Colon

Synonyms in a broader sense

Colon, interstitium grassum, colon, rectum, rectum (rectum), appendix (caecum), appendix (Appenedix vermiformis)

English: colon

definition

As the last section of the digestive tract, the large intestine connects to the small intestine and, with its 1.5 meters length, frames the small intestine on almost all sides. The main task of the large intestine is to remove (absorb) the fluid and the various minerals (electrolytes) in food from the intestinal contents and thus to thicken the stool. The large intestine is populated with bacteria (microflora) that perform important functions for the large intestine and thus for the organism.

Further information on the anatomy of the abdominal cavity can be found here: Abdominal cavity

Figure large intestine

1. Colon, ascending part -
   Ascending colon
2. Appendix - Caecum
3. Appendix -
   Appendix vermiformis
4. Right colon bend -
   Flexura coli dextra
5. Large intestine, transverse part -
   Transverse colon
6. Left Colon Bend -
   Flexura coli sinistra
7. Colon, descending part -
   Descending colon
8. Large intestine, s-shaped part -
   Sigmoid colon
9. Rectum - Rectum
10. Bulges of the
    Colon Wall -
    Haustra coli
11. Liver - Hepar
12. Stomach - Guest
13. Spleen - Sink
14. Gallbladder -
    Vesica biliaris
15. Small intestine -
    Intestine tenue
16. Esophagus -
    Esophagus

You can find an overview of all Dr-Gumpert images at: medical illustrations

Structure and length of the large intestine

The colon starts behind the Bauhinschen flap (Ileocecal valve), which shields the small intestine from the colon colonized by bacteria. Behind it lies the appendix (Cecum, Caecum), which, as the name suggests, ends blindly in the abdomen. The appendix is ​​about 7 cm long and has an appendage, which because of its appearance Appendix vermiformis is called. The appendix is ​​on average 9 cm long, but its length is subject to strong individual fluctuations. The position of the appendix is ​​very variable, which is why appendectal pain does not always appear immediately.
The length of the entire colon also varies.

example

Not infrequently, however, the pain is projected in the so-called ´Appendicitis` (appendicitis) to a point on the lower right abdominal wall, den McBurney Point. This point lies between the right anterior upper iliac spine (anterior superior iliac spine) and the navel.

The length of the colon varies from person to person. For example, age, gender, genetic predisposition and body size all play a role. Roughly, however, it can be said that a normal human colon is between 1.20 and 1.50 meters is long.
The individual sections also differ in their length: in the right half of the abdomen, it is around 20-25cm long Ascending colon (ascending colon). At the height between the 12th thoracic vertebrae and the 2nd lumbar vertebrae, the approximately 40cm long runs horizontally to the left side Transverse colon (horizontal colon). It closes with 20-25cm that Descending colon (descending colon), which is in the Sigmoid colon (S-shaped large intestine) with a length of about 40 cm. The large intestine forms a frame around the much longer one Small intestine (approximately 3.75m). Furthermore, both the small ones count appendix with the appendix, as well as that about 15-20 cm long rectum to the colon.

Layer structure and structures of the colon wall

There are certain structures that characterize the large intestine. The macroscopically visible, colon-specific Taenien, are three longitudinal strips approx. 1 cm wide, on which the longitudinal muscles are somewhat compressed. The so-called House doors are also typical of the macroscopic appearance of the large intestine. They are caused by periodic contractions of the circular muscles, so that constrictions can be separated from bulges at intervals of a few centimeters. They are also typical of the large intestine (colon) Fat appendages (Appendices epiploicae) hanging from the taenias. For surface enlargement, there are closely spaced 0.5 cm deep in the large intestine Crypts (Glandulae inetstinales). For this, the villi, which are typical for the small intestine and which are required for the absorption of food, are no longer needed in the large intestine. Also, the colon is characterized by many Goblet cells and especially long Microvillithat represent the microrelief of the mucous membrane.

The wall structure of the mucous membrane of the large intestine largely corresponds to that of the other sections of the digestive tract.

