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The rectus sheath (also called the rectus fascia [1]) is a tough fibrous compartment formed by the aponeuroses of the transverse abdominal muscle, and the internal and external oblique muscles. It contains the rectus abdominis and pyramidalis muscles, as well as vessels and nerves.
The arcuate line of rectus sheath (the arcuate line or the semicircular line of Douglas) is a line of demarcation [1] corresponding to the free inferior margin of the posterior layer of the rectus sheath [2] inferior to which only the anterior layer of the rectus sheath is present [3] and the rectus abdominis muscle is therefore in direct contact with the transversalis fascia. [1]
Diagram of a transverse section of the posterior abdominal wall, to show the disposition of the lumbodorsal fascia. Diagram of sheath of Rectus. Diagram of a transverse section through the anterior abdomina wall, below the linea semicircularis.
The linea alba is formed by the union of aponeuroses (of the muscles of the anterior abdominal wall [2]) that collectively make up the rectus sheath. The linea alba attaches to the xiphoid process superiorly, and to the pubic symphysis inferiorly. It is narrow inferiorly where the two recti abdominis muscles are in contact with each other ...
In anatomy, the abdominal wall represents the boundaries of the abdominal cavity.The abdominal wall is split into the anterolateral and posterior walls. [1]There is a common set of layers covering and forming all the walls: the deepest being the visceral peritoneum, which covers many of the abdominal organs (most of the large and small intestines, for example), and the parietal peritoneum ...
rectus, medial: head, eye, orbit (left/right) annulus of Zinn at orbital apex 5.5 mm medial to corneal limbus: ophthalmic artery: oculomotor nerve [CNIII], inferior branch: adducts eye: Oblique Superior and inferior 2 1 rectus, lateral: head, eye, orbit (left/right) annulus of Zinn at orbital apex 7 mm temporal to corneal limbus: ophthalmic artery
The lateral border of the rectus sheath is part of the recently described EIT ambivium to more precisely describe this important part of the anterior abdominal wall. [1] The EIT ambivium is formed by the Musculus Obliquus Externus (MO E ), the Musculus Obliquus Internus (MO I ) and the Musculus Transversus Abdominis ( T A).
The aponeurosis of the abdominal external oblique muscle is a thin but strong membranous structure, the fibers of which are directed downward and medially.. It is joined with that of the opposite muscle along the middle line, and covers the whole of the front of the abdomen; above, it is covered by and gives origin to the lower fibers of the pectoralis major; below, its fibers are closely ...