Unit 2: Anatomy and collaterals

Question 1

Answer 1

A. ECA

B. ICA

C. CCA

D. AORTA

E. SCA

F. ITA

G. THYROCERVICAL TRUNK

H. VERT A.

Question 2

What is a bovine arch?

Answer 2

Left CCA comes of the BCA

Question 3

What divides the ICA and the ECA?

Answer 3

Flow divider.

Question 4

What are the characterisitics of the ICA?

Answer 4

Lateral.

Larger (bulb).

No branches.

Question 5

What are the characterisitics of the ECA?

Answer 5

Medial.

Smaller.

Branches.

Question 6

What is the distance from the FD to the proximal ICA?

Answer 6

0-1.5 cm

Question 7

WHat is the distance of the FD from the mid ICA?

Answer 7

1.5-3 cm

Question 8

What is the distance from the FD to the distal ICA?

Answer 8

>3 cm

Question 9

WHat are the 3 opthalmic end arteries?

Answer 9

1. Supraorbital
2. Frontal
3. Nasal

Question 10

What are the proximal ECA branches?

Answer 10

• Superior thyroid- 1st branch
• Linguinal
• Facial
• Occipital
• Maxillary
• Superficial temporal.

Question 11

What is the first branch of the subclavian artery?

Answer 11

Vertebral artery.

It arises anteriorly and courses into the vertebral processes.

Question 12

What is the second branch off the subclavian artery?

Answer 12

Thyrocervical trunk.

It arises anteriorly and courses medially.

Question 13

What is the third branch of the subclavian artery?

Answer 13

Costocervical trunk.

It arises anteriorly.

Question 14

What courses inferiorly off the proximal subclavian artery?

Answer 14

Internal thoracic artery.

Question 15

What does the vertebral arteryies run through?

Answer 15

They run through the spinal processes and parallel to the common carotid.

Question 16

What is the only artery in the body formed by two arteries joining?

Answer 16

Basiliar artery.

Question 17

What feeds the ICA if there is an an CCA occlusion?

Answer 17

Retrograde ECA flow feeds the ICA.

Question 18

What feeds the ICA if there is an ICA occlusion?

Answer 18

Ipsilateral ECA branches (facial, STA) feed distal branches of the ophthalmic artery which then reverse to feed the ICA.

Question 19

What feeds the arm if there is an Proximal SCA occlusion?

Answer 19

Ipsilateral vertebral flow reverses to feed the arm. ( “subclavian steal”)

Question 20

What feeds the CCA and distal SCA if there is a BCA occlusion?

Answer 20

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.