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十二指肠的位置在哪里? - Where is the location of the duodenum?

文章导读

十二指肠是人体最为关键的一部分,而十二指肠位于人体的腹部与胃部之间,而十二指肠是人体小肠当中肠管最大,位置比较深的一个位置,而且十二指肠的作用比较关键,如果十二指肠出现疾病就会容易导致一些消化功能的问题,对人体的伤害非常大,平时多注意肠道的健康

十二指肠的位置在哪里? - Where is the location of the duodenum?

十二指肠的位置在哪里?

十二指肠,是人体介于胃与空肠之间的一个器官,十二指肠成人长度为20~25cm,管径4~5cm,紧贴腹后壁,是小肠中长度最短、管径最大、位置最深且最为固定的小肠段。十二指肠的形状呈“C”形,包统胰头,可分球部、降部、水平部和升部四部。

组成

观察标本十二指肠横切片(H.E染色)肉眼观察粘膜染紫红色,向外依次为粘膜下层,肌层及外膜.粘膜和粘膜下层向管腔内突起形成环状皱襞。

低倍和高倍观察十二指肠壁由内向外分4层。

十二指肠的位置在哪里? - Where is the location of the duodenum?

1、粘膜:

①上皮:为单层柱状上皮,主要由柱状细胞构成,含少量的杯状细胞和内分泌细胞.游离面有薄层染红色线状结构为纹状缘。

②固有层:为结缔组织,含大量肠腺,丰富的毛细血管,毛细淋巴管,神经,散在的平滑肌细胞及淋巴组织.小肠腺为单管状腺,开口于相邻的绒毛之间,腺上皮与绒毛上皮相连,细胞构成与小肠上皮相似,小肠腺底部有成群分布的潘氏细胞。在标本上不易看到。

③粘膜肌层:为平滑肌,肌细胞的切面是否一样如何排列小肠绒毛:为固有层和上皮共同凸向肠腔形成的叶状结构,游离在肠腔内的团状结构是绒毛的横切面.与小肠腺相比,绒毛有何特点绒毛的中央,可见管腔较大,由单层内皮构成的中央乳靡管,即毛细淋巴管.管周围有散在的平滑肌束。

2、粘膜下层:

为疏松结缔组织,含较大的血管,淋巴管及粘膜下神经丛。十二指肠还含粘液性的十二指肠腺.腺上皮细胞为锥形或柱状,胞质染蓝色或空网状,细胞核扁圆形靠近基底部,腺泡腔较小,不规则,导管穿过粘膜肌开口在小肠腺的底部或相邻的绒毛之间.3)肌层:为内环行,外纵行两层平滑肌,在横切面上各为何种切面两层肌之间的结缔组织内可否找到肌间神经丛。

十二指肠的位置在哪里? - Where is the location of the duodenum?

3、外膜:

为薄层疏松结缔组织和间皮构成的浆膜。小肠Smallintestine上起幽门,下接盲肠,在成人全长5~7m,分十二指肠、空肠与回肠三部。十二指肠Duodenum介于胃与空肠之间,胰管与胆总管均开口于十二指肠。因此,它既接受胃液,又接受胰液和胆汁的注入,所以十二指肠的消化功能十分重要。十二指肠的形状呈“C”形,包统胰头,可分球部、降部、水平部和升部四部。

4、球部:

十二指肠球部又称上部长约5cm,起自胃的幽门,走向右后方。至胆囊颈的后下方,急转成为降部,转折处为十二指肠上曲。十二指肠球部近幽门约2.5cm一段肠管,壁较薄,粘膜面较光滑,没有或甚少环状襞,此段称十二指肠球Duodenalbulb,是十二指肠溃疡的好发部位,但是十二指肠溃疡,在临床统计学上,不会转变为癌症。

5、降部:

十二指肠降部是十二指肠的第2部,长约7—8cm,由十二指肠上曲沿右肾内侧缘下降,至第3腰椎水平,弯向左侧,转折处为十二指肠下曲。降部左侧紧贴胰头,此部的粘膜有许多环状襞,其后内侧壁有胆总管沿其外面下行,致使粘膜呈略凸向肠腔的纵行隆起,称十二指肠纵壁。纵襞的下端为圆形隆起,称十二指肠大乳头,是胆总管和胰管的共同开口。胆总管和胰管在此处,组成肝胰壶腹。十二指肠大乳头附近有一壶瓣,可以关闭胆总管或胰管,引起相应疾病。大乳头稍上方,有时可见十二指肠小乳头,这是副胰管的开口之处。


Reading guide

Duodenum is the most critical part of the human body, and the duodenum is located between the body's abdomen and the stomach, and the duodenum is the largest and deeper position of the intestine in the small intestine of the human body, and the function of the duodenum is more critical. If the duodenum has a disease, it will easily lead to some digestive functions. Problem, the human body is very harmful, usually pay more attention to the health of the intestinal tract.

