Anterior abdominal wall muscles
The anterior muscle group includes the
rectus abdominis and pyramidalis muscles
. These are almost completely enveloped by the thick rectus sheath formed by the aponeuroses of the lateral abdominal muscles.
What are the functions of anterior abdominal wall?
- Providing a durable and flexible covering to prevent the abdominal viscera from leaving the abdominal cavity.
- Protecting internal abdominal organs from trauma/injury.
- Maintaining the anatomical position of the abdominal organs.
What is the anterior abdominal wall?
The anterior abdominal wall forms
the anterior limit of the abdominal viscera
and is defined superiorly by the xiphoid process of the sternum and costal cartilages and inferiorly by the iliac crest and pubic bones of the pelvis.
What does the abdominal wall consist of?
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. Nerves, blood vessels, and lymphatics are present throughout.
What are the anterior muscles of the abdomen?
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 is an abdominal wall hernia?
An abdominal wall hernia is
a weakness in the muscles of the abdominal wall
. When a hernia occurs, it can cause pain, and sometimes fat or intestines from the abdominal wall can bulge out. The abdominal wall is made up of muscle and tissues that attach those muscles to each other and to bone.
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 …
What do the anterior abdominal muscles do?
The muscles of the anterior abdominal wall are largely involved in
protecting the contents of the abdominal cavity
, but also function to move the trunk and assist in other bodily functions.
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).
Which muscle is closest to the anterior skin of the abdomen?
Rectus abdominis
is a long strap muscle that extends the entire length of the anterior abdominal wall lies close to the midline, it is an important postural and core muscle. With a fixed pelvis, contraction results in flexion of the lumbar spine. When the ribcage is fixed contraction results in a posterior pelvic tilt.
What are the boundaries of the anterior abdominal wall?
- Cranial: xiphoid process and the. costal margins.
- Caudal. : pubic and iliac bones.
- Lateral: midaxillary line.
What is the innermost layer of the abdominal wall?
The wall of the stomach is made up of the
mucosa
(innermost layer), submucosa, muscle layer, subserosa, and serosa (outermost layer).
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 is the deepest anterior abdominal muscle?
The transversus abdominis muscles
are the deepest of the ab muscles, and their job is to tense the abdominal wall, compress abdominal viscera (the internal organs of the abdomen), and stabilize the pelvis and lumbar spine. One transversus abdominis muscle wraps around each side of the abdomen.
What muscles are in your abdomen?
- transversus abdominis – the deepest muscle layer. …
- rectus abdominis – slung between the ribs and the pubic bone at the front of the pelvis. …
- external oblique muscles – these are on each side of the rectus abdominis.
What do you know about anterior and posterior abdominal wall of abdomen?
The anterior layer attaches to the anterior aspect of the transverse processes of the lumbar vertebrae, the 12th rib and the iliac crest. Laterally the fascia is continuous with the aponeurotic origin of the transversus abdominis muscle.
