Where is the posterior abdominal wall located?
Extends from the 12th rib to the iliac crest. Laterally goes to the internal oblique. The external abdominal oblique muscle fibers extend from lower thoracic ribs to the linea alba and the iliac crest.
What is the posterior sheath?
The rectus sheath is made up of two parts, known as the posterior sheath and the anterior sheath. These sheaths are made of fibers of the transversus abdominis, internal abdominal oblique (IAO), and external abdominal oblique (EAO), which are muscles of the abdomen.
What is the posterior boundary of the abdominal cavity?
The abdominal wall surrounds the abdominal cavity, providing it with flexible coverage and protecting the internal organs from damage. It is bounded superiorly by the xiphoid process and costal margins, posteriorly by the vertebral column and inferiorly by the pelvic bones and inguinal ligament.
What muscles are in the posterior abdominal wall?
The posterior abdominal wall primarily serves as protection for the retroperitoneal organs. It is mostly muscular contributed by the diaphragm, paraspinal, quadratus lumborum, iliacus, and psoas muscles.
What is abdominal sheath?
The rectus sheath is the durable, resilient, fibrous compartment that contains both the rectus abdominis muscle and the pyramidalis muscle. The fascial coverings of the external oblique, internal oblique, and transversus abdominis muscles comprise the rectus sheath.
Where is the posterior rectus sheath?
Gross anatomy The rectus sheath is composed of the aponeuroses of transversus abdominis, external oblique and internal oblique muscles, which form anterior and posterior layers of the sheath that fuse laterally at the linea semilunaris and in the midline at the linea alba.
What is 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 stabilizes the posterior abdominal wall?
The posterior abdominal wall is formed by the lumbar vertebrae, parts of the ilia of the hip bones, psoas major and iliacus muscles, and quadratus lumborum muscle. This part of the core plays a key role in stabilizing the rest of the body and maintaining posture.
What makes up the posterior rectus sheath?
What is the function of rectus sheath?
The function of the rectus sheath is to protect the muscles and vessels which it encloses. In addition, keeping the rectus abdominis and pyramidalis muscle together helps in providing maximal compression of and support to abdominal viscera.
What Innervates the posterior abdominal wall?
The somatic nerves of the posterior abdominal wall are the ventral rami of the subcostal and lumbar spinal nerves. These nerves for the most part course between the internal oblique and transverse abdominis muscles (Figure 11-1). Subcostal nerve (T12).
Which fascia is located on the posterior abdominal wall?
Analogously to the anterolateral abdominal wall, the fascia of the posterior abdominal wall lies immediately below the skin and subcutaneous tissue. The thoracolumbar fascia is a large, roughly diamond-shaped area of connective tissue formed by the thoracic and lumbar parts of the deep fascia.
What is the largest muscle in your body?
gluteus maximus
The largest muscle in the body is the gluteus maximus. Located at the back of the hip, it is also known as the buttocks. It is one of the three gluteal muscles: medius.
What are 4 pack abs?
A person with a four-pack has two bands. Many people’s rectus abdominis has three intersections. This means that if most people worked at it, they could achieve a six-pack. But just because you have more or less doesn’t mean you’re stronger or weaker.