• From the inside, the wall of the large intestine is lined with mucous membrane (Tunica mucosa), which are divided into three sub-layers. The top layer is a cover fabric (Lamina epithelialis mucosae, epithelium). In the covering tissue of the large intestine, a particularly large number of cells are stored that are filled with mucus, which they periodically release into the interior of the intestine, thus ensuring that the intestinal contents can slide. This is called Goblet cells. The next sub-layer is a shifting layer (Lamina propria mucosae), which contains a particularly large number of lymphocytes and lymph follicles for the immune function of the intestine. Then there is a very narrow layer of self-muscle (Lamina muscularis mucosae), which can change the relief of the mucous membrane.
• Another loose shifting layer follows (Tela submucosa), which consists of connective tissue and in which a network of blood and lymph vessels runs, as well as a nerve fiber plexus known as Submucosal plexus (Meissner's plexus) referred to as. This plexus represents the so-called Enteric nervous system and innervates (regulation of bowel activity) the bowel independently of the Central nervous system (CNS).
• The following colon muscle layer (Tunica muscularis) is divided into two sub-layers, the fibers of which run in different directions: First, an inner layer Spinal muscle layer (Circular stratum) caused by periodic contractions typical of the large intestine House doors (see above) forms. The outer Longitudinal muscle layer (Stratum longitudinal) is at the so-called Tenien (see above) somewhat crowded together. Between this ring and the longitudinal muscle layer runs a network of nerve fibers, the Myenteric plexus (Auerbach plexus), which innervates these muscle layers. These muscles are responsible for the wave-like movement of the intestine (Peristaltic movement).
• Another shift shift follows (Tela subserosa).
• The conclusion is a cover of the peritoneum (peritoneum) that lines all organs. This coating is also called Tunica serosa.

"Internal organs" illustration

1. Thyroid cartilage / larynx
2. Windpipe (trachea)
3. Heart (cor)
4. Stomach (gaster)
5. Large intestine (colon)
6. Rectum
7. Small intestine (ilium, jejunum)
8. Liver (hepar)
9. lung

Function and tasks

In the large intestine, the intestinal contents are primarily thickened and mixed. In addition, the large intestine is responsible for the urge to defecate and defecate.

1.Motility
The physician understands motility to be the totality of Movements of the colon. They serve to thoroughly mix the food, but also to transport the intestinal contents towards the rectum:

a) Mixing movements
They occupy the bulk of the movements in the colon and are at a maximum frequency of 15 movements / minute rather slowly. In a normal and healthy adult, the food pulp lingers in between 20 and 35 hours in the colon. However, this time fluctuates considerably, so that depending on the food components and mental state, the length of stay can increase to up to 70 hours! The vigorous mixing of the intestinal contents ensures sufficient resumption (absorption) important nutrients and water.

b) Transport movements
Transport movements in the large intestine are rather rare. Instead, they appear after meals as so-called "Mass movements" on. They transport the intestinal contents into the rectum and are associated with an urge to defecate if the intestine is sufficiently full. This is often followed by defecation with a total daily amount of stool of around 100-150g per day.

2. Resumption
Basically, the large intestine plays a rather role in re-absorbing nutrients and water subordinate Role. A large part of this happens in the small intestine, so that the feces are only finally thickened and covered with a slippery layer of mucus.

3. intestinal flora
Our large intestine naturally houses a large number of them bacteriawhich fulfill indispensable functions in digestion.It is estimated that there are around 1011-1012 bacteria per milliliter of intestinal contents! They break down undigested, vegetable fibers (e.g. cellulose) and produce important nutrients such as Biotin (Vitamin B7) or vitamin K.

Stool reflex (defecation reflex)

When the rectal ampoule fills with feces, the intestinal wall is stretched at this point and the filling level is measured by receptors (feelers). The Stretch receptors send signals to the interconnection systems in the Spinal cord and brain. When stool is “allowed” by the brain, a signal is sent to Relaxation of the external anal sphincter sent and the stool (defecation) initiated.

Colon pain

Colon pain can have different causes. The most common are:

Appendicitis (Appendicitis)
Popularly the inflammation is the Appendix (Latin: appendix vermiformis) also known as appendicitis. Strictly speaking, however, this term is incorrect because it is not appendix (Latin: Caecum), but only its appendage is inflamed! At the beginning of the disease, those affected typically feel a dull, non-localizable pain in the Middle or upper abdomen. Within the first 8-12 hours, the pain migrates to the right lower abdomen. There it increases in intensity over time, so that patients suffer from severe, often burning pain. The Mc-Burney point and the Lanz point are particularly sensitive to pain.

Diverticulitis
Diverticula are understood to be Protuberances the colon wall outwards. As a rule, they do not cause any pain and therefore often go unnoticed for a long time. It is now known that the risk of colon cancer increases with size. The mucous membrane of the diverticulum can be damaged by various causes, e.g. food components that are difficult to digest. This is how germs get in and cause Inflammation. In the worst case scenario, it can be an inflamed diverticulum set out (perforate) and such a dangerous one Peritonitis (Latin: peritonitis) cause. In over 90% of cases, the diverticulum is found in the Sigmoid colon. Therefore, sufferers experience diverticulitis left-sided Pain in the lower abdomen.