十二指肠的位置在哪里? - Where is the location of the duodenum?

Where is the location of the duodenum?

Duodenum is an organ between the stomach and the jejunum. The length of the duodenum is 20 ~ 25cm and the diameter of the duodenum is 4 ~ 5cm. The duodenum is closely attached to the posterior wall of the abdomen. It is the shortest length, the largest diameter, the deepest position and the most fixed small intestine in the small intestine. The shape of the duodenum is "C" shaped, including the pancreatic head, which can be divided into four parts: bulb, descending, horizontal and ascending.

Form

Observing the transverse section of the duodenum (H.E staining), the mucous membrane of the mucous membrane was observed by the naked eye. The submucosa, the muscularis and the outer membrane were in turn, and the mucous membrane and the submucosa protruded into the cavity to form a ring fold.

The duodenal wall was divided into four layers at low and high magnification.

十二指肠的位置在哪里? - Where is the location of the duodenum?

1, mucous membrane:

1. Epithelium: a monolayer columnar epithelium, mainly composed of columnar cells, containing a small amount of goblet and endocrine cells. The free surface has a thin layer of red linear structure with a striate edge.

(2) propria: connective tissue with a large number of intestinal glands, rich capillaries, capillary lymphatics, nerve, scattered smooth muscle cells and lymphoid tissue. The small intestine is a single tubular gland that opens between adjacent villi, the gland epithelium is connected with the villi epithelium, the cells are similar to the small intestinal epithelium, and there are groups at the bottom of the small intestine. The pans cells of the cloth. It is not easy to see on the specimen.

(3) muscularis layer: for smooth muscle, the chorion of the small intestine is arranged in the same way that the cut of the muscle cells is the same as the lamina of the lamina and the epithelium. The mass of the villus is the transverse section of the villus. Compared with the small intestinal gland, the villi are characterized by the central part of the villi, and the lumen is larger and is seen from the single layer. The skin consists of a central lactic duct, the lymphatic capillary, surrounded by scattered bundles of smooth muscle.

2, submucous layer:

It is loose connective tissue with large blood vessels, lymphatic vessels and submucosal plexus. Duodenum also contains mucous duodenal glands. The epithelial cells of the gland are conical or columnar, the cytoplasm is blue or empty, and the nucleus is near the base, the cavities of the acinus are smaller, irregular, the ducts pass through the mucosa at the bottom of the small intestinal gland or the.3 between the adjacent villi, and the inner circle is smooth and two layers smooth outside. In the transverse section, the muscles can find intermuscular plexus in connective tissue between the two layers of muscles.

十二指肠的位置在哪里? - Where is the location of the duodenum?

3. Outer membrane:

It is a serous membrane composed of thin loose connective tissue and mesothelial cells. The Smallintestine of the small intestine is pyloric, and the cecum is next to the cecum. The total length of the adult is 5 to 7m, and the duodenum, jejunum and ileum are three. The duodenum Duodenum is situated between the stomach and the jejunum, and the pancreatic duct and the common bile duct are all located in the duodenum. Therefore, it not only accepts gastric juice, but also accepts the infusion of pancreatic juice and bile, so the digestive function of duodenum is very important. The shape of the duodenum is "C". The head of the pancreas is divided into four parts: the bulb, the descending part, the horizontal part and the ascending part.

4, the ball:

The duodenal bulb is also called the upper minister about 5cm, from the pylorus of the stomach to the right rear. To the lower part of the neck of the gallbladder, it turned sharply into the descending part, and the turning point was duodenal flexion. Duodenal pylorus approximately 2.5cm a segment of intestinal tube, thin wall, smooth mucous membrane, no or little ring folds, this segment of the duodenal ball Duodenalbulb, is a good location of the duodenal ulcer, but duodenal ulcer, in clinical statistics, will not be transformed into cancer.

5, lower part:

The descending duodenum is the second part of the duodenum, which is about 7 - 8cm long, descending from the upper part of the duodenum to the medial margin of the right kidney, to the level of the third lumbar spine, to the left side, and the lower part of the duodenum in the turning point. The descending left side of the pancreas is closely attached to the head of the pancreas. There are many ring folds in this mucous membrane. The inner wall of the inner wall descends along the outer wall of the bile duct, causing the mucosa to protruded slightly to the cavities of the intestine, which is called the longitudinal wall of the duodenum. The lower end of the longitudinal fold is a circular eminence called duodenal papilla, which is the common opening of the common bile duct and the pancreatic duct. The common bile duct and pancreatic duct here constitute the ampulla of the liver and pancreas. There is a pot of flaps near the great duodenal papilla, which can close the common bile duct or pancreatic duct and cause corresponding diseases. The greater nipple is slightly above, sometimes the duodenal papilla, which is the opening of the accessory pancreatic duct.

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