Vertebral Atery Flashcards
1
Q
Origin
A
From upper and posterior aspects of 1st part subclavian artery
2
Q
Parts
A
4 parts
3
Q
1st part
A
- Extends from subclavian artery till C6 foramen transversarium
- Lies in inverted V-shaped space medial to scalenus anterior (vertebral triangle)
- It lies between
- In front: inferior thyroid artery and carotid sheath
- Behind: inferior cervical sympathetic ganglion C7 and C8 nerves
4
Q
2nd part
A
Ascends in foramina transversaria of upper 6 cervical vertebrae surrounded by plexus of veins and sympathetic plexus of nerves
5
Q
2nd part branches
A
Spinal branches to spinal cord and meninges
6
Q
3rd part
A
Lies in suboccipital triangle grooving upper surface of atlas posterior arch
7
Q
3rd part branches
A
Muscular branches to suboccipital triangle muscles
8
Q
4th part
A
Enters cranial cavity via foramen magnum where both arteries unite at pons Lower border forming basilar artery
9
Q
4th part branches
A
- Anterior spinal artery
- Posterior spinal artery
- Posterior inferior cerebellar artery
