What is musculus rectus abdominis?
Rectus abdominis muscle (Musculus rectus abdominis) Rectus abdominis, informally known as the abs muscle, is a long muscle of the anterior abdominal wall. In those with low body fat, it is clearly visible beneath the skin forming the ‘six pack’. It extends from the rib cage all the way to the pubic bone.
What movement does the transversus abdominis perform?
The transverse abdominus contracts and steadies the spine by providing “squeezing support for the back. Much like you could squeeze one end of a tube of toothpaste and see the other end of the tube straighten out, the transverse abdominus squeezes the spine and abdomen and “pushes up” the trunk.
What joints does the rectus abdominis cross?
JOINT CROSSED: hip and knee.
What Innervates the transverse abdominis?
It is innervated by the terminal branches of intercostal nerves T7-T12, the subcostal nerve (T12), the iliohypogastric nerve (L1) and ilioinguinal nerves (L1). These nerves arise from the ventral rami of the spinal nerves of T7-L1, and this is the simplified description of innervation described in anatomy textbooks.
What does contraction of the transversus abdominis produce?
The most pertinent of these is the transversus abdominis muscle. Rather, the alignment of its muscle fibers means that when it contracts it pulls tension on the pelvic bones, squeezing in around the lumbar spine and pelvis much like a corset would.
How do you stretch your rectus abdominis?
Get on your hands and knees, and tuck your head downward as you arch your back, similar to how a cat does it. Extend the neck all the way upwards, and drop your belly all the way downwards, stretching the abdominal muscles. Hold for 20 seconds, then return to the starting position. Repeat 3 to 4 times.
What is the origin and insertion of the transverse abdominis muscle?
The origin (or unmoving point) of the TA muscles is on the costal margin, iliac crest, and inguinal ligament. The insertion (or moveable piece) of the TA muscles is located on the xiphoid process, symphysis pubis, and linea alba.
Where are the rectus abdominis?
A rectus abdominis muscle runs longitudinally along the ventral aspect of the body wall between the pectoral and pelvic girdles, and laterally this muscle is associated with the third group, the lateral hypaxial muscles.
Is the rectus abdominis superficial or deep?
The rectus abdominis compresses the abdominal viscera, prevents herniation, and stabilizes the pelvis during ambulation. Pyramidalis – vertical muscle shaped like a triangle. It is located superficial to the rectus abdominis and located at the base of the pubic bone. The apex of the triangle attaches to the linea alba.