Rectus Abdominis Muscle Detail :
Rectus abdominis muscle :
The rectus abdominis muscle, also known as the “abs”, this is a paired muscle running vertically on each side of the anterior wall of the human abdomen. There are two parallel muscles, separated by a midline band of connective tissue called the linea alba. It extends from the pubic symphysis, pubic crest and pubic tubercle inferiorly, to the xiphoid process and costal cartilages of ribs V to VII superiorly. The proximal attachments are the pubic crest and the pubic symphysis. It attaches distally at the costal cartilages of ribs 5-7 and the xiphoid process of the sternum.
The rectus abdominis muscle is contained in the rectus sheath, which consists of the aponeuroses of the lateral abdominal muscles. Bands of connective tissue called the tendinous intersections traverse the rectus abdominus, which separates this parallel muscle into distinct muscle bellies. The outer, most lateral line, defining the “abs” is the linea semilunaris. In the abdomens of people with low body fat, these bellies can be viewed externally and are commonly referred to as “four”, “six”, “eight”, or even “ten packs”, depending on how many are visible; although six is the most common.
The rectus abdominis is a 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.
The upper portion, attached principally to the cartilage of the fifth rib, usually has some fibers of insertion into the anterior extremity of the rib itself.
It’s typically around 10 mm thick or 20 mm thick in young athletes such as handball players
Nerve Supply :
The muscles are innervated by thoraco-abdominal nerves, these are continuations of the T7-T11 intercostal nerves and pierce the anterior layer of the rectus sheath. Sensory supply is from the 7-12 thoracic nerves.
The rectus abdominis is an important postural muscle. It is responsible for flexing the lumbar spine, as when doing a so-called sit up Exercise. The rib cage is brought up to where the pelvis is when the pelvis is fixed, or the pelvis can be brought towards the rib cage (posterior pelvic tilt) when the rib cage is fixed, such as in a leg-hip raise. The two can also be brought together simultaneously when neither is fixed in space.
Sit Up Exercise is Most Common Form Of Exercise Where Rectus Abdominal Musct is Chief Muscle Used In This Action.
Eight Pack Or Six Pack Exercise is most Common And Famous Among People.
Exercise Of Rectus Abdominals :
Sit Up Exercise :
In Supine Position Flexes Both Legas , Hands Behind Head And Flexes The Spine And Heads Towards Knee And Repetation Of Same .
Bilateral Leg Elevation In Supine Postion Uses Lower Abdominals Muscle.
Rectus Abdominis is strong Back Flexor Muscle.
To Reduce Lordosis Strenthening Of Rectus Abdominis Muscle is Required.
strenthening of Rectus Abdominis And Other Back Flexor Muscle is Back Pain is Most Common And Is Called Williams Abdominal Exercise.