Talk:Draft 2016: Difference between revisions

Revision as of 18:24, 26 February 2016

Location throughout the entire body - concentrated in axilla, groin, lung, gastrointestinal tract mesenteries
Small (1 mm - 2 cm) encapsulated organ (diffuse lymphoid tissue - no capsule)
Antigen transformed lymphocytes from the blood
In lymph vessel pathways “filter” lymph
- Afferent - towards node (A - arrives at the node)
- Efferent - away from node (E - exits the node)

Mesenteric lymph nodes

Lymph Node Functions
In lymph vessel pathways “filter” lymph Immune - detect infections from peripheral tissues skin, respiratory tract, gastrointestinal tract, etc. secondary lymphoid organ return extracellular fluid to circulation

Lymph Node Structure

Fetal thymus	Young medulla	Young cortex

Connective Tissue

Capsule - dense connective tissue (irregular CT, some adipocytes))
Trabeculae - dense connective tissue
Reticular Tissue - Reticular cells and fibers, supporting meshwork (collagen type III)
- Reticular cell produces reticular fibers (collagen type III) and surrounds the fibers with its cytoplasm
- reticular fibbers can also be produced by fibroblasts

Important - Please note that the lymphocytes exit from the node by efferent lymphatic vessels.

‎‎Lymph Node 7

T and B motility

‎‎Lymph Node 8

T and B interaction

High Endothelial Venules

Links: Immunobiology - Figure 1.8. Organization of a lymph node

@@ Line 29: / Line 29: @@
 * secondary lymphoid organ
 * return extracellular fluid to circulation
-| [[File:Lymph_node_cartoon_01.jpg|Lymph_node_cartoon_01.jpg|600px]]
+| [[File:Lymph node structure.jpg|400px]]
 |-
 |}
@@ Line 38: / Line 38: @@
 ! Lymph Node Structure&nbsp;
 |-
-| [[File:Lymph node structure.jpg|400px]]
+|
 | [[File:Lymph node cartoon.jpg|400px]]
 |-
@@ Line 51: / Line 51: @@
 * Capsule (thin) with trabecular or septa (dense connective tissue)
-[[File:Lymph node cartoon 03.jpg|600px]]
+[[File:Lymph_node_cartoon_01.jpg|Lymph_node_cartoon_01.jpg|600px]]