| Origin Pubic symphysis, pubic crest | Insertion Xiphoid process, costal cartilages of ribs 5-7 | Innervation Intercostal nerves (T7-T11), subcostal nerve (T12) | Blood supply Inferior epigastric and superior epigastric arteries; contributions from posterior intercostal, subcostal and deep circumflex arteries |
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What is the action of the abdominals?
The abdominal muscles
support the trunk, allow movement and hold organs in place by regulating internal abdominal pressure
. The deep abdominal muscles, together with muscles in the back, make up your ‘core’ muscles and help keep your body stable and balanced, and protects your spine.
What’s the origin of the rectus abdominis?
| Rectus abdominis | Origin Crest of pubic | Insertion costal cartilages of ribs 5-7 Xiphoid process of sternum. | Artery inferior epigastric artery | Nerve segmentally by thoraco-abdominal nerves (T7 to T11) and subcostal (T12) |
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What’s the action of the rectus abdominis muscle?
Function. The main action for rectus abdominis is
flexion of the trunk
(flexion of thoracic and lumber spine), while it works by drawing symphysis and Sternum toward each other. Also, it works on posterior pelvic tilt with other abdominal muscles.
What is the origin insertion and action of the external oblique?
| Origin External surfaces of ribs 5-12 | Insertion Linea alba, pubic tubercle, anterior half of iliac crest | Action Bilateral contraction – Trunk flexion, compresses abdominal viscera, expiration Unilateral contraction – Trunk lateral flexion (ipsilateral), trunk rotation (contralateral) |
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What are two benefits of strong abdominals?
- Abdominal Strength Reduces Back Pain. Your abdominals act as an anchor for muscles of the mid and lower back. …
- Supports Quality Posture. …
- Builds Functional Strength. …
- Improves Sports Performance. …
- Creates Better Balance.
Which 2 of the 4 abdominal muscles are responsible for the action of horizontal rotation?
At the lower end the
internal oblique muscle
fibers run almost horizontally. Both the external and internal oblique muscles are involved in flexing the rib cage and the pelvic bones together, sideward bending (lateral flexing) of the trunk, and rotating the trunk.
What are the 4 functions of the rectus abdominis?
| Origin Pubic symphysis, pubic crest | Blood supply Inferior epigastric and superior epigastric arteries; contributions from posterior intercostal, subcostal and deep circumflex arteries | Function Trunk flexion, compresses abdominal viscera, expiration |
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Why is the rectus abdominis important?
The Rectus Abdominis Serves Various Important Purposes in the Human Body. The main function is
moving the trunk backwards, forwards and sideways
. This muscle stabilises the spine and tenses the abdominal wall. It also controls the movement of your pelvis, which affects the curvature of the spine.
Does rectus mean straight?
Rectus means
straight
. The rectus abdominis is a straight abdominal muscle.
How do you engage your rectus abdominis?
Lie down on your back with knees bent and thighs perpendicular to the ground, hands at your sides, and feet on the floor. Contract your abdominal muscles and
raise your hips toward your rib cage
. This will lift your tailbone off the ground and bring knees towards your chest. Hold in this position for two counts.
What is the best exercise for rectus abdominis?
- Ab Crunch Machine. Major Muscle Group: Rectus abdominus. …
- Bent-Knee Hip Raise. Major Muscle Group: Rectus abdominus This is like a reverse crunch but with a longer range of motion. …
- Cable Crunch. Major Muscle Group: Rectus abdominus Kneel below a high pulley. …
- Crunch — Legs on Exercise Ball. …
- Abdominal Ball Crunch.
What is the main action of the rectus abdominis muscle quizlet?
What is the main action of the rectus abdominis muscle? b.
Flexion of the trunk
.
Are obliques love handles?
Love handles
lie on top of the obliques
, which are a very specific group of abdominal muscles. In order to really work those suckers, you have to target them precisely.
What are the two main actions of the external oblique?
Function. The external oblique functions to
pull the chest downwards and compress the abdominal cavity
, which increases the intra-abdominal pressure as in a valsalva maneuver. It also performs ipsilateral (same side) side-bending and contralateral (opposite side) rotation.
What is the action of the internal oblique muscle?
Upon bilateral contraction, the internal abdominal oblique
flexes the trunk
. Simultaneously, it causes compression of the intra-abdominal viscera thereby increasing the intra-abdominal pressure. This action is utilized for functions such as forced expiration, micturition, defecation etc.
