Lymphoid II

Question 1

lymph nodes

Answer 1

line of defense against antigens which penetrate the epithelium and MALT and gain access to underlying connective tissue

Question 2

components of lymph nodes

Answer 2

dense connective tissue capsule, reticular fibers, macrophages, reticular cells

Question 3

afferent lymphatics

Answer 3

pierce the outer connective tissue capsule and deposit lymph in the subcapsular sinus

Question 4

subcapsular sinus

Answer 4

continuous with cortical and medullary sinus, where lymph enters

Question 5

hilum

Answer 5

location of the draining efferent lymph

Question 6

lympathic sinuses are line with ____ _____ that permits cells and antigens to enter the node

Answer 6

discontinuous endothelium

Question 7

nodules are found in what region of the lymph nodes?

Answer 7

outer region of the cortex

Question 8

paracortex

Answer 8

devoid of nodules and is T cell rich (thymus dependent zone)

Question 9

high endothelial venules

Answer 9

in the paracortex, allows circulating lymphocytes to enter the lymph node

Question 10

selectins

Answer 10

allow lymphocytes to home in on the lymph nodes and crawl through the walls

Question 11

medullary cords

Answer 11

loose CT (containing reticular fibers), highly cellular

Question 12

medullary sinuses

Answer 12

venous channel running between cords, distontinuous endothelium, traversed by reticular fibers

Question 13

paracortical reaction

Answer 13

during a viral reaction, more selectins are expressed resulting in more lymphocytes adn swelling of the paracortical region

Question 14

Hodgkin lymphoma

Answer 14

excess proliferation of lymphocyttes with Ree-sternberg cells

Question 15

Reed-Sternberg cells

Answer 15

large cells with bilobed nucleus (owl eye appearance)

Question 16

the spleen is covered by…

Answer 16

a squamous epithelium (mesothelium) and underlying is a thick connective tissue capsule

Question 17

trabecular beams

Answer 17

continuous with the capsule, penetrate the spleen

Question 18

Does the spleen have a cortex and a medulla

Answer 18

NO

Question 19

periarterial lymphoid sheath

Answer 19

of the white pulp, contains both nodular and diffuse tissue and surrounds central arteries

Question 20

Are there reticular fibers in the vessels of the spleen

Answer 20

NO (except in the marginal zone)

Question 21

marginal zone

Answer 21

region between the red and white pulp, receives blood from the central arteries and promotes antigen interactions

Question 22

red pulp

Answer 22

containts cords and sinuses, filters red blood cells

Question 23

terminal sheathed capillaries empth into…

Answer 23

the meshwork of the red pulp cords

Question 24

filtrations slits

Answer 24

holes in the endoletial venules of the sinuses that filter out mishapen red blood cells