بافتها و اعضاء سيستم لنفاوي Lymphoid Organs 1 Primary (Central) Lymphoid OrgansPrimary (Central) Lymphoid Organs (Lymphocytes are generated) Bone MarrowBone.

بافتها و اعضاء سيستم لنفاويبافتها و اعضاء سيستم لنفاوي Lymphoid Organs 1Lymphoid Organs 1

•Primary (Central) Lymphoid OrgansPrimary (Central) Lymphoid Organs

((Lymphocytes are generated)Lymphocytes are generated)

•Bone MarrowBone Marrow

•ThymusThymus

Primary (Central) Lymphoid Primary (Central) Lymphoid OrgansOrgans

استخوان استخوان مغز Bone MarrowBone Marrowمغزدر سنين پايين در همه استخوانهادر سنين پايين در همه استخوانهادر سنين باال در استخوانهاي دراز از بين مي روددر سنين باال در استخوانهاي دراز از بين مي رود محل بلوغ لنفوسيتهاي محل بلوغ لنفوسيتهايBBاست است

تيموس تيموسThymusThymus در سنين پايين فعال است و در سن باال تحليل مي روددر سنين پايين فعال است و در سن باال تحليل مي رود محل بلوغ لنفوسيتهاي محل بلوغ لنفوسيتهايTTاست است

Thymus

• small in an adult• site of T lymphocyte production• secretes thymosins

16-14

Figure 1-7

Secondary (Peripheral) Lymphoid Secondary (Peripheral) Lymphoid OrgansOrgans

•Lymphatic Vessels & Capillaries (Lymphatic Vessels & Capillaries (Lymphatic System )

•Lymph nodesLymph nodes

•SpleenSpleen

•Lymphoid tissues associated with mucosaLymphoid tissues associated with mucosa

1.1. Gut associated Tonsils, Gut associated Tonsils,

2.2. Peyers PatchesPeyers Patches

3.3. AppendixAppendix

4.4. Lymphoid Lymphoid FolliclesFollicles (Bronchial-Associated Lymphoid (Bronchial-Associated Lymphoid

Tissue (BALT), Mucosal-Associated Lymphoid Tissue Tissue (BALT), Mucosal-Associated Lymphoid Tissue

(MALT)(MALT)

Figure 1-7

Lymph Function

•Absorption of dietary fats & transports fats to

bloodstream

•Delivers foreign particles to lymph nodes

•Network of vessels that assist in circulating fluids

•Transports excess fluid away from interstitial spaces

•Transports fluid to the bloodstream

•Help defend the body against diseases

Lymphatic Pathways

Lymphatic Pathways

Lymph Movement

• action of skeletal muscles

• respiratory movements

• smooth muscle in larger

lymphatic vessels

• valves in lymphatic

vessels

Lymphatic Capillaries

• microscopic• closed-ended tubes• in interstitial spaces of most tissues

Tissue Fluid and Lymph

Lymph tissue fluid

that has entered a

lymphatic capillary

Lymphatic Vessels

•Lymphatic vessels merge into lymphatic trunks• lymphatic trunks drain into collecting ducts

•Thoracic duct•Right lymphatic duct

Lymphatic Ducts

Figure 1-8 part 1 of 2

Lymph Nodes

Figure 1-8 part 2 of 2

Lymph Nodes

• cervical region• axillary region• inguinal region• pelvic cavity• abdominal cavity• thoracic cavity• supratrochlear region

16-12

Functions of Lymph Nodes

• filter potentially harmful particles

from lymph• immune surveillance by

macrophages and lymphocytes• areas of lymphocyte production

16-13

Spleen

• largest lymphatic organ• upper left abdominal quadrant• sinuses filled with blood• white pulp

• lymphocytes• red pulp

• red blood cells• lymphocytes• macrophages

16-15

Figure 1-9

Figure 1-9 part 1 of 3

Figure 1-9 part 2 of 3

Figure 1-9 part 3 of 3

Figure 1-10

Figure 1-10 part 1 of 2

Figure 1-10 part 2 of 2