About the Lungs

nccn

most cancers are named after the part of the body where the cancer first starts.
lung cancer begins in the lungs. the lungs are 2 sponge-like organs in the chest.
they bring air in and out of the body, taking in oxygen and getting rid of carbon
dioxide gas, a waste product.

the right lung has 3 sections, called lobes. the left lung has 2 lobes. it is smaller
because the heart takes up more room on that side of the body. the lining around
the lungs, called the pleura, helps to protect the lungs and allows them to move
when you breathe. the (trachea) trachea (windpipe) brings air down into the lungs.
it divides into tubes called bronchi, which divide into smaller branches called bronchioles.
at the end of these small branches are tiny air sacs known as alveoli. most lung
cancers start in the lining of the bronchi, but they can also begin in other areas such
as the trachea, bronchioles, or alveoli.

lymphatic vessels are similar to veins but carry lymph instead of blood. lymph is a
clear fluid that contains tissue waste products and immune system cells. lymphatic
vessels of the lungs lead to nearby lymph nodes inside the chest. these nodes are
located around the bronchi and in the mediastinum (the area between the 2 lungs.)
the names, location, and importance of lymph nodes near the lungs are explained
in the section on staging of lung cancer (see lung cancer staging) and in the diagram
above. cancer cells may enter lymph vessels and spread out along these vessels to
reach lymph nodes. lymph nodes are small, bean-shaped collections of immune
system cells that are important in fighting infections. when lung cancer cells reach
the lymph nodes, they can continue to grow. if cancer cells have multiplied in the
lymph nodes, they are more likely to have spread to other organs of the body as well.

[本贴已被 nccn 于 2007-3-9 0:43:00 修改过]

[本贴已被 guojx 于 2007-3-9 9:53:06 修改过]

nccn

nccn

念羊经

just so so

尚峰

大多数癌症的命名都是以发生癌症的器官的名称来命名的，比如说发生于肺脏的癌症称为肺癌，肺脏是胸腔内两个海绵状的器官，他们将氧气吸入体内，将体内废气如二氧化碳排除体外，右肺有三个叶，左肺有两个叶，左肺较小，因为心脏位于左侧胸腔，包绕肺脏的膜称为粘膜，它的作用是保护肺脏并使其在呼吸时能够运动，气管是将空气带入肺脏的管道，它分成两个主支气管，再往下的分支称为细支气管，细支气管的末端的小囊腔称为肺泡，大多数肺癌发生于主支气管的粘膜，但也可发生于气管、细支气管以及肺泡。
人体的淋巴管和静脉相似，只不过它携带的是淋巴液而不是血液，淋巴液是一种无色透明液体，由组织产生的废物和淋巴细胞组成。肺的淋巴管通向邻近的胸腔淋巴结，这些淋巴结位于两肺之间的纵隔内，围绕在主支气管周围。淋巴结的命名、位置、以及它的重要性我们将在肺癌分期章节中讨论，癌症细胞可能进入淋巴管并沿着它播散到淋巴结，淋巴结都是一些小的黄豆形状的东西，内部含有免疫细胞，这些细胞在抗炎时发挥重要作用，癌细胞到达淋巴结后会继续生长，一旦他们在淋巴结内繁殖，就很可能扩散到身体其他器官。

mzjctmr

学习了，多谢

zyx168

学习了，多谢

stpyscx

谢谢了

yingzuyiyuan

xiexie

清清楚楚

连老外都上咱们的网，了不起！