spleen

Question 1

spleen is surrounded by?

Answer 1

a connective tissue capsule

Question 2

the parenchyma of the spleen is divided in to two

Answer 2

• red pulp

- white pulp

Question 3

what does the white pulp & red pulp correspond to?

Answer 3

lymphocyte rich area (white)

blood rich area (red)

Question 4

what forms the framework of the spleen

Answer 4

reticular connective tissue

Question 5

what does the white pulp consist of?

Answer 5

-lymphocytic aggregations around the central arterioles

Question 6

the central arteriole are branches of?

Answer 6

trabecular arteries which is a branch of the splenic artery

Question 7

the white pulp is divided into 3 areas

Answer 7

-periarteriole lymphatic sheath (PALS)
-splenic nodule (malpighien nodules)
marginal zone

Question 8

what is PALS and what does it consist of

Answer 8

• aggregation of l.c that surrounds the central arteriole,
• T-dependant area
• show thinkenings knows as splenic nodules

Question 9

what is the splenic nodule

Answer 9

B-dependent area,the central arteriol surrounded by the splenic nodule has an eccentric position

Question 10

what is the marginal zone? and what does it consist of?

Answer 10

• composed of loose lymphoid tissue
• region between red and white pulps
• contains marginal sinuses
• rich in macrophages
• B-depedant area

Question 11

what does the red pulp consist of?

Answer 11

• splenic cords (cords of billroth)

- splenic sinuses

Question 12

the splenic cords

Answer 12

• macrophages
• plasma cells
• cellular elements of blood
• ** all situated in the loose mesh work of the reticular cells

Question 13

the splenic sinuses

Answer 13

are wide cavities, which are lined by discontinous endothelium there are wide spaces between these cells

Question 14

what is around the splenic sinuses

Answer 14

the basal lamina which is discontinous,

riticular fibers surround sinuses mainly in a transverse direction

Question 15

what are the endothelial cells of the sinuses called?

Answer 15

stave cells

Question 16

the central arterioles in the periphery of the white pulp or red pulp is called?

Answer 16

pulp arteries, which give several straight branches called the penicilliform arterioles

Question 17

where does the blood from the penicilliform arterioles flow to?

Answer 17

into the capillaries that may open into the intercellular space of the red pulp cells (open circulation)

Question 18

what is closed circulation

Answer 18

when the penicilliform arterioles open into the wide splenic sinuses