• Ischemia
  • In the setting of increased resistance in the proximal subclavian artery, blood may flow backward away from the heart along the ITA, causing myocardial ischemia due to coronary steal. (wikipedia.org)
  • If one part of the circle becomes blocked or narrowed (stenosed) or one of the arteries supplying the circle is blocked or narrowed, blood flow from the other blood vessels can often preserve the cerebral perfusion well enough to avoid the symptoms of ischemia. (wikipedia.org)
  • contralateral
  • citation needed] The vertigo due to VBI can be brought on by head turning, which could occlude the contralateral vertebral artery and result in decreased blood flow to the brain if the contralateral artery is occluded. (wikipedia.org)
  • As a result, blood travels up one of the other blood vessels to the brain (the other vertebral or the carotids), reaches the basilar artery or goes around the cerebral arterial circle and descends via the (contralateral) vertebral artery to the subclavian (with the proximal blockage) and feeds blood to the distal subclavian artery (which supplies the upper limb and shoulder). (wikipedia.org)
  • neck
  • Extreme motions of the head and neck, can injure vertebral arteries, resulting in vertebrobasilar artery strokes & brain damage. (denverback.com)
  • Behind it are the transverse process of the seventh cervical vertebra, the sympathetic trunk and its inferior cervical ganglion The second (foraminal) part runs upward through the foramina in the transverse processes of the C6 to C2 vertebræ, and is surrounded by branches from the inferior cervical sympathetic ganglion and by a plexus of veins which unite to form the vertebral vein at the lower part of the neck. (wikipedia.org)
  • inferior
  • The posterior inferior cerebellar artery frequently develops differently, however, emerging as a branch of the VA before the formation of the basilar artery. (chirotexas.org)
  • This part of the artery is covered by the Semispinalis capitis and is contained in the suboccipital triangle-a triangular space bounded by the Rectus capitis posterior major, the Obliquus superior, and the Obliquus inferior. (wikipedia.org)
  • Two or three paired long circumferential branches: the internal auditory or labyrinthine artery, which may arise directly from the basilar artery in about 15% of people, but more commonly as a branch from: the anterior inferior cerebellar artery (supplying the inferior and middle cerebellar peduncles of the cerebellum) and the adjacent hemisphere). (wikipedia.org)
  • distal
  • As a result of this procedure, the distal end of the ITA is diverted to one of the coronary arteries (typically the LAD), facilitating blood supply to the heart. (wikipedia.org)
  • brain
  • The tumor may encase the vertebral, basilar, and their perforating arteries and cranial nerves, may invade bony structures of the craniocervical junction, or may be densely adherent to the brain stem. (c3.hu)
  • If high enough, this pressure leads to compression of both the arteries and veins, thus reducing the amount of arterial blood that can reach the brain and the amount of venous blood that can leave it. (medscape.com)
  • Vertebrobasilar circulatory disorders are conditions in which blood supply to the back of the brain is disrupted. (drugs.com)
  • The areas in the back of the brain that receive blood from these arteries are needed to keep a person alive. (drugs.com)
  • Normally, blood flows from the aorta into the subclavian artery, and then some of that blood leaves via the vertebral artery to supply the brain. (wikipedia.org)
  • The basilar artery is the main blood supply to the brainstem and connects to the Circle of Willis to potentially supply the rest of the brain if there is compromise to one of the carotids. (wikipedia.org)
  • In human anatomy, the basilar artery is one of the arteries that supplies the brain with oxygen-rich blood. (wikipedia.org)
  • cranial
  • Direct cranial nerve compression can lead to isolated cranial nerve dysfunction, usually associated with a normal-sized basilar artery that is tortuous and elongated. (wikipedia.org)
  • Multiple cranial nerve dysfunction is far more likely to occur if there is dilation (ectasia) associated with a tortuous and elongated basilar artery. (wikipedia.org)
  • foramen
  • Once they have passed through the transverse foramen of C1 (also known as the atlas), the vertebral arteries travel across the posterior arch of C1 and through the suboccipital triangle[citation needed] before entering the foramen magnum. (wikipedia.org)
  • branches
  • Its branches can be divided into two groups: Paramedian perforating arteries arising either directly from the dorsal surface or from short circumferential arteries running around and into the pons supplying the corticospinal tracts and vital deep nuclei. (wikipedia.org)
  • All arteries involved give off cortical and central branches. (wikipedia.org)
  • blood flow
  • Vertigo, the sensation of spinning even while a person is still, is the most recognizable and quite often the sole symptom of decreased blood flow in the vertebrobasilar distribution. (wikipedia.org)
  • After the tear, blood enters the arterial wall and forms a blood clot, thickening the artery wall and often impeding blood flow. (wikipedia.org)