This is the collection of the aponeurosis of the anterior abdominal wall muscle
1. Above the costal margin- we have the posterior wall formed by the 5-7th costal cartilages, anterior surfaces. It has only external oblique aponeurosis as its anterior wall
2. Below the costal margin, we have the regular sheath with the external oblique aponeurosis and internal oblique anterior lamella. The posterior wall is formed by the transversus abdominis and the posterior lamella of the internal oblique.
3. Below the arcuate line- there is no posterior wall of rectus sheath.
Rectus sheath contains
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