Spleen
An abnormally low level of WBCs is referred to as ______.
Leukopenia
In the embryo, the spleen is formed from the
mesoderm
When scanning for the spleen, the sonographer should be mindful that the
normal spleen may be very small and is located deep to the rib cage
What is the thin translucent membrane that lines the walls of the abdominal cavity and covers the abdominal organs?
peritoneal membrane
The most common use of sonography in the evaluation of the spleen is to identify
splenomegaly
The smooth surfaces of the spleen are to due to contact with
the inferior surface of the diaphragm
Average measurements of the spleen are:
12cm in length 7cm in width 3-4cm in thickness
Venous sinuses in the spleen are capable of storing ___________ of blood.
300 mL
The thickness of the normal bowel wall when the bowel is non-distended is approximately
5mm
What is the role of the spleen in the formation of bile?
Erythorcyte destruction creates the byproduct of heme (bilirubin)which is used by the liver in the formation of bile.
The spleen is an intraperitoneal or a retroperitoneal organ?
Inrtaperitoneal
What is the correct relationship of the left kidney and the spleen?
The spleen is superior, lateral and posterior to the left kidney.
T or F The elastic properties of splenic tissue allow the spleen to enlarge and contract.
True
T or F The spleen has a convex superior surface and a concave inferior surface
True
T or F The spleen is a highly vascular organ
True
What are the cords of Billroth?
a meshwork of blood-filled venous sinuses and reticular splenic cords
When scanning the spleen, the sonographer notices a small round structure near the splenic hilum. The echotexture of this structure is exactly the same as the spleen. This is most likely
a splenule
The stomach is located ___________ to the spleen.
anteromedial
Where are the subphrenic spaces located?
between the diaphragm and liver or spleen
The volume of the normal spleen may increase with
digestion
A ligament that helps stabilize the spleen is the
gastrosplenic
Another name for the splenorenal ligament is
lienorenal ligament
The spleen is composed primarily of
lymph tissue
The white pulp of the spleen consists of
lymphocyte nodules
What cells of the spleen turns heme into unconjugated bilirubin?
macrophages
Where is the lesser sac of the peritoneal cavity located?
posterior to the stomach and left lobe of the liver
In the embryo and fetus, the spleen
produces white and red blood cells.
RBC's are filtered in what portion of the spleen?
red pulp
What is located both posterior and lateral to the spleen?
ribs and intercostal spaces
The sonographer obtains a splenic length of 5.0cm. This measurement indicates that the spleen is
smaller than normal
What vessel courses along the superior border of the pancreas?
splenic artery
A WBC count reveals leukocytosis. This means that there are
too many white blood cells
T or F All of the following are detectable with sonographic imaging: ~inguinal hernia ~pyloric stenosis in an infant ~fluid in Morison's pouch ~Crohn's disease and other bowel inflammatory conditions ~paracolic gutter fluid
true
The lymphoid tissues of the spleen are found in the
white pulp
Malphigian corpuscles are found in the
white pulp of the spleen
With the patient in the supine position and during the Overview scan portion of the complete abdominal sonogram, the sonographer should be able to determine the (5)
~impact of bowel gas on imaging the abdominal organs ~presence of free fluid in the dependent portions of the abdomen ~general size and location of the gallbladder ~size of the liver ~location and number of kidneys
spaces are located in the peritoneal cavity? (4)
~left colic gutter ~right colic space ~suphepatic space ~left subphrenic space