The rectus sheath is composed of the aponeuroses of transversus abdominis
What makes the rectus sheath?
The rectus sheath, also called the rectus fascia, is formed by the aponeuroses of the transverse abdominal and the internal and external oblique muscles. It contains the rectus abdominis and pyramidalis muscles.
Is rectus sheath connective tissue?
The rectus sheath is a multilayered aponeurosis, a fibrous sheath of dense regular connective tissue.
What is the anterior layer of rectus sheath?
The anterior layer is derived from the external oblique aponeurosis and the anterior lamina of the internal oblique aponeurosis. The posterior layer is made up of the posterior lamina of the internal oblique aponeurosis and the transversus abdominis aponeurosis.What forms anterior rectus sheath below Arcuate?
Below the arcuate line, there is a transition so that all but the transversalis fascia pass anterior to rectus abdominis. The arcuate line can be seen from the peritoneal surface of the rectus sheath as a superiorly convex line. It is roughly positioned half way between the umbilicus and the pubic crest.
What is rectus anatomy?
Definition of rectus : any of several straight muscles (as of the abdomen)
What is the posterior rectus sheath made up of above the arcuate line?
The posterior layer is made up of the posterior lamina of the internal oblique aponeurosis and the transversus abdominis aponeurosis. Inferior to the arcuate line, all three muscle aponeuroses make up the rectus sheath, that is now only anterior to the rectus abdominis and not posterior to it at all.
What does the arcuate line mark?
The arcuate line marks the border between the body (corpus) and the wing (ala) of the ilium, and, running inferior, anterior, and medial from the auricular surface to the area corresponding to the acetabulum, it also indicates where weight is transferred from the sacroiliac joint to the hip joint.Where is the arcuate line?
The arcuate line or semicircular line of Douglas is located at roughly one-third of the distance from the pubic crest to the umbilicus.
What are Tendinous intersections?The tendinous intersections define the anatomy of the rectus abdominis and assist with physiological movement. … The forward flexion provided by tendinous intersections makes daily activities like stretching or bending over to pick up an object possible.
Article first time published onWhat is a muscle sheath?
a fibrous membrane, usually quite thin and devoid of fat, surrounding a single muscle, separating it from adjacent muscles and allowing movements between them; related to contraction. Synonym(s): fascia propria musculi [TA], muscle sheath.
Is the rectus abdominis anterior or posterior?
Structure. The rectus abdominis muscle is paired muscle that runs vertically, either side of the linea alba, on the anterior surface of the abdominal wall. The linea alba is a band of connective tissue that divides the two halves of the muscle vertically.
Where is rectus sheath deficient?
The inferior quarter of the posterior wall of the rectus sheath is deficient; the arcuate line forms the inferior border of the posterior wall of the rectus sheath. The arcuate line is midway between the umbilicus and the pubic crest.
What is above and below arcuate line?
Above the arcuate line. Anterior layer: composed of the external oblique aponeurosis and the anterior lamina of the internal oblique aponeurosis. Posterior layer: composed of the transversus abdominis aponeurosis and the posterior lamina of the internal oblique aponeurosis.
What is a rectus sheath catheter?
Introduction. Rectus sheath catheters (RSCs) are increasingly being used to provide postoperative analgesia following laparotomy for colorectal surgery. Little is known about their efficacy in comparison with epidural infusion analgesia (EIA).
What is a rectus sheath Haematoma?
Rectus Sheath Haematoma is an accumulation of blood in the anterior Rectus abdominis muscle. Primary causation is due to either epigastric vessel rupture or muscle body tear.
What level is arcuate line?
The arcuate line was found to lie at 74.6% of the distance from the pubic symphysis to the umbilicus, and 32.7% of the distance from the pubic symphysis to the xiphoid. This location was 1.8 +/- 1.7 cm superior to the level of the anterior superior iliac spines (ASIS).
Which of the following muscle Aponeuroses contribute to the posterior rectus sheath above the arcuate line?
Transversus abdominis muscle Above the arcuate line, the transversus abdominis aponeurosis contributes to the posterior rectus sheath.
Which two arteries meet within the rectus sheath?
Superior Epigastric Arteries Descends within the rectus sheath (posterior to the rectus muscle but anterior to the posterior rectus sheath) to form an anastomosis with the inferior epigastric artery.
What does abdominis mean?
The term abdominis is an old Latin term for abdomen. In modern times, it is still used in anatomical classification of muscles in the human abdomen, such as: Rectus abdominis muscle. Transverse abdominal muscle.
When the term rectus appears in the name of a muscle it indicates that?
When the term rectus appears in the name of a muscle, it indicates that. the muscle fascicles run parallel to the midline of the body.
What is the fascia Transversalis?
The transversalis fascia is a thin layer of connective tissue lining most of the abdominal cavity between the posterior surface of the transversus abdominis and superficial to the extraperitoneal fat and peritoneum.
Where does the inferior epigastric artery enter the rectus sheath?
Below the arcuate line, the inferior epigastric vessels pierce the transversalis fascia on each side of the rectus sheath and enter the rectus abdominis muscle. The artery then runs within the rectus sheath, between the transversalis fascia and the posterior wall of the rectus abdominis.
What is Hesselbach's triangle?
The Hesselbach triangle, also called the inguinal triangle, is a region of the lower, anterior abdominal wall, or groin, that was first described by Frank Hesselbach, a German surgeon and anatomist, in 1806. It describes a potential area of weakness in the abdominal wall, through which a hernia can protrude.
What is the linea semilunaris made of?
Structure. The linea semilunaris corresponds with the lateral border of the rectus abdominis muscle. It extends from the cartilage of the ninth rib to the pubic tubercle. It is formed by the aponeurosis of the internal oblique at its line of division to enclose the rectus.
What structures form the linea alba?
It’s because the linea alba is formed by the interlacing aponeuroses of three vertical abdominal muscles: external oblique, internal oblique and transversus abdominis muscles.
What is the Semilunaris?
The linea semilunaris is a vertical, curved structure that runs along the lateral edges of the rectus abdominis muscle in the anterior abdominal wall. It is the site of union where tendons of the lateral abdominal muscles meet the sheath surrounding the rectus abdominis muscle, also known as the rectus sheath.
Why does the rectus abdominis have Tendinous inscriptions?
The tendinous inscriptions limit fluid collection beneath the anterior rectus sheath, prevent muscle rupture, and aid in the biomechanics of the RA [1-2].
What are Tendinous intersections quizlet?
tendinous intersections. The rectus abdominis has small connective tissue bands called tendinous intersections, located horizontally across the muscle dividing it into small segments, and the muscle is enclosed by the rectus sheath.
What is the tendinous insertion?
Basic Anatomy of a Tendon Each muscle has two tendons, one proximally and one distally. … The proximal attachment of the tendon is also known as the origin and the distal tendon is called the insertion.
What is fascia made of?
Fasciae are similar to ligaments and tendons as they are all made of collagen except that ligaments join one bone to another bone, tendons join muscle to bone and fasciae surround muscles or other structures. The video below gives a fascinating introduction to fascia.
