Esophagus
Esophagus(To do, the ょ to be wordy, Esophagus)
Alimentary canalAt part,Buccal cavity、PharynxTo continue, the food stomach, the tube which is passed organ. In the esophagus, as for digestion of the food it is not done.
Structure and function of esophagus
As for esophagus of person, with adult25? 30 cm, with the neckLarynxTo start on rear side, in the chestBronchial tube、Aortic archAnd so on it passes by rear,Diaphragm(The esophagus fissure hole) penetrating, it reaches to the abdomen. Under diaphragm stomach it is connected. In esophagus 3 placesPhysiological strangulation sectionIt is. The joint of the pharynx, with the region which passes by the rear of the bronchial tube, and the region which passes through the diaphragm, those where the food is plugged well are these places.
As for wall of esophagus, from insideMucous membraneMuscle layer, the exine it can divide. As for the mucous membrane, it was digested say with the mouth, in order not to be hurt by the fact that the food while still shape is maintained passes, dynamically to force, it consists of the layer flat epithelium heavily. The large number which is immediately on the lower stratum of the mucous membraneEsophagus glandBy the fact that the mucus is secreted to the surface of the mucous membrane, there is the function which sort of the food is improved. Muscle layer, does the kind of movement which sends out the food to the stomach by the fact that it contracts in order. We do two-layer structure, as for muscle inside as for wheel running muscle and muscle outside it is traversing muscle. As for muscle of the upper esophagus the side which is close to the mouth with striated muscle, as for muscle of the lower part esophagus the side which is close to the stomach it consists of the smooth muscle. As for these muscles,Autonomous nerveWithout being conscious contraction motion happens in the function. "The throat origin passing, heat you forget", according to word, feeling of the mucous membrane of the esophagus excessively is not acute.
Disease of esophagus
- The esophagus vein lump - in esophagus lower part, the vein tuft of grass has advanced under the mucous membrane, but as for hereHepatocirrhosisAnd so on with liver becomes bad, it hits to the place where the blood of the portal vein detours (portal vein pressure 亢 Shin). This, originally the blood of the expectation which faces to the liver passing the left stomach vein, is in order to escape to the odd vein and the semi- odd vein which are poured to the upper vena cava. Because it is not the originally thick blood vessel, it becomes the circumstance where the blood vessel is easy to tear with the mass blood.
- Esophagus cancer - The cell of the mucous membrane epithelium of the esophagus continues to receive stimulus dynamically with the food, from usually separation and the inserting substituting of the cell are active. There are times when cancer conversion of the epithelium cell happens. Because of that, 90% or more of the esophagus cancer is the flat epithelium cancer. Good it gives out to the especially chest Chubu esophagus.
Relation
- digestive organs
- Digestive organs study
- Science outside chest
