Veterinary Histology (lymphatic System.)

Question 1

Collecting tissue fluids from tissues and returning it back to the body is a function of the ………..

Answer 1

Lymphatic system.

Question 2

The Lymphatic System consists of Vascular components which are………. And cellular components which includes……..

Answer 2

A)Lymphatic vessels, Lymphatic ducts and Lymphatic Capillaries.

B) Lymphatic nodules, lymphatic nodes, Tonsils, Thymus, Spleen. Mucosa associated lymphatic tissue (MALT),
Bursa of Fabricus.

Question 3

Histologically describe the Lymphatic Capillaries-

Answer 3

It is a blind ended tube consisting only of endothelium

Question 4

Histoloically describe the lymph Vessels.

Answer 4

Smaller lymphatic vessels have an endothelium surrounded by few smooth mu

Question 5

Describe the medium- sized lymphatic vessel histologically.

Answer 5

Thin tunics intima(Endothelium surrounded by few collagen& elastic fibre
Thin tunica Media with helically arranged smooth muscle, elastic fibers,
Thin tunics Adventitia- Collagen andelatic fibre ; few smooth muscles.

Question 6

Lymphatic Duct histologically has what features?

Answer 6

Thin tunica intima with endothelium and subendothel layer of collagen and elastic fibres. , some longitudinal smooth muscle.
Tunics media is the thickest with longitudinal and circular smooth muscle bundles.
Tunics adventitia is not well developed, coarse collagen fibres, few longitudinal smooth muscle.

Question 7

Lymphatic Nodules

Answer 7

They are spherical aggregation of lymphocytes It is found in loose connective tissue of the body and all lymphatic organs. There are two types Primary and secondary.

Question 8

Structurally describe the Secondary lymphatic nodule

Answer 8

It has a germinal centre(light staining) which has mature and immature lymphocytes and a peripheral cortex of tightly packed lymphocytes all enmeshed in the stroma of reticular fibres and large reticular cells.

Question 9

……..is a bean shaped organ covered by a capsule if dense and possesses capsular extensions called trabeculae

Answer 9

Lymph node(They are found along lymphatic vessels, and which filter microorganism from lymph.)

Question 10

The medullar of the the lymph nodes is made of structures known as……….&…..,

Answer 10

Medullary cords and Medullary Sinuses.

Question 11

At the outer cortex are ……….. Where the B-cells proliferate into ………………

Answer 11

germinal centres ….,.. Antibody secreting plasma cells

Question 12

True or false outer cortex has lymphatic nodules that caontain T-Cells

Answer 12

False, the outer cortex of lymph nodes has lymphatic nodules that mostly contain B cells.

Question 13

In the cortex small lymphocytes sits in spaces between the ………..in the cortex

Answer 13

Reticular Fibres.

Question 14

The inner medulla contains mostly ……. The deep cortical and Medullary cords contain ……. And …….

Answer 14

a) Mostly T-Cells b) B-Cells and Plasma cells.

Question 15

Give the location of tonsils

Answer 15

The walls of the pharynx, and nasophary and the base if the tongue.

Question 16

……….has it’s luminal surface covered with a stratified squamous epithelium, possesses crypts and have many b)..…..below it’s epithelium. Which also have …………

Answer 16

Tonsil, lymphoid follicles, germinal centers