Irritable bowel syndrome
Irritable bowel syndrome (also called irritable bowel syndrome, irritable bowel syndrome or functional bowel problems) is a collective term for chronic Abdominal discomfort that cannot be explained by other clinical pictures. Patients suffer from pain in the entire Abdominal area, constipation, Diarrhea, gas and bloating. Since there is no permanent organic damage with this disease, it is initially not "dangerous". Instead, a close connection between mental discomfort (stress, anger, etc.) and irritable bowel syndrome has been proven. Those affected very often feel a high level of suffering.

Symptoms

Pain:
Abdominal pain can indicate a disease of the colon. A distinction is made primarily between cramp-like, stabbing, burning, pressing, colicky and pulling abdominal pain. Heat applications (e.g. hot water bottle) can provide relief in many cases.

Diarrhea:
Under diarrhea (Diarrhea) one understands repeated occurrence of too liquid stools and is no disease in its own right, but only a symptom. For example, it can often be observed in inflammation of the large intestine. Uncomplicated courses usually do not require therapy. However, if diarrhea persists over a longer period of time, the strong loss of fluids and minerals must be compensated for (e.g. by infusions).

Constipation:
constipation (Constipation) is one of the widespread diseases of our time. In addition to e.g. poor nutrition, lack of fluids and exercise or metabolic disorders, adhesions, diverticula or tumors in the colon can cause constipation. The therapy depends on the cause of the problem. Increased fluid intake is always advisable.

Common illnesses

To the most common bowel diseases counts among other things Inflammation of sacs in the intestinal wall, the so-called. Diverticulitis. If such diverticulitis occurs more often, one speaks of a so-called. Diverticulosis. It is believed that this inflammation is caused by Stool or build-up of food Put pressure on the already thin wall of the diverticulum. So can bacterial Infections in surrounding connective tissue and in this way one Peritonitis trigger. With 95% diverticulitis occurs at a distance most common in the sigmoid on - the S-shaped area of ​​the large intestine, which is in the pool runs. Diverticulitis manifests itself through the classic symptom triad of Pain in the left lower abdomen, fever and one increased number of white blood cells. Therapy is usually conservative (i.e. no surgical interventions), characterized by the administration of Antibiotics and a strict one diet.

Another common condition is that Appendicitis, the so-called. appendicitis. It can be by naturally existing Components of the intestinal flora or pathogensthat over the blood den Intestines reach, be evoked. The symptoms of appendicitis are mostly diffuse, i.e. not clearly assignable. She expresses herself through nausea, Vomit and Pain in the upper abdomen.

Another common colon disease are the Polyps. They are thickened growths the innermost Intestinal liningthat protrude into the intestinal lumen. Polyps are benign tumors and thus harmless in itselfHowever, in the long run there is an increased risk of them too Colon cancer ulcers degenerate.
A serious bowel disease that not quite as often like the above is is Crohn's disease (named after the American gastroenterologist Burril Crohn). Crohn's disease is one inflammatory disease of the gastrointestinal tract, more precisely all the wall layers of the intestine, both in the large intestine and in the Small intestine can occur. It can also be used to Ulcer formation, Bottlenecks inside the intestine and so-called Fistulas (Connecting corridors with other organs). Typical of Crohn's disease are, on the one hand, the so-called. segmental infestation patterns, i.e. that diseased intestinal sections alternate with healthy ones and that occur in bursts. So people who suffer from Crohn's disease can symptom-free for a long time be.
How exactly that Illness arises, is also today not yet finally clarified. However, it is believed that several factors like one genetic predisposition, bad Eating habits and a Inflammatory response, in which the body makes antibodies against cells in the intestine, are involved. A disease of Crohn's disease is apparently favored by To smoke cigarettes and taking the pill.
In Crohn's disease patients, the disease usually manifests itself through unspecific symptoms how Weight loss, fatigue, Pain in the right lower abdomen and (mostly bloodless) Diarrhea. Furthermore will Anal fissures or Ulcers and aphthae in the oral cavity described. As things stand today, Crohn's disease is incurable. Therapy consists of Relieving attacks and their frequency, through the administration of drugs that immune system dampen.

