This is the collection of the aponeurosis of the anterior abdominal wall muscle

bullet The anterior wall is formed by the external oblique aponeurosis and also
bullet The anterior lamella of the internal oblique aponeurosis
bullet Posterior wall of the sheath is formed by the transversus abdominis  aponeurosis and the posterior lamella of the internal oblique aponeurosis . The posterior wall of the rectus sheath disappears at the midpoint between the umbilicus and symphysis pubis so that all aponeurosis below this point run anteriorly to form the anterior wall of rectus sheath. The point of departure of rectus sheath posteriorly is called the arcuate line of Douglas. Below this point there is no posterior wall of rectus. The rectus abdominis muscles lie directly on the transversalis fascia. Hence we have the various walls of the rectus sheath as follows

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.

Content

Rectus sheath contains

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Rectus abdominis

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Inferior epigastric artery

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Superior epigastric artery

Blood supply

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Inferior and superior epigastric arteries

Veins

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Superior and inferior epigastric veins

Nerves

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T7 nerve ventral ramus

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T8 nerve ventral ramus

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T9 nerve ventral ramus

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T10 nerve ventral ramus

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T11 nerve ventral ramus

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T12 nerve ventral ramus, especially for pyramidalis

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L1 nerve ventral ramus, especially for conjoint tendon of internal oblique and transversus abdominis at the roof of inguinal canal. The L1 nerve is divided into

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Ilioinguinal nerve

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Iliohypogastric nerve

 

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1 Rectus abdominis 2 Linea alba 3 Tendinous intersection 4 Transversus abdominis 5 Inguinal ligament 6 Spermatic cord

 

 

 

 

 

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