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Flashcards in AB-Spleen Deck (45)
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1

The spleen is part of what system

reticuloendothelial system

2

Spleens role before the 5th or 6th month of life

Role in the synthesis of blood proteins

3

After the 5th or 6th month, the spleens role is

Active in the body's defense against disease; its major function is to filter the peripheral blood

4

The spleen is..

The largest single mass of lymphoid tissue

5

Location of the spleen

Lies in the left hypochondrium between the fundus of the stomach and diaphragm

The interomedial surface touches the stomach, left kidney, pancreas, and splenic flexure

6

The spleen is covered by a protective capsule except for..

the hilum where the vascular structures and lymph nodes are located

7

Ligaments

Splenorenal- attaches the spleen to the stomach and kidney; in contact with the posterior peritoneal wall, phreniocolic ligament, and gatrosplenic ligament

Gastrosplenic- composed of the two layers of the dorsal mesentery that separates the lesser sac posteriorly from the greater sac

8

Size of the spleen

Adult spleen:

8-13 cm in length

7 cm wide

3-4 cm thick

Decreases with age

Varies with nutritional status of the body

9

The spleen receives blood from

the splenic artery; travels horizontally along the superior border of the pancreas

After entering the hilum, the splenic artery branches into 6 smaller arteries

10

Splenic vein

Formed by multiple branches with in the spleen

Leaves the hilum to join the superior mesenteric vein to form the main portal vein

Travels along posteromedial border of the pancreas

11

What ligaments hold the spleen in place?

lienorenal, gastrosplenic, and phrenocolic ligaments

12

What causes the spleen to be displaced inferiorly?

A mass in the LUQ

13

Caudal displacement

Occurs secondary to a subclavian abscess, splenic cyst, or left pleural effusion

14

Cephalic displacement

Results from volume loss in left lung, left lobe pneumonia, paralysis of the left hemidiaphragm, or large intrabdominal mass

15

What is wandering spleen?

Embryologic anomaly

Results when the dorsal mesentery fails to fuse with the posterior peritoneum without supporting ligaments of the spleen

Patients may have an abdominal or pelvic mass, intermittent pain, and volvulus (splenic torsion)

16

Functional Characteristic of the Spleen

Maturation of the surface of erythrocytes

Reservoir

Culling

Pitting function

Disposal of senescent or abnormal erythrocytes

Functions related to platelet and leukocyte life span

17

Describe the location of the spleen in relation to the left kidney

anterior and superior

18

common location of accessory spleen

Splenic Hilum usually about 1cm -can enlarge like the rest of spleen

19

sonographic signs of histoplasmosis

echogenic areas -"starry night" appearance

20

major focal defects

◦Tumor (benign and malignant)

◦Infarction

◦Abscess

◦Cyst

21

splenic rupture

related to some sort of trauma or splenomegaly spleen is removed when this happens

22

subcapsular splenic rupture

spleen ruptures within the surrounding capsule that contains all of the blood

23

wandering spleen

a spleen that is not held in place because the stabilizing ligaments failed to develop or were not attached

24

a spleen is considered enlarged (splenomegaly) when is measures...?

>13cm

25

primary tumors that may metastasize to the Spleen

breast, lung, ovary, prostate, colon, kidney and melenoma

26

polycythemia vera

polycythemia: excess of red blood cells polycythemia vera:is a chronic disease of unknown cause that involves all bone marrow elements

27

erythropoeisis

red blood cell production

28

Red pulp

large number of red blood cells, fills remaining area of spleen

29

White pulp

tiny islands throughout spleen, contains lymphocytes, marphygian corpuscles

30

Pitting

removes nuclei from red blood cells