How many segments do vertebral arteries have?

How many segments do vertebral arteries have?

• A. Two segments
• B. Three segments
• C. Four segments
• D. Five segments

Answer: (C)

The vertebral arteries, which supply blood to the brain and upper spinal cord, are typically described as having four distinct segments. These segments are as follows: 1. **V4 segment** - This is the part of the vertebral artery that is located within the cranium and enters the skull through the foramen magnum. 2. **V3 segment** - This segment runs through the transverse foramina of the cervical vertebrae. 3. **V2 segment** - Located between the V1 and V3 segments, it runs along the pre-vertebral space and typically includes the segment that traverses from the shoulder area upward towards the neck. 4. **V1 segment** - This is the segment that extends from the origin of the vertebral artery at the subclavian artery to the level of the foramen transversarium of the C6 vertebra. Understanding these segments is crucial for vascular reading and assessment, as identifying issues within any of these segments can have significant clinical implications.

The vertebral arteries, which supply blood to the brain and upper spinal cord, are typically described as having four distinct segments. These segments are as follows:

1. V4 segment - This is the part of the vertebral artery that is located within the cranium and enters the skull through the foramen magnum.

2. V3 segment - This segment runs through the transverse foramina of the cervical vertebrae.

3. V2 segment - Located between the V1 and V3 segments, it runs along the pre-vertebral space and typically includes the segment that traverses from the shoulder area upward towards the neck.

4. V1 segment - This is the segment that extends from the origin of the vertebral artery at the subclavian artery to the level of the foramen transversarium of the C6 vertebra.

Understanding these segments is crucial for vascular reading and assessment, as identifying issues within any of these segments can have significant clinical implications.