| 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 |
What is the origin and insertion of the abdominals?
The muscles of the anterior abdominal wall are located near the midline between the costal margin superiorly and the pubis inferiorly....Origin and insertion.OriginPubic crest, Pubic symphysisInsertionLinea albaInnervationSubcostal nerve (T12)Blood supplyInferior epigastric vesselsFunctionTenses linea alba
Where is the rectus abdominis muscle?
abdomenRectus abdominis: This pair of muscles goes down the middle of your abdomen from your ribs to the front of your pelvis. The muscles hold your internal organs in place and keep your body stable during movement. The rectus abdominis may form bumps sometimes called a “six-pack” when someone has a trim, fit abdomen.
What is the origin and insertion of the transverse abdominis?
The transversus abdominis originates from the costal margin, thoracolumbar fascia, iliac crest, and inguinal ligament. This muscle then inserts onto the linea alba, pubic symphysis, and xiphoid process.
What is the insertion of rectus abdominis?
Rectus abdominis muscleOriginPubic symphysis, pubic crestInsertionXiphoid process, costal cartilages of ribs 5-7InnervationIntercostal nerves (T7-T11), subcostal nerve (T12)Blood supplyInferior epigastric and superior epigastric arteries; contributions from posterior intercostal, subcostal and deep circumflex arteries1 more row
What is the origin and insertion of the internal oblique muscle?
From these points of origin, the internal oblique runs diagonally up the side of the body and inserts onto the costal cartilage of the eighth through twelfth ribs and the linea alba.
Where is the origin of the transversus abdominis muscle?
Origin and insertion The transversus abdominis has several origin points: Lateral one-third of the superior surface of the inguinal ligament and the associated iliac fascia. Anterior two-thirds of the inner lip of iliac crest. Thoracolumbar fascia between the iliac crest and the 12th rib.
Which is the origin of the transversus abdominis muscle quizlet?
Origin: thoracolumbar fascia; inguinal ligament; costal cartilages of inferior six ribs; iliac crest. Insertion: linea alba; pubic crest. Action: increases the intraabdominal pressure during forced expiration. Innervation: thoraco-abdominal nerves (anterior rami of T7-T11), subcostal nerve, and first lumbar nerve.
What is the origin of the internal oblique?
Abdominal internal oblique muscleOriginInguinal ligament, Iliac crest and the Lumbodorsal fascia.InsertionLinea alba, Pectineal Line of Pubis (via Conjoint tendon) and ribs 10-12.ArterySubcostal arteries.NerveThoracoabdominal nn. (T7-T11), Subcostal n. (T12), Iliohypogastric n. (L1) and Ilioinguinal n. (L1)10 more rows
Why is the rectus abdominis activated during crunches?
The muscle is activated while doing crunches because it pulls the ribs and the pelvis in and curves the back. The muscles are also used when a child is delivered, during bowel movements, and coughing. Breathing in and holding the rectus abdominis in pulls in the abdomen.
Which muscles are located in the lateral abdominal wall?
The three muscles of the lateral abdominal wall — the internal oblique, the external oblique, and the transverse abdominis — have fibrous connections that create the rectus sheath, which crosses over and under the rectus abdominis.
What muscle is used to build a six pack?
When this muscle is exercised and layers of fat disappear from the abdomen, the exposed rectus abdominis muscle creates the look of a “six pack.”. Strengthening the muscle also improves performance in sports that require jumping.
What muscle is used to scan the liver?
When doctors perform ultrasound-guided techniques on patients (such as a liver biopsy), they sometimes start scanning at the rectus abdominis muscle to distinguish between the internal oblique, transverses abdominis, and the peritoneal cavity. Last medically reviewed on January 20, 2018.
What is the rectus abdominis?
The rectus abdominis is a very 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. Tendinous intersections (intersectiones tendineae) further subdivide each rectus abdominis muscle into a series of smaller muscle bellies.
What causes the rectus abdominis to expand?
Tensing of the rectus abdominis causes the muscle to expand between each tendinous intersection. 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.
What is the difference between a human and an animal's abdominal musculature?
The most obvious difference between animal and human abdominal musculature is that in animals, there are a different number of tendinous intersections.
What muscle is responsible for flexing the lumbar spine?
The rectus abdominis is an important postural muscle. It is responsible for flexing the lumbar spine, as when doing a crunch. 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.
What is the sternalis muscle?
The sternalis muscle may be a variant form of the pectoralis major or the rectus abdominis. Some fibers are occasionally connected with the costoxiphoid ligaments, and the side of the xiphoid process .
What is pulled abdominal muscle?
An abdominal muscle strain, also called a pulled abdominal muscle, is an injury to one of the muscles of the abdominal wall. A muscle strain occurs when the muscle is stretched too far. When this occurs the muscle fibers are torn.
Where is the proximal attachment of the rectus abdominis muscle located?
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.
What is rectus abdominal muscle?
The rectus abdominis muscle also called the “abdominal muscle” or sometimes the “abs muscles”, is a paired straight muscle located at the front side of the abdominal area. The Rectus abdominis muscle is two parallel muscles, which are separated by the linea alba (midline band of connective tissue).
Rectus Abdominis muscle exercise
Following are the few best exercise you can do to strengthen your Rectus Abdominis muscles.
Overview
Structure
Function
Clinical significance
- The three muscles of the lateral abdominal wall the internal oblique, the external oblique, and the transverse abdominis have fibrous connections that create the rectus sheath, which crosses over and under the rectus abdominis. When doctors perform ultrasound-guided techniques on patients (such as a liver biopsy), they sometimes start scanning at...
Other animals
The rectus abdominis muscle, (Latin: straight abdominal) also known as the "abdominal muscle" or simply the "abs", is a paired straight muscle. 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. …
Additional images
The rectus abdominis is a very 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. Tendinous intersections (intersectiones tendineae) further subdivide each rectus abdominis muscle into a series of smaller muscle bellies. Tensing of the rectus abdominis causes the muscle to expand between each tendinous intersection.
See also
The rectus abdominis is an important postural muscle. It is responsible for flexing the lumbar spine, as when doing a crunch. 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.
External links
An abdominal muscle strain, also called a pulled abdominal muscle, is an injury to one of the muscles of the abdominal wall. A muscle strain occurs when the muscle is stretched too far. When this occurs the muscle fibers are torn. Most commonly, a strain causes microscopic tears within the muscle, but occasionally, in severe injuries, the muscle can rupture from its attachment.
A rectus sheath hematoma is an accumulation of blood in the sheath of the rectus abdominis mu…