Cerebrovascular Anatomy Flashcards
What does the RT CCA arise from?
innominate artery
What does teh LT CCA arise from?
2nd branch of aortic arch
What is the dilatation proximal to the bifurcation of the CCA?
carotid bulb
What does the CCA bifurcate into?
ICA & ECA
What is the 1st branch of the ICA?
ophthalmic artery
Where does the ICA terminate?
circle of willis
What feeds the middle cerebral artery?
ICA
What type of flow does the ICA have?
low resistant
How many branches does the ECA have?
8
What are the branches of the ECA?
- superior thyroid
- ascending pharyngeal
- lingual
- facial
- occipital
- posterior auricular
- superficial temporal
- maxillary
What does the ECA supply?
face, neck, scalp
What type of flow does the ECA have?
high resistant
What does the vertebral a arise from?
subclavian
Where does the vertebral artery travel?
superiorly along cervical spine entering the foramen magnum
What does the vertebral artery unite to form?
basilar artery
What is the circle of willis?
intracranial communication of vessels that connect anterior and posterior circulation systems of the brain
What does the circle of willis provide?
collateral pathways to maintain flow in presence of stenosis or occlusion
What are the arteries in the circle of willis?
- anterior cerebral
- anterior communicating
- middle cerebral
- posterior communicating
- posterior cerebral
- internal carotid
- basilar
What are the differences of the ICA and ECA?
ICA:
-larger
-no branches
-posterior/lateral
-low resistant
ECA:
-smaller
-8 branches
-anterior/medial
-high resistant
-temporal tap
What is the pt position for carotid exam?
supine
What is the carotid exam protcol?
- trans cca
- trans bulb
- trans bifur
- long cca- 2d, color, doppler
- long bulb- 2d, color
- long ica- 2d, color, doppler (prox, mid, dist)
- long eca- 2d, color, doppler
- long vert- 2d, color, doppler
- subclavian- 2d, color, doppler
What is the name of flow reversal in the carotid bulb?
Eddy current
What may hinder color filling in a carotid exam?
dense, calcified plaque
What type of flow do the vertebrals have?
low resistant
What type of flow do the subclavians have?
high resistant
