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The rectus abdominis is a very long flat muscle, which extends along the whole length of the front of the abdomen, and is separated from its fellow of the opposite side by the linea alba. Tendinous intersections (intersectiones tendineae) further subdivide each rectus abdominis muscle into a series of smaller muscle bellies.
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 (MOE), the Musculus Obliquus Internus (MOI) and the Musculus Transversus Abdominis (TA). Understanding the ...
Region Illustration Description Above the arcuate line: At the lateral border of the rectus abdominis muscle, the aponeurosis of the internal oblique muscle splits into an anterior layer and a posterior layer (this splitting forms a shallow groove - the semilunar line).
Medial border: Lateral margin of the rectus sheath. [1] [2] Superolateral border: Inferior epigastric vessels. [1] [2] Inferior border: Inguinal ligament. [1] [2] This can be remembered by the mnemonic RIP (Rectus sheath (medial), Inferior epigastric artery (lateral), Poupart's ligament (inguinal ligament, inferior).
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]
Abdominal muscles cover the anterior and lateral abdominal region and meet at the anterior midline. These muscles of the anterolateral abdominal wall can be divided into four groups: the external obliques , the internal obliques , the transversus abdominis , and the rectus abdominis .
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 ...
rectus abdominis: 2 1 longissimus capitis Torso/Neck, Back, right/left articular processes of C4-C7; transverse processes of T1-T5 posterior margin of mastoid process: lateral sacral artery: posterior branch of spinal nerve: extends/flexes vertebral column, flexes head and neck to same side rectus abdominis: 2 1 longissimus colli Torso, Back ...