2025年1月4日 · The vertebral artery is typically divided into 4 segments: Also known as the extraosseous segment, V1 arises from the first part of the subclavian artery. It angles posteriorly between longus colli medially and scalenus anterior laterally, through the colliscalene triangle, and behind the common carotid artery to enter the transverse foramen of C6.

The fourth segment (V4), known as the intracranial segment, is defined from where the artery pierces the dura mater at the foramen magnum to where it joins with the contralateral vertebral artery to form the basilar artery [4, 16].

The V4 segment extends intracranially along the inferior portion of the pons and joins the contralateral V.A. to form the basilar artery. The anterior spinal communicator arteries originate from this segment, join in the midline, and form the anterior spinal artery.

2023年11月3日 · There are four segments of the vertebral artery, following its way through the neck; preforaminal, foraminal, extradural (atlantic), and intradural (intracranial) parts.

To determine the morphometry of the vertebral artery (VA) with emphasis on the fourth segment (V4) and its variations using computed tomography angiogram (CTA).

2024年5月1日 · The V4 segment also known as the intradural segment of the VA, runs upward and inward from where it enters through the dural foramen until it meets the opposite vertebral artery to form the basilar artery (BA) in front of the pontomedullary sulcus.

2021年7月23日 · What are the vertebral artery segments? The vertebral arteries divide into four segments based on where they are within the spinal column: V1 (pre-foraminal) arises from the subclavian artery. It runs behind the carotid artery, which is also in the neck. V2 (foraminal) travels alongside vertebral veins and nerves.

The V3 segment traverses the transverse foramen of C2 and terminates as the artery pierces the posterior atlanto-occipital membrane. The V4 segment is demarcated by the atlanto-occipital membrane and where the artery finally enters the foramen magnum at the base of the skull.

· The fourth segment (V4) -segment courses upward to join the other vertebral artery to form the basilar artery; Only the fourth segment gives rise to branches that perfuse the brainstem and cerebellum. Course of verebral artery.

2006年5月3日 · Intracranial vertebral artery (VA) dissection has three clinical presentations: ischemia, hemorrhage, and mass effect. Imaging findings of intracranial VA dissections vary according to clinical presentation.