Unit 2: Anatomy and collaterals Flashcards
A. ECA
B. ICA
C. CCA
D. AORTA
E. SCA
F. ITA
G. THYROCERVICAL TRUNK
H. VERT A.
What is a bovine arch?
Left CCA comes of the BCA
What divides the ICA and the ECA?
Flow divider.
What are the characterisitics of the ICA?
Lateral.
Larger (bulb).
No branches.
What are the characterisitics of the ECA?
Medial.
Smaller.
Branches.
What is the distance from the FD to the proximal ICA?
0-1.5 cm
WHat is the distance of the FD from the mid ICA?
1.5-3 cm
What is the distance from the FD to the distal ICA?
>3 cm
WHat are the 3 opthalmic end arteries?
- Supraorbital
- Frontal
- Nasal
What are the proximal ECA branches?
- Superior thyroid- 1st branch
- Linguinal
- Facial
- Occipital
- Maxillary
- Superficial temporal.
What is the first branch of the subclavian artery?
Vertebral artery.
It arises anteriorly and courses into the vertebral processes.
What is the second branch off the subclavian artery?
Thyrocervical trunk.
It arises anteriorly and courses medially.
What is the third branch of the subclavian artery?
Costocervical trunk.
It arises anteriorly.
What courses inferiorly off the proximal subclavian artery?
Internal thoracic artery.
What does the vertebral arteryies run through?
They run through the spinal processes and parallel to the common carotid.
What is the only artery in the body formed by two arteries joining?
Basiliar artery.
What feeds the ICA if there is an an CCA occlusion?
Retrograde ECA flow feeds the ICA.
What feeds the ICA if there is an ICA occlusion?
Ipsilateral ECA branches (facial, STA) feed distal branches of the ophthalmic artery which then reverse to feed the ICA.
What feeds the arm if there is an Proximal SCA occlusion?
Ipsilateral vertebral flow reverses to feed the arm. ( “subclavian steal”)
What feeds the CCA and distal SCA if there is a BCA occlusion?
Flow can reverse in the vertebraland/or other branches off the proximal SCA to feed the distal SCA.
That flow can reverse in the roximal SCA to feed the CCA.
