Lecture 10/7: Spinal Arterial Circulation Flashcards
Test 2
How many arteries run longwise on the spine? What are they called?
3 total
2 posterior spine A
1 anterior spine A
What do the posterior spinal artieries feed into?
Vertebral arteries
Arterior inferior cerebellar arteries
posterior inferior cerebellar arteries
Where are the posterior arteries located?
L/R sides of the posterior sulcus
How much blood flow to the cord are the posterior spinal arteries reposible for?
25%
12.5% each
Compare the anterior median fissure to the posterior median sulcus
Anterior median fissure is much larger/wider and able to hold a larger artery
How much blood flow to the cord is the anterior artery reposible for?
75%
What artery feeds into the anterior and posterior spinal arteries?
Radicular arteries
Where does radicular arteries get blood from?
Intercostal arteries
What are the interchangeable names for radicular arteries?
Segmental Arteries
Medullary Arteries
Radicular Arteries
What are the Coronal Arteries?
“Crown” = Coronal
On the outer surface of the cord, similar to collateral circulation but NOT LIKE CIRCLE OF WILLIS not not accommodate for blockage
How many anterior radicular Arteries do you have in the C-spine?
2
How many anterior radicular Arteries do you have in the T-spine?
2-3
How many anterior radicular Arteries do you have in the L-spine?
1-2
T/F: You will have at least 1 radicular artery at level level of the spine
F
They are irregular
You will have 1 on the L or R or Front or Back every few levels and it varies per person
Where there are arteries there are likely________
veins
How many spinal veins do we have longwise?
4
3 posterior (1 is midline)
1 anterior
You have a ________ at every level of the spine
Spinal branch
Describe the spinal branch
They are at every level in the spine but they branch off in different way around the ribs
Where is the spinal branch?
Sits on top of the dorsal root ganglia
What feeds all the spinal arteries associated with the ribcage?
Thoracic Aorta
What do the Mesenteric Arteries supply blood to?
Small intestines
What are the 2 parts of the aorta?
Thoracic aorta
Abdominal aorta
What do the intercostal arteries do?
Keeps ribcage healthy & perfused
Where do you clamp when you have an aortic aneurysm?
Right above it
What is the source of blood for ALL the radicular arteries?
Aorta
What happens you clamp the cord to repair an aneurysm?
Cuts off circulation to the radicular arteries in spine
Can lead to death of neurons in the cord
What artery supplies a majority of blood to the cord?
Great radicular artery
What is another name for the Great radiculary artery?
Artery of adamkiewicz
GRA