Rectus Sheath Flashcards
What is rectus sheath
Aponeurotic sheath covering the rectus abdominis. Has 2 walls
Features of anterior and posterior wall
Anterior- complete
Composition variable
Firmly adherent to tendinousintersection
Posterior incomplete
Free from rectus muscle
What are the 3 levels
Above costal margin
Between costal m and actuate line
Below arch are line
Above arch are line
Ant wall - external oblique
Post- deficient rests on 5,6,7 costal cartilage
Between costal and artiste
Ant- external oblique
Anterior lamina of internal oblique
Post- post lamina of internal oblique
Transversus abdominus
Arcuate line here
Below arcuate line
Ant- ext
Fused aponeurosis of internal and transversus
Posterior- fascia transversalis
What is arcuate line or linea semicircular is or pouch of Douglas
Horizontal line midway between umblicus and pubic symphysis. The posterior lamina ends in this free curved margin called arcuate line
Contents of rectus sheath
Rectus abdominus
Pyramidalis
Arteries supplying rectus sheath
Superior and inferior epigastric
Nerves supplying rectus sheath
T7-T12 lower 5 intercostal and subcostal
Functions
Checks bowing of rectus
Strength to ant abd wall
New concept of rectus sheath
Decussating fibres of 3 muscles each forming a bilaminar aponeurosis
Anterior wall-2 leaves of EOM and Ant leaf of IOM
Posterior wall- post leaf of IOM and transversus 2 leaves
