Abdomen

abdominalabdominal musclesbellyabdominalsabdomenshuman abdomenabdominal muscleventerventrumabdomina
The abdomen (colloquially called the belly, tummy or midriff) is the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates.wikipedia
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Midriff

midsectionmidriff exposureBelly
The abdomen (colloquially called the belly, tummy or midriff) is the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates.
In fashion, the midriff is the human abdomen.

Pelvis

pelvicpelvic girdlehip
The abdomen (colloquially called the belly, tummy or midriff) is the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates.
The pelvis (plural pelves or pelvises) is either the lower part of the trunk of the human body between the abdomen and the thighs (sometimes also called pelvic region of the trunk) or the skeleton embedded in it (sometimes also called bony pelvis, or pelvic skeleton).

Thorax

chestthoracicthoraces
The abdomen (colloquially called the belly, tummy or midriff) is the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates.
The thorax or chest is a part of the anatomy of humans and various other animals located between the neck and the abdomen.

Torso

trunkupper bodyDorsal cutaneous branches
The abdomen is the front part of the abdominal segment of the trunk.
The torso includes: the thoracic segment of the trunk, the abdominal segment of the trunk, and the perineum.

Aorta

aorticaortic archaortic root
Structures such as the aorta, inferior vena cava and esophagus pass through the diaphragm. The spleen, and organs of the urinary system including the kidneys, and adrenal glands also lie within the abdomen, along with many blood vessels including the aorta and inferior vena cava.
The aorta is the main and largest artery in the human body, originating from the left ventricle of the heart and extending down to the abdomen, where it splits into two smaller arteries (the common iliac arteries).

Tagma (biology)

tagmatatagmaparts
In arthropods it is the posterior tagma of the body; it follows the thorax or cephalothorax.
Familiar examples are the head, the thorax, and the abdomen of insects.

Liver

hepaticliver protein synthesislivers
Other digestive organs are known as the accessory digestive organs and include the liver, its attached gallbladder, and the pancreas, and these communicate with the rest of the system via various ducts.
In humans, it is located in the right upper quadrant of the abdomen, below the diaphragm.

Cephalothorax

prosomacephalothoracicfovea
In arthropods it is the posterior tagma of the body; it follows the thorax or cephalothorax.
The cephalothorax, also called prosoma in some groups, is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind.

Pancreas

pancreaticexocrine pancreaspancreatic development
Other digestive organs are known as the accessory digestive organs and include the liver, its attached gallbladder, and the pancreas, and these communicate with the rest of the system via various ducts.
The pancreas is an organ that in humans lies in the upper left part of the abdomen.

Peritoneum

peritonealintraperitonealparietal peritoneum
Both the abdominal and pelvic cavities are lined by a serous membrane known as the parietal peritoneum.
This peritoneal lining of the cavity supports many of the abdominal organs and serves as a conduit for their blood vessels, lymphatic vessels, and nerves.

Spleen

splenicsplenetichilum
The spleen, and organs of the urinary system including the kidneys, and adrenal glands also lie within the abdomen, along with many blood vessels including the aorta and inferior vena cava.
In humans the spleen is purple in color and is in the left upper quadrant of the abdomen.

Abdominal external oblique muscle

obliqueexternal obliqueoblique muscle
They are, from the outside to the inside: external oblique, internal oblique, and transverse abdominal.
The abdominal external oblique muscle (also external oblique muscle, or exterior oblique) is the largest and outermost of the three flat abdominal muscles of the lateral anterior abdomen.

Abdominal internal oblique muscle

internal obliqueinternal oblique muscleoblique
They are, from the outside to the inside: external oblique, internal oblique, and transverse abdominal.
The abdominal internal oblique muscle, also internal oblique muscle or interior oblique, is an abdominal muscle in the abdominal wall that lies below the external oblique muscle and just above the transverse abdominal muscle.

Linea alba (abdomen)

linea albaabdomenmidline
All of their fibers merge towards the midline and surround the rectus abdominis in a sheath before joining up on the opposite side at the linea alba.
The white line (linea alba) is a fibrous structure that runs down the midline of the abdomen in humans and other vertebrates.

