Abdomen Muscles Of The Abdominal Wall Abdominal Organs

The obliquus externus (external oblique) muscle is the outer most muscle covering the side of the abdomen. It is broad, flat, and irregularly quadrilateral. It originates on the lower eight ribs, and then curves down and forward towards its insertion on the outer anterior crest of the ilium and (via the sheath of the rectus abdominus muscle) the midline linea alba. The obliquus internus (internal oblique) muscle is triangularly shaped and is smaller and thinner than the external oblique muscle that overlies it. It originates from Poupart's ligament / inguinal ligament and the inner anterior crest of the ilium. The lower two-thirds of it insert, in common with fibers of the external oblique and the underlying transversus abdominus, into the linea alba. The upper third inserts into the lower six ribs. The transversus abdominus muscle is flat and triangular, with its fibers running horizontally. It lies between the internal oblique and the underlying transversalis fascia. It originates from Poupart's ligament, the inner lip of the ilium, the lumbar fascia and the inner surface of the cartilages of the six lower ribs. It inserts into the linea alba behind the rectus abdominis .

The rectus abdominis muscles are long and flat. They originate at the pubic bone , run up the abdomen on either side of the linea alba, and insert into the cartilages of the fifth, sixth, and seventh ribs. The muscle is crossed by three tendinous intersections called the linae transversae . The rectus abdominus is enclosed in a thick sheath formed, as described above, by fibers from each of the three muscles of the lateral abdominal wall.

The pyramidalis muscle is small and triangular. It is located in the lower abdomen in front of the rectus abdominis. It originates at the pubic bone and is inserted into the linea alba half way up to the umbilicusFor the plant of this name, see Umbilicus rupestris. The umbilicus also called the navel is essentially a scar representing the former attachment of the umbilical cord in the fetus. Colloquial terms for navel are belly button and tummy button. It can form.

2 Abdominal Organs

The abdomen contains the liverThe liver is an organ in vertebrates including humans. It plays a major role in metabolism and has a number of functions in the body including detoxification, glycogen storage and plasma protein synthesis. It also produces bile which is important for dige with its attached gallbladderThe gallbladder (or cholecyst is a pear-shaped organ that stores bile (or "gall") until the body needs it for digestion. It is connected to the liver and the duodenum by the biliary tract. Anatomy Not all mammals have gallbladders. The rat and horse, for and the small intestineIn biology the small intestine is the part of the gastrointestinal tract between the stomach and the large intestine. In humans over 5 years old it is about 7m long. It is divided into three structural parts: duodenum, jejunum and ileum . Food from the st with its attached appendix, plus the stomachIn anatomy, the stomach is an organ in the alimentary canal used to digest food. Generally, the stomach's primary function is not the adsorption of nutrients from digested food; this task is usually performed by the intestine. Latin names for the stomach, pancreasThe pancreas is a retroperitoneal organ that serves two functions: exocrine it produces pancreatic juice containing digestive enzymes endocrine it produces several important hormones Anatomy The pancreas is a retroperitoneal organ located posterior to the, spleenThe spleen is a ductless, vertebrate gland that is not necessary for life but is closely associated with the circulatory system, where it functions in the destruction of old red blood cells and removal of other debris from the bloodstream, and also in hol, colon, and urinary bladder. The kidneys, pancreas, and major blood vessels such as the aorta and inferior vena cava are also considered part of the abdomen, but are located in the part of the abdomen known as the retroperitoneum.

3 Surface Landmarks of the Abdomen

In the mid-line a slight furrow extends from the ensiform cartilage/ xiphoid process above to the symphysis pubis below, representing the linea alba in the abdominal wall. At about its midpoint sits the umbilicus or navel. On each side of it the broad recti muscles stand out in muscular people. The outline of these muscles is interrupted by three or more transverse depressions indicating the lineae transversae. There is usually one about the ensiform cartilage, one at the umbilicus, and one between. It is the combination of the linea alba and the linea transversae which form the abdominal "six-pack" sought by body builders.

The upper lateral limit of the abdomen is the subcostal margin formed by the cartilages of the false ribs (8, 9, 10) joining one another. The lower lateral limit is the anterior crest of the ilium and Poupart's ligament, which runs from the anterior superior spine of the ilium to the spine of the pubis. These lower limits are marked by visible grooves. Just above the pubic spines on either side are the external abdominal rings, which are openings in the muscular wall of the abdomen through which the spermatic cord emerges in the male, and through which an inguinal hernia may rupture.

One method by which the location of the abdominal contents can be appreciated is to draw three horizontal and two vertical lines. The highest of the former is the transpyloric line of C. Addison, which is situated half-way between the suprasternal notch and the top of the symphysis pubis, and often cuts the pyloric opening of the stomach an inch to the right of the mid-line. The hilum of each kidney is a little below it, while its left end approximately touches the lower limit of the spleen. It corresponds to the first lumbar vertebra behind. The second line is the subcostal, drawn from the lowest point of the subcostal arch (tenth rib). It corresponds to the upper part of the third lumbar vertebra, and it is an inch or so above the umbilicus. It indicates roughly the transverse colon, the lower ends of the kidneys, and the upper limit of the transverse (3rd) part of the duodenum. The third line is called the intertubercular, and runs across between the two rough tubercles, which can be felt on the outer lip of the crest of the ilium about two and a half inches (60 mm) from the anterior superior spine. This line corresponds to the body of the fifth lumbar vertebra, and passes through or just above the ileo-caecal valve, where the small intestine joins the large. The two vertical or mid-Poupart lines are drawn from the point midway between the anterior superior spine and the pubic symphysis on each side, vertically upward to the costal margin. The right one is the most valuable, as the ileo-caecal valve is situated where it cuts the intertubercular line. The orifice of the vermiform appendix lies an inch lower, at McBurney's point. In its upper part, the vertical line meets the transpyloric line at the lower margin of the ribs, usually the ninth, and here the gallbladder is situated. The left mid-Poupart line corresponds in its upper three-quarters to the inner edge of the descending colon. The right subcostal margin corresponds to the lower limit of the liver, while the right nipple is about half an inch above the upper limit of this viscus.

4 Related topics

5 References

Tortora, Gerard J., Anagnostakos, Nicholas P. (1984) Principles of Anatomy and Physiology, Harper & Row Publishers, New York BooksEnthsiast.com
Gray, Henry, (1977) Anatomy, Descriptive and Surgical (Gray's Anatomy) Bounty Books
Taber, Clarence Wilber, (1981) Taber's Cyclopedic medical dictionary 14 Edition, F.A Davis Company, Philadelphia BooksEnthsiast.com

Anatomy

<Hide>

Home > Abdomen

1 Muscles of the Abdominal Wall