This action occurs when the muscles of the abdominal wall contract at the same time. The increase in abdominal pressure aids in several activities that include, expiration,coughing,regurgitation,micturition,defecation, parturition.
Internal inguinal ring
This feature is an opening into the inguinal canal on the deep side of the inguinal ligament. It is positioned lateral and superior to the external inguinal ring. which makes the structure stronger than if they were lined up opposite each side.
There are two transverse planes commonly used to divide the abdomen into nine regions for study purposes. This is the name for the inferior of these two planes. It is at the level of lumbar 5 vertebral body.It may also be called the transtubercular plane.
These abdominal areas are defined for study purposes. Two transverse planes and two parasagittal planes are used to define these areas. The superior transverse plane is called the subcoastal plane and it is at the level of the body of L3 vertebra.The inferior plane is the intertubercular (transtubercular) plane and it is at the level of L 5 body. The two parasagittal planes are midclavicular. These divide the abdomen into 9 areas.
This feature runs along the midline on the anterior side of the abdomen from the Xiphoid process to the public symphysis. It is where the aponeuroses of the three abdominal muscles from one side insert on the other side. The umbilicus is part of this structure.
Lumbar regions l and r
If one were to divide the abdomen into 9 segments , these segments would be inferior to the subcostal plane and superior to the intertubercular plane. They are lateral, both left and right, to the umbilical region. They are sometimes called the flank.
Lumbar vertebra 1 body
This structure is important because the transpyloric line runs through it. This is the plane at the inferior border of the abdominal volume that is mostly protected by the ribs.
Lumbar vertebra 3 body
This structure is important because the subcostal plane runs through it . This is one of the planes used to divide the abdomen into nine regions.
Lumbar vertebra 5 body
This structure is important because the intertubercular plane runs through it. This is one of the planes used to divide the abdomen into nine regions.
This is the name for the inferior edge of the rib cage . It includes the costal cartilages of ribs 7,8, 9 and 10. At the midaxillary line it is at the level of rib 10.
Mc Burney's point
This is the landmark about 2 inches along the line connecting the anterior superior iliac spine (ASIS) and the umbilicus, starting at the ASIS. This is roughly one third of the length of that line. Deep to this is normally where one would find the appendix. Extreme tenderness at this landmark is usually and indication of Appendicitis.
Psoas major M
This muscle is of particular importance because it merges with the iliacus to form the iliopsoas which is the prime flexor of the thigh. It is known as the tenderloin behind the meat counter markets.
If one were to divide the abdomen into 9 segments, this segment would be the superior middle region of the abdomen, having the left and right hypochondriac regions lateral to it.
Psoas Minor M
This muscle is the most ventral of the three posterior abdominal wall muscles. It is missing in about 40 % of the population.
This structure is of significance because it is the place where the inferior end of the inguinal ligament attaches. it is the origin for the adductor longus.
External abdominal obligue M
This is the superificial layer of abdominal muscle at the midaxillary line.Its fibers are oblique, directed inferiorly as they approach the anterior midline.It is continous with the external intercostal muscle.
Quadratus lumborum M
This muscle is the most dorsal of the three posterior abdominal wall muscles. It can be seen in two places in the cat . It can be seen in the Thoracic cavity running along the vertebral border and it can be found dorsal to the psoas major in the abdomen.It is relatively smalll in humans.
External inguinal ring
This feature is a opening through the aponeuroses of the inguinal ligament, It is positioned medial and inferior to the internal inguinal ring, which makes the structure stronger than if they were lined up opposite each other
The landmark of the Ilium that serves as the superior attachment of the inguinal ligament is the
ASIS Anterior superior iliac spine
The location on the right side between the ASIS and the umbilicus that is superficial to where one would expect to find the appendix is known as
The deepest of the four 4 muscles that make up the anterior abdominal wall is the
Transverse abdominal muscle
Connective tissue along the midanterior line of the abdomen is called the
Linea alba- It is where the aponeuroses of the abdominal muscles insert on each other.
The muscle whose apponeuroses delaminates and encloses the rectus abdominis muscle is the
Internal abdominal oblique
The muscle of the anterior abdominal wall that runs from the pubic crest and symphysis to the xiphoid process and costal cartilage of ribs 5 to 7 is the
Rectus abdominis muscle