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The rectus abdominis has many sources of arterial blood supply. Classification of the vascular anatomy of muscles: First, the inferior epigastric artery and vein (or veins) run superiorly on the posterior surface of the rectus abdominis, enter the rectus fascia at the arcuate line, and serve the lower part of
They supply the rectus abdominis and end as the anterior cutaneous branches of the abdomen; they supply the skin of the front of the abdomen. The lower intercostal nerves supply the intercostales and abdominal muscles; the last three send branches to the serratus posterior inferior. About the middle of their course they give off lateral ...
rectus abdominis: 2 1 iliocostalis lumborum Torso, Back, right/left sacrum, iliac crest, thoracolumbar fascia, spinous processes: The lower six or seven ribs: lateral sacral artery: posterior branch of spinal nerve: extends/flexes vertebral column: rectus abdominis: 2 1 iliocostalis thoracis Torso, Back, right/left
Muscles Worked: Transverse abdominis, rectus abdominis, internal and external obliques, triceps, scapular muscles and glutes. This move will also help improve hip mobility. This move will also ...
A posterior rectus sheath composed of the posterior portion of the aponeurosis of the internal oblique muscle and the aponeurosis of the transversus abdominis passes behind the rectus abdominis muscle. [2] [3] All aponeuroses of the rectus sheath unite at (and and decussate across) the midline, forming the linea alba. [3] Below the arcuate line
The linea alba is a white, fibrous band that is made of the bilateral rectus sheaths that join at the anterior midline of the body. These enclose the rectus abdominis muscles (a pair of long, linear muscles, commonly called the “sit-up” muscles) that originate at the pubic crest and pubic symphysis, and extend the length of the body’s trunk.
Secondly, its contraction causes ipsilateral rotation and side-bending. It acts with the external oblique muscle of the opposite side to achieve this torsional movement of the trunk. For example, the right internal oblique and the left external oblique contract as the torso flexes and rotates to bring the left shoulder towards the right hip.
As the superior (or proximal) pair of rectus abdominis muscles contract, the vertebral column is able to slightly flex forward. [citation needed] If more forward flexion is needed, the middle pair of rectus abdominis muscles can contract along with the distal pair to allow the vertebral column to flex forward even further. [citation needed]