3. Venous drainage of the CNS Flashcards
Name the constituents of the DORSAL system of sinuses
- Dorsal sagittal sinus
- Straight sinus
- Transverse sinuses (L+R)
Name the constituents of the VENTRAL system of sinuses
- Cavernous sinus
- Petrosal sinuses (dorsal + ventral)
Name the CONNECTING sinuses
- Temporal + sigmoid sinuses
DORSAL SAGITTAL SINSUS
1. Localization
2. Drainage
- Dorsal aspect of the falx (whole length)
- Dorsal cerebral veins + most diploic veins
STRAIGHT sinus
1. Localization
2. Drainage
- Caudoventral aspect of the falx
- Great cerebral vein into the caudal part of dorsal sagittal sinus
TRANSVERSE sinuses
1. Localization
2. Drainage
- R+L sinuses join along dorsal midline
- Drain dorsal sagittal + straight sinuses into the temporal and sigmoid sinuses
CAVERNOUS sinus (paired L/R)
- what are its 3 connections?
- To ophtalmic plexus rostrally
- To maxillary vein laterally
- To other cavernous sinus medially, via intercavernous sinuses
PETROSAL sinus - what are the roles of the dorsal vs ventral
DORSAL petrosal sinus:
- Drains ventral cerebral vein
VENTRAL petrosal sinus
- Joins the cavernous to the sigmoid (connecting) sinus
- Burried in the bony petro-occipital canal
TEMPORAL & SIGMOID (connecting) sinuses
Drain what via what?
Drain both
- DORSAL sytem via transverse sinuses
- VENTRAL system via petrosal sinuses
Connect directly with the spinal system of sinuses
Role of the veins of the brain
Drain cranial system of sinuses into the systemic circulation
4 particularities of the veins of the brain
- No valve
- No smooth mucle (thin)
- Lots of anastomosis
- Not satellite to arteries
Name the veins of the brain (cerebral, cerebellar, caudal brainstem)
CEREBRAL VEINS
- Superficial: Dorsal/ventral cerebral veins
- Deep: Great cerebral vein
CEREBELLAR VEINS
- Dorsal/ventral cerebellar veins
CAUDAL MEDULLA
- Medullary veins
- Pontine veins
None of the veins are satellite to arteries, except
Caudal medulla
DORSAL CEREBRAL veins
1. Drain what?
2. Lie where?
3. First four project to…
- Dorsal system of sinuses
- In the sulci
- Dorsal sagittal sinus
VENTRAL CEREBRAL veins
1. Drain what?
2. Project where?
- Ventral system of sinuses
- ## Dorsal petrosal sinus
DEEP cerebral veins
1. All drain into…
- Great cereberal vein
DORSAL cerebellar vein project to
A corresponding transverse sinus
VENTRAL cerebellar vein drains into
Sigmoid and basilar sinuses
Summary slide 52
What is the main component of the venous drainage to the spinal cord?
Longitudinal sinuses
Describe the LONGITUDINAL SINUSES of the spinal cord
- Pair of 2 parallel sinuses
- Run along entire lenght of spinal cord, on ventral floor
- Diverge over i-v disc
- Converge mid-vertebral body where they occasionally anastomose
What veins drain the longitudinal spinal sinuses into the systemic circulation?
Intervertebral veins
Where do the INTERVERTEBRAL veins drain ?
Run parallel to nerve roots, escape canal through intervertebral foramina, then empty into:
- VERTEBRAL veins (C spine)
- AZYGOS vein (T spine)
- CAUDAL VENA CAVA (L spine)
Which veins could be accidentally punctured during CSF collection in the AO junction?
Interarcuate veins
What is the role of the INTERARCUATE veins
Join longitudinal spinal sinuses with a dorsal external venous plexus
What is the role of the BASIVERTEBRAL veins
Join the two longitudinal spinal sinuses together and drain the vertebral bodies
