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1. Name: A.JENIFA
III BSC Zoology

2. DEFINITION:
The organs concerned with The
Production of immune cells and
immune reaction are called
lymphoid organs.
× Primary lymphoid organs.
× Secondary lymphoid organs.
2.Types

3. PRIMARY LYMPHOID ORGANS
Major Of lymphopoiesis*.
Prodution centres & Army head
Quarters of the immune system.
Largeat birth and theyatrophywithage.
..
.

4. THYMUS OF
MAN

5. THYMUS OF CHICKEN
* The bird is made up of 7 lobes.
* Thymus is covered by fibrous capsule.
* Organized into lobules.
* Separated from one another by septa
called trabeculae.

7.  Medulla consists of vascular structure, reticular
Epithelial cells & scattered lymphocytes.
 T lymphocytes mature in the thymus.
 It brings about cell mediated immunity.
 It bring about graft rejection.

8. Thymectomy
 Surgical removal of thymus.
 Removed from mice soon after birth.
 Suffered from hunched appearance, ruffled
fur and diarrhoea.

9. oPrimary lymphoid organ in birds.
oTraining centreforthearmyofB lymphocytes.
o Cells present in yolk sac, liver and bone marrow.
o Bursa is a sac- like lymphoepithelial structure.
o Outer cortex and an inner medulla.

10.  Primary lymphoid organ.
 Soft tissus located with in the cavities bones.
 It is the Army head Quarter.
 Red marrow.
 Yellow marrow.
 stroma.
Types

11. 1.Red marrow:
Medulla ossium rubra.
Consists of mainly haematopoietic.
Cantains blood vessels and capillaries.
2.Yellow marrow:
Medulla ossium flava.
Found interior of long bones .
Cantains blood vessels and capillaries.
3.Stroma :
Provides a haematopoietic micro environment.
Generates colony stimulating factors .
Provides iron for RBC.

12. Bone Marrow Barrier
Inhibit the immature blood cells from leaving the maroow.
Lymphatic Role
 Generate lymphatic cells .
 It is primary lymphoid organ.
 Back flow of lymphatic fluid into the bone marrow.
Disease of bone marrow
 Malignancial.
 Anaemia.
 Tuberculosis.
 Leukemia.

13. Bone Marrow Examinations
 Bone marrow biopsy.
 Bone marrow aspiration.
 Early humans ate bone marrow of bones left by lions .
 Vietnam beef bone marrow is used as soup.
Functions of bone Marrow
 Malignancial.
 Anaemia.
 Tuberculosis.
 Leukemia.
Bone Marrow Food