Human digestive system

digestive systemdigestivedigestive tract
The abdomen in vertebrates contains a number of organs belonging to, for instance, the digestive system, urinary system, and muscular system. The abdominal cavity contains most organs of the digestive system, including the stomach, the small intestine, and the colon with its attached appendix.
It is divided into cervical, thoracic and abdominal parts.

Navel

umbilicusbelly buttonbellybutton
It originates at the pubic bone and is inserted into the linea alba halfway up to the navel.
The navel (clinically known as the umbilicus, colloquially known as the belly button) is a protruding, flat, or hollowed area on the abdomen at the attachment site of the umbilical cord.

Groin

inguinalcrotchinguinal region
In the region of the groin, the inguinal canal, is a passage through the layers.
In human anatomy, the groin (the adjective is inguinal, as in inguinal canal) is the junctional area (also known as the inguinal region) between the abdomen and the thigh on either side of the pubic bone.

Thoracic diaphragm

diaphragmdiaphragmatichemidiaphragm
In humans, the abdomen stretches from the thorax at the thoracic diaphragm to the pelvis at the pelvic brim.
Assisting this function with muscular effort (called forced exhalation) involves the internal intercostal muscles used in conjunction with the abdominal muscles, which act as an antagonist paired with the diaphragm's contraction.

Transverse colon

transversecolon, transverseParts of transverse
The alimentary tract in the abdomen consists of the lower esophagus, the stomach, the duodenum, the jejunum, ileum, the cecum and the appendix, the ascending, transverse and descending colons, the sigmoid colon and the rectum.
It crosses the abdomen from the ascending colon at the hepatic or right colic flexure with a downward convexity to the descending colon where it curves sharply on itself beneath the lower end of the spleen forming the splenic or left colic flexure.

Appendix (anatomy)

appendixvermiform appendixvermiform
The alimentary tract in the abdomen consists of the lower esophagus, the stomach, the duodenum, the jejunum, ileum, the cecum and the appendix, the ascending, transverse and descending colons, the sigmoid colon and the rectum. The abdominal cavity contains most organs of the digestive system, including the stomach, the small intestine, and the colon with its attached appendix.
The appendix is usually located in the lower right quadrant of the abdomen, near the right hip bone.

Inguinal hernia

inguinalscrotal herniahernia, inguinal
This is also where weakness can form, and cause inguinal hernias.
In men, indirect hernias follow the same route as the descending testes, which migrate from the abdomen into the scrotum during the development of the urinary and reproductive organs.

Esophagus

oesophagusesophageallower esophageal sphincter
Structures such as the aorta, inferior vena cava and esophagus pass through the diaphragm. The alimentary tract in the abdomen consists of the lower esophagus, the stomach, the duodenum, the jejunum, ileum, the cecum and the appendix, the ascending, transverse and descending colons, the sigmoid colon and the rectum.
These blood vessels develop as part of a collateral circulation that occurs to drain blood from the abdomen as a result of portal hypertension, usually as a result of liver diseases such as cirrhosis.

Urinary bladder

bladderfundusintravesical
The urinary bladder, uterus, fallopian tubes, and ovaries may be seen as either abdominal organs or as pelvic organs.
In infants and young children the urinary bladder is in the abdomen even when empty.

Pelvic brim

brim of the pelvis
In humans, the abdomen stretches from the thorax at the thoracic diaphragm to the pelvis at the pelvic brim.
The false pelvis, which is above that plane, is sometimes considered to be a part of the abdominal cavity, rather than a part of the pelvic cavity (see also Abdomen).

Descending colon

descendingcolon, descendingdescending iliac
The alimentary tract in the abdomen consists of the lower esophagus, the stomach, the duodenum, the jejunum, ileum, the cecum and the appendix, the ascending, transverse and descending colons, the sigmoid colon and the rectum.
The descending colon begins at the splenic flexure at the upper left part of the abdomen.