior epigastric vessels.
  • Inferior epigastric vessels.

Nerves:

  • Terminal part of the lower five intercostal nerves and
  • Subcostal nerves.

Functions:

  1. It checks bowing of rectus muscle during its contraction and thus increases the efficiency of the muscle.
  2. It maintains the strength of anterior abdominal wall.

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