spleen

Question 1

Which of the following is false regarding differences in the spleen when comparing the dog: cat?
• Cat spleen is thinner and smaller
• Splenic extramedullary hematopoiesis is a common finding in cats
• Dog spleens are sinusoidal and cat spleens are nonsinusoidal
• The spleen accounts for about 0.2% of body weight in both dogs and cats

Answer 1

B (rare)

Question 2

Which of the following is true regarding blood supply to and from the spleen?
• The splenic artery is a branch from the celiac artery
• The short gastric arteries anastomose with the pancreatic artery
• The splenic vein goes directly into the portal vein
• The pancreatic artery is a branch from the celiac artery

Answer 2

A true

short gastrics anastomose w/ left gastric
(first the gastrosplenic v then portal vein)
CELIAC –> hepatic+left gastric+splenic
(left limb pancreatic from the splenic a)

Question 3

Which statement is false?
• Maturation of RBCs occurs in the red pulp
• The spleen can store 70% of platelet mass and 30-40% of a dog’s RBC mass
• Macrophages in the marginal zone filter microorganisms
• IgM can be produced in the spleen in response to antigen
• Endocarditis and osteomyelitis can cause chronic antigenic stimulation and lead to generalized splenomegaly

Answer 3

B (30% platelet mass/

10-20% of dog’s RBC mass)

Question 4

t/f Splenosis is the fragmentation and subsequent survival of splenic tissue after trauma

Answer 4

true

Question 5

Name 3 functions of spleen in regards to hematopoiesis

Answer 5

maturation RBC
cull senile RBC
iron stored

Question 6

What are 3 function of the spleen/

Answer 6

Hematopoiesis
Reservoir function (rapid, intermediate and slow pools)
Immunologic function

Question 7

What are siderotic plaques? Siderocalcific plaques?

Answer 7

focal accumulations of iron stores; hemosiderosis from erythrophagocytosis and subsequent hemoglobin breakdown
Gamna-Gandy bodies: hemosiderin, bilirubin and calcium (senile change)

Question 8

How does spleen compare to liver on AUS?

Answer 8

spleen has finer echotexture and more echogenic

Question 9

Which of the following does not cause splenic congestion
A. Congestive heart failure
B. Acepromazine
C. Phenobarbital
D. Midazolam

Answer 9

D midazolam

Question 10

t/f Splenic nodular hyperplasia is less common in cats

Answer 10

True

*non-sinusoidal nature of the spleen in cats creates less opportunity for venous pooling