Vasculature Flashcards
Which vessel is responsible for an extradural haematoma?
middle meningeal arteries
Which vessel is responsible for a sub dural haematoma?
cerebral bridging veins
Which vessel is responsible for a sub-arachnoid haematoma?
Cerebral arteries
Which three longitudinal arterial vessels run the length of the spinal cord?
- singleanterior spinal artery
2. pairedposterior spinal arteries
Where does the anterior spinal artery arise?
- in a Y-shaped configuration from the two vertebral arteries at the level of the medulla oblongata
2, descends along the ventral surface of the cord in the midline
When do the posterior spinal arteries arise?
- from either the vertebral arteries
- or the posterior inferior cerebellar arteries
- run caudally on the posterolateral surface of the cord
How much do the anterior and posterior spinal arteries supple?
insufficient to supply the cord below cervical levels
Where do the anterior and posterior spinal arteries receive reinforcement from?
- anastomosis withradicular arteriesderived from segmental vessels, including:
1. the ascending cervical
2. intercostal
3. lumbar arteries
How do the radicular arteries travel?
- pass through the intervertebral foramina
- divide into anterior and posterior branches
- which run with the dorsal and ventral spinal nerve roots, respectively
Where does the great radicular artery arise from?
lateral intercostal or lumbar artery at any level between T8 and L3
Where is the blood supply of the spinal cord most vulnerable?
- thoracic region
- in the anterior portion of the cord
What does occlusion of the anterior spinal artery, usually secondary to. dissection of the descending thoracic aorta lead to?
- acute thoracic cord syndrome
2. with paraplegia and incontinence
Which tracts are affected in occlusion of the anterior spinal artery?
- spinothalamic modalities of pain and temperature are preferentially lost
- The proprioceptive functions of the dorsal columns are relatively preserved
What is the venous drainage of the spinal cord like?
follows a basically similar pattern to the arterial supply
How many venous channels exist?
six longitudinal
What are these venous cahnnels?
- anteriorandposterior spinal veins(run in the midline)
- bilaterally pairedanterolateralandposterolateral veinsare situated near the lines of attachment of the ventral and dorsal nerve roots, respectively.
How do these vessels drain?
viaanteriorandposterior radicular veinsinto theinternal vertebral venous plexus(epidural venous plexus)
Where is the internal vertebral venous plexus?
between the dura mater and the vertebral periosteum
What does the internal venous plexus communicate with?
- anexternal vertebral venous plexus
- thence with the ascending lumbar veins, the azygos and hemiazygos veins
What are the two main vessels that supply the brain?
- internal carotid arteries
- vertebral arteries
Where does the internal carotid artery arise from?
common carotid artery
How does the internal carotid artery enter the middle fossa of the cranial cavity?
through the carotid canal
What is the course of the internal carotid artery?
- follows a series of characteristic bends: thecarotid syphon
- passes forwards through the cavernous sinus
- then upwards on the medial aspect of the anterior clinoid process
- reaching the surface of the brain lateral to the optic chiasm
What does the internal carotid. artery do along its course?
gives rise to a number of pre-terminal branches