第十一次课 淋系统.ppt

The network of lymphatic vessels begins with lymphatic capillaries. They are closed-ended tubes that form vast networks in the intercellular spaces within most tissue. Small lymphatic capillaries converge into lager lymphatic vessels. Here we see the video clip of valve of lymphatic vessel. According to it’s position ,the vessels can be divided into two groups ,: superficial and deep lymphatic vessel.. The superficial lymphatic vessel lies in the superficial fascia, along with the superficial vein. Deep lymphatic vessel positioned under the deep fascia or along with the deep blood vessel and nerves. In turn , the lymphatic vessels unite to form the lymphatic trunk, There are nine lymphatic trunk in our body , each is in charge of drainage of lymph from different subdivided regions . Eight trunks in four pair on either side of the body, there are,Jugular trunks, subclavian trunks, bronchomediastinal trunks, lumber trunks. mesenteric trunks . Interconnecting lymph trunks eventurally empty into one of the two principal duct: right lymphatic duct and the thoracic duct. The right lymphatic duct receives the right jugular, right sublavian and right bronchomediastinal trunk. carries the lymph from right upper extremity ,right thoracic region and right side of the head and neck. And empties into right venous angle. The lymph from the rest parts of the body empty into thoracic duct. Cisterna chyli is the starting place of this duct, this saclike enlargement is about 6 centimeters long. located in the lumbar region of the abdominal cavity, just in front of the 1st or 2nd lumbar vertebrae. receives and temporarily stores lymph as it travels upward from the lower portion of the body A lymphatic organ is a mass of lymphatic tissue that is surrounded by a connective tissue capsule or covered by an epithelium Lymphatic tissue, often referred to as lymphoid tissue, is defined as reticular connective tissue that is infiltrated with lymphocytes. Much lymphatic tissu