The abs, as they are commonly referred to, is a group of muscles which both sexes and all age groups are obsessed with. The abdominal is what transfers power from the lower body on to the torso and vice versa. From a sheer aesthetic point of view, the contribution of the abdominal area cannot be denied. Along with its different muscles, it constitutes what we call the core of the body. The different muscles of the abdomen are:
TRANSVERSE ABDOMINUS -
The transverse abdominus is the deepest of the abdominal group lying below the internal oblique. It runs from the inner surface of the lower coastal cartilages, the thoracolumbar fascia and iliac crest horizontally to the linea Alba. It basically inserts into the xiphoid process, linea Alba and pubic symphysis. The function of this muscle is stabilization and bracing of the trunk.
RECTUS ABDOMINUS -
The Rectus is a paired muscle with the fibres running vertically down and divided by a midline band of the connective tissue known as the linea Alba. It originates at the pubis and inserts into the coastal cartilage of the fifth to the seventh ribs and xiphoid process of the sternum. The rectus is also usually crossed by 3 fibrous bands which make a cross inscription that creates the “six-pack” look of the frontal abdominal wall. These muscles work when we flex our trunk, such as during reverse crunches and crunch situps.
EXTERNAL OBLIQUE -
It originates from the 5th to 12th rib ventromedially to the anterior layer of the rectus sheath and inserts into the iliac crest and abdominal aponeuroses to linea alba. The function of this muscle is trunk rotation and trunk lateral flexion, which can be done in lateral flexion on back extension machine and twisting crunch sit ups etc.
INTERNAL OBLIQUE -
It originates from the inguinal ligament, iliac crest and the lumbodorsal fascia and inserts into the linea Alba, xiphoid process and lower four ribs. The function of this muscle is trunk rotation as done in twisting crunch sit up. The internal and external oblique work together to rotate the trunk in the following way – to turn the left shoulder towards the right hip, the right internal oblique contracts with the left external oblique to create this torsional movement. Thus, the internal oblique’s are also called the same side rotators.