淋巴系统解剖_第1页
淋巴系统解剖_第2页
淋巴系统解剖_第3页
淋巴系统解剖_第4页
淋巴系统解剖_第5页
已阅读5页,还剩10页未读 继续免费阅读

下载本文档

版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领

文档简介

1、ch 23: the lymphatic systemgoals1.discuss the organization of the lymphatic system, including the vessels, principal lymph nodes, thymus, and spleen2.explain the relationship between the lymphatic and circulatory systems, and the role of lymphoid tissue structures and lymphocytes in the bodys defens

2、eaccessory to cardiovascular system there are two drainage systemsoverview of the lymphatic systemincludes, vessels, fluid, and nodes or nonsecreting glands. lymphatic vessels convey fluid from the periphery to the veins. the fluid, lymph (=clear spring water), is what seeps out of the blood at the

3、peripheral capillaries. composition is similar to plasma without the proteinslymphatic organs or tissues (glands) are filtering areas and arenas of lymphocyte maturation and competency.major functions of lymphatic systemfiltration of lymphreturn of seeped fluid to c.v. system“education” and producti

4、on of immune system lymphocytestransport of digested lipids from small intestinal lacteals lymph capillariesthin walled endothelium (no bm) with periodic one way valves. in general they parallel veins.closed ends allow fluid flow inward only pick up and recycle extra tissue fluid lymph circulation d

5、ue to ?compare to fig. 23.2location of lymph capillarieseverywhere, except for cns and bone marrow, as well as cornea and cartilage.special set of lymph capillaries in villi of small intestine = lactealsdamaged valves or blockedlymph vessels ?lymphatic vesselscomparable in structure to veinslymph ca

6、pillaries converge to become collecting vessels and end up as eitherthoracic duct or right lymphatic ductthoracic (left lymphatic) ductleft subclavian veinright lymphatic ductright subclavian veincysterna chylifig 23.4largestlymphocytesagranulocytes - large nuclei and small amount of cytoplasm funct

7、ion in identification and inactivation/destruction of pathogenstypes of lymphocytes1.t cells - cellular immunity - specific for previously identified pathogenst helper, t killer, t suppressor, and memory cells2.b cells - humoral immunity - plasma cells produce antibodies specific to the antigen or p

8、athogen; memory cells3.nk cells - non-specific, provide immunological surveillancebone marrow: lymphopoiesislymphocytes are later also produced in thymus, spleen and tonsilsfig 23.7122lc.t. loaded with lymphocytesllymphoid nodules are unencapsulated clusters of lymphocytes ( 1mm). found beneath epit

9、helial lining of respiratory, digestive & urinary tractslmucosa associated lymphatic tissue (malt) in gi tract 5 tonsilsaggregate lymphoid nodules in small intestine (= peyers patches)appendix - walls contain lymphoid tissuelymphoid tissue = adenoidslymph nodes 500 ( 1mm to 25 mm)bean-shaped wit

10、h hilusseveral afferent vessels, one efferent vessel function?popular term “lymph gland” is misnomer. why?contain lots of lymphocytes & macrophagesclinical application: swollen lymph nodesfig 23.9distribution of lnscervical lymph nodes - drain head and neckaxillary lymph nodes - drain arms and b

11、reastspopliteal lymph nodes - drain legs, drain into inguinal lymph nodes - drain lower limbthoracic lymph nodes - drain thoracic visceraabdominal lymph nodes - drain pelvic regionintestinal and mesenteric lymph nodes - drain abdominal viscerathymuslocation above heart, posterior to sternumdivided i

12、nto lobulesonly lymphoid organ that does not fight antigens, it functions as “t-cell academy” blood thymus barrier prevents premature stimulation of developing t-cellsinvolution after pubertyepithelial cells produce thymic hormoneslargest lymphoid organsoft and very blood richred pulp sinusoids containing rbcs lymphoid tissuemajor functions:1. initiation of immune response to antigen

温馨提示

  • 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
  • 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
  • 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
  • 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
  • 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
  • 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
  • 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

评论

0/150

提交评论