The muscles of the anterolateral abdominal wall are divided into two main groups: Lateral flat muscle group situated on either side of the abdomen, which includes three muscles: external oblique, internal oblique and transversus abdominis .
What muscle forms the abdominal wall?
Muscles of the anterior abdominal wall consists of two vertical muscles located on the midline and bisected by linea alba; Rectus abdominis and pyramidalis and three flat muscles on the anterolateral side arranged from superficial to deep; external abdominal oblique, internal abdominal oblique, transversus abdominis.
What muscles form the anterolateral abdominal wall?
There are two vertical muscles located in the midline of the anterolateral abdominal wall – the rectus abdominis
What are the four groups of muscles that make up the anterolateral abdominal wall?
Muscles of the Abdomen
These muscles of the anterolateral abdominal wall can be divided into four groups: the external obliques, the internal obliques, the transversus abdominis, and the rectus abdominis (Figure 7.23).
What are the muscle layers of the anterior abdominal wall?
There are nine layers to the abdominal wall: skin, subcutaneous tissue, superficial fascia, external oblique muscle , internal oblique muscle, transversus abdominis muscle, transversalis fascia, preperitoneal adipose and areolar tissue, and peritoneum.
Which abdominal muscle causes the most trunk rotation?
- External oblique, side abs that help rotate the trunk.
- Rectus abdominis, flexes the torso and spine.
- Lumbar multifidus, helps stabilize the spine.
- Internal oblique, helps rotate and turn the trunk.
What are the 4 muscles of the abdominal wall?
These muscles of the anterolateral abdominal wall can be divided into four groups: the external obliques, the internal obliques, the transversus abdominis, and the rectus abdominis (Figure and Table).
What is abdominal wall called?
There is a common set of layers covering and forming all the walls: the deepest being the visceral peritoneum , which covers many of the abdominal organs (most of the large and small intestines, for example), and the parietal peritoneum- which covers the visceral peritoneum below it, the extraperitoneal fat, the ...
Is smooth muscle present in abdominal wall?
Smooth muscle is found in the walls of hollow organs , including the stomach, intestines, bladder and uterus; in the walls of passageways, such as blood, and lymph vessels, and in the tracts of the respiratory, urinary, and reproductive systems.
What forms the third layer of abdominal wall muscles?
On the flanks of the body, medial to the rectus femoris, the abdominal wall is composed of three layers. The external oblique muscles form the outermost layer, while the internal oblique muscles form the middle layer, and the transverses abdominus forms the innermost layer.
Which is a role of the anterior abdominal wall muscles?
Collectively the muscles of the anterior abdominal wall, in conjunction with the muscles of the lateral abdominal wall, form a sturdy but flexible boundary for the abdominal cavity which protects the abdominal viscera. They also compress the viscera to maintain and increase intra-abdominal pressure.
How many muscles are in the abdomen?
Abdominal muscle, any of the muscles of the anterolateral walls of the abdominal cavity, composed of three flat muscular sheets, from without inward: external oblique, internal oblique, and transverse abdominis, supplemented in front on each side of the midline by rectus abdominis.
What nerve supplies the abdominal wall?
Major nerves to the anterolateral abdominal wall include the thoracoabdominal, lateral cutaneous, subcostal, iliohypogastric, and ilioinguinal nerves . The thoracoabdominal nerves are derived from T7-T11 and form the inferior intercostal nerves. These nerves run along the internal obliques and the transversalis muscles.
Is the deepest muscle of the abdominal wall?
transversus abdominis – the deepest muscle layer. Its main roles are to stabilise the trunk and maintain internal abdominal pressure. rectus abdominis – slung between the ribs and the pubic bone at the front of the pelvis.
Is there deep fascia in anterior abdominal wall?
Unlike most of the rest of the body the anterior abdominal wall has no deep fascia . The superficial fascia has two layers, a fatty layer (Camper’s fascia) underneath which is a membranous (fibrous) layer (Scarpa’s fascia).
What is the most superficial abdominal muscle?
External Oblique – the most superficial and also the largest flat muscle of the abdominal wall.