Another serious bowel disease is the so-called. Ulcerative colitis, a chronic inflammatory bowel disease that also in batches occurs. She spreads continuously from the anus towards the oral cavity off, with what are known as Ulcerations, i.e. defects in the intestinal mucosa. Usually ulcerative colitis occurs between the ages of 20 and 40 on.
The mechanism that leads to the triggering of the disease is similar to that of Crohn's disease, not finally clarified and probably also a mix of components such as genetics, infections, and diet. The intestinal disease ulcerative colitis usually manifests itself through bloody slimy diarrheathat can also occur at night. These go together with so-called. Tenesmen along with what one is painful need to stool or urinate understands. Affected people sometimes also complain about Weight loss, fever and sometimes severe abdominal pain.
The ulcerative colitis is due to a complete surgical removal of the colon curable.

Among the diseases of the large intestine is also the so-called. Irritable bowel syndrome often. Irritable bowel syndrome is one Disease not clearly defined of the intestine, which is put in patients who are over different abdominal complaints complain and in which other organic diseases of the gastrointestinal tract have already been excluded. Irritable bowel syndrome is not uncommon psychosomatic illnesses assigned. Women are about affected twice as often like men. Since the complaints are very different and the causes can usually not be clearly identified, the therapy varies considerable.

Another inflammatory colon disease is the so-called Pseudomembranous colitisthat sometimes also on the actually poor in bacteria Skip the small intestine can. This ailment usually follows one prolonged antibiotic therapy. This also includes parts of the naturally occurring intestinal bacteria killed, so that especially the Intestinal germs multiply unhindered resistant to the antibiotics you are taking. Especially Bacteria of the species Clostridium difficile multiply here more intensely. They produce toxins in large quantities Trigger inflammatory reactions. In the course of this disease, the intestinal walls become one A substance called fibrin apart, which when looking at im As part of a colonoscopy appears like a coating (a membrane), however strippable is (hence the prefix 'pseudo'). The therapy of choice is this Administration of antibioticsthat can kill said strains of bacteria.

The colon meridian

Observations on the Colon meridian. In traditional Chinese medicine, the meridian is one Channel of the human bodythrough which the life energy flows, whereby each meridian can be assigned to an organ system. The lie on these meridians Acupointsthat at Acupuncture with needles, at Acupressure by applying pressure treated with the finger. It must be mentioned that it is neither for the existence of meridians nor for the broad effectiveness of acupuncture or acupuncture sound scientific evidence gives.

The colon meridian points 20 acupuncture points on. It runs from the index finger over the outside of the arm up to the side wing of the nose. However, puncturing or pressing points on the colon meridian helps by no means only against complaints of the large intestine, so the puncture can be the place where the bone of the index finger and thumb (which is considered to be the most important 'anti-pain point') allegedly also alleviate discomfort fever and Nosebleeds impact. It is also said to have an anti-inflammatory effect.

With regard to the colon meridian, healers take following the ideas of the Traditional Chinese Medicine treat that the large intestine is also heavily involved in the Human emotion formation is involved. (There are recent gains in knowledge in pharmacology, which allow such a conclusion.) You speak to him in the sense of an interaction between the so-called Abdominal brain (see also enteric Nervous system) and Cranial brain admitted that he participated in the coping with the past contributes. After this presentation it appears for example plausiblethat someone who is struggling to find his Letting go of the past, also has a hard time with it, Letting go of the chair (in the sense of leaving). This explains e.g. in traditional Chinese medicine the constipation.

Summary

In an adult, the total length is approx. 150 cm. The ascending part of the colon follows the appendix (Ascending colon), followed by the transverse branch of the colon (Transverse colon, Transverse colon). It then continues with the descending part of the colon (Descending colon), which then moves into the S-shaped part of the large intestine, the Sigma (Sigmoid colon), opens. The last section of the digestive tract then lies in the small pelvis Mast- or rectum (rectum), which serves as a reservoir for the intestinal contents and through the Anal sphincter (Anal sphincter) is sealed to the outside.

meridian
According to the ideas of traditional Chinese medicine (TCM) there are 12 different "channels" or channels through which the life energy "Qi" flows on the body surface. Each of these meridians is assigned to an organ area. Targeted stimulation of the points on it, either with fine needles in acupuncture or finger pressure in acupressure, can stimulate the body to heal.
The meridian of the large intestine begins at the Tip of the index finger and runs towards the thumb (lat .: radial) towards the outside of the elbow. From there it pulls over the upper arm to the highest point of the shoulder to the 7th cervical vertebra. Now the large intestine meridian runs into the collarbone, from there to the lungs and finally into the large intestine itself. There is also a connecting line between the collarbone, the neck and the cheek. From there it goes around the upper lip and pulls to the opposite side.