rectus abdominis muscle

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Related to rectus abdominis muscle: Pyramidalis muscle

rec·tus ab·dom·i·nis mus·cle

(rek'tŭs ab-dom'i-nis mŭs'ĕl)
Muscle of ventral abdominal wall, flanking the linea alba, characterized by tendinous intersections separating its length into multiple bellies; origin, crest and symphysis of the pubis; insertion, xiphoid process and fifth to seventh costal cartilages; action, flexes lumbar vertebral column, draws thorax downward toward pubis; nerve supply, thoracoabdominal nerves.
Synonym(s): musculus rectus abdominis [TA] , rectus muscle of abdomen.

rectus abdominis muscle

Abdominal wall muscle. Origin: crest and symphysis of pubis. Insertion: xiphoid process, costal cartilages 5-7. Nerve: spinal T7-T12. Action: tenses abdomen, flexes vertebral column.
See also: muscle


[L.] straight.

rectus abdominis muscle
see Table 13.2.
ocular rectus muscle
see Table 13.1F.
rectus sheath
the sleeve of fascia which surrounds the rectus abdominis muscle and which is derived from the aponeurotic tendons of the other abdominal muscles.
References in periodicals archive ?
We then selected dependent variables that would capture the characteristics of the EMG signals from the rectus abdominis muscle portions according to the exercise, intensity, and presence of fatigue.
The EMG signals from two portions of the right side of the rectus abdominis muscle were amplified and bandpass filtered (10 to 500 Hz) with Nihon MEB 4200 (Nihon-Kohden, Japan) and digitized with a 2 kHz sampling rate.
The relationship between the activation of the two portions of the rectus abdominis muscle during the different tasks were compared by amplitude and cross-correlation analyses between the EMG signals that were recorded from the two portions.
in this condition, the subjects were unable to maintain rectus abdominis muscle activation to produce the specified force level for more than 60 s.
The force that was produced and the EMG activities of the upper and lower portions of the right side of the rectus abdominis muscle were acquired simultaneously during the exercises.
The average muscle activity during this exercise for the rectus abdominis muscle was 8.
Therefore, because the oblique muscles were used to stabilize the core while the rectus abdominis muscle was contracting, muscle use and total work were greater.
In Figures 9 and 10, when exercise was varied from 50 to 90 degrees, although the rectus abdominis muscle activity increased dramatically, there was almost no increase in back extensor activity.
The greatest average muscle activity facing forward was for the rectus abdominis muscles averaging 23.
Abdominal crunch machines [ILLUSTRATION FOR FIGURE 3 OMITTED] are also a very popular way to develop the rectus abdominis muscles.
Leg raises are another excellent exercise for developing the rectus abdominis muscles.