22 - Immunity Flashcards
Two functions of the lymphatic system:
- draining interstitial fluid
2. providing mechanism for defence against disease
What are some tissues that make up the lymphatic system?
lymph vessels
lymph (fluid)
reticular connective tissue containing a large # of lymphocytes (T, B, and NK cells)
red bone marrow
What are Peyer’s patches?
groups of lymphoid follicles in the mucus membrane lining your small intestine
Lacteals run down the centre of a villus (fingerlike projection) and are found in the….
small intestine
Lymphatic vessels do/don’t have valves
Do
What are the 6 lymph trunks, from inferior to superior?
Lumbar Intestinal Cisterna chyli (dilated sac at lower end of thoraic duct) Broncho-mediastinal Subclavian Jugular
What is the cisterna chyli?
A dilated sac at the lower end of the thoracic duct, where the intestinal trunk and two lumbar trunks join the thoracic duct
The thoracic duct begins at the _____ which is found anterior to ___.
begins in the cisterna chyli, anterior to L2
Primary lymphatic organs/tissues (where lymph cells mature) include the…
red bone marrow & thymus
Secondary lymphatic organs/tissues (where immune responses occur) include the…
lymph nodes/glands (incapsulated)
spleen
lymphatic nodules (lymphoid tissue without a defined capsule)
Differentiate lymphatic organ vs. tissue
organ: covered by a capsule
tissue: no capsule
What 4 types of cells are found in the CORTEX of the thymus gland?
immature T cells (only 2% survive)
dendritic cells (help T cells mature)
epithelial cells (produce thymic hormones)
macrophages
Hassall’s corpuscles are the site of ____ in the ____ of the thymus gland.
site for T cell death in the medulla of the thymus gland
The largest groups of lymph nodes are found in the…
breast, axillae, and groin
The largest single mass of lymphatic tissue in the body is the _____, although it does NOT filter lymph.
spleen
