L8; Blood Supply Of Cerebrum Flashcards
Branches of the internal carotid artery
- Hypophyseal artery
- Ophthalmic artery
- Posterior communicating artery
- Anterior Choroid/ satellite artery of the optic tract
TERMINAL BRANCHES: - Anterior Cerebral Artery
- Middle Cerebral Artery
Parts of the vertebral artery and its origin
Origin; branch of subclavian
- In scalenovertebral triangle till the transverse foramen of C6.
- In transverse foramen of upper 6 C vertebrae
- In sub occipital triangle; enters skull thru foramen magnum, ascend medulla oblongata along rootlets of HYPOGLOSSAL nerve between pyramid and olive.
Branches of vertebral artery
-2 ANTERIOR spinal arteries;
join together to form a single artery that descends in ANTERIOR MEDIAN FISSURE.
-2 POSTERIOR SPINAL ARTERIES;
remain separate and descend thru posterolatersl sulcus.
- Meningeal branches
- Branches to medulla
- PICA; passes thru vermis of cerebellum to supply med ob and cerebellum.
Basilar artery formed by union of
2 vertebral arteries @ j(x) of medulla and pons and ascend in basilar sulcus.
Branches of basilar artery
- AICA: supplies cerebellum and posterolateral pons
- Pontine branches: supply basilar part of pons
- Superior cerebellar artery
- 2 POSTERIOR CEREBRAL ARTERIES
Clinical significance of 1. Posterior cerebral and 2. Superior cerebellar arteries
Close to midbrain can therefore compress occulomotor, trochlear in case of aneurysm.
Connection of posterior cerebral to internal carotid
Posterior communicating artery
Rupture of cerebral arteries results in
Subarachnoid bleed eg. Beery aneurysm (weakest at junctions)
Rupture of meningeal arteries
Extradural bleeding; eg middle meningeal artery and compress motor cortex
Rupture of bridging veins
SUBDURAL bleed
Clinical significance of superior sagittal sinus
Grey matter shrinks as you age there4 more space that stretches the sinus there4 more likely to rupture
Middle cerebral artery supplies
Superolateral surface
Orbital part inferiority
Temporal lobe
‘Motor speech area’
Frontal eye fieldv(MFG)
Anterior cerebral artery supplies
Medial surface
Small strip in superolateral surface—>’motor sensory of lower limbs’
Medial of inferior part
Posterior cerebral artery supplies
Occipital lobe
Termporal gyrus
Termporal and occipital inferiorly
Venous drainage of brain
- Superior cerebral veins
- Superficial middle cerebral vein
- Inferior cerebral vein
- Internal cerebral vein (union of thalamostriate and choroid veins)
- Basal veins (union of anterior cerebral vein, deep middle cerebral vein & striate veins)
- Great cerebral vein of Galen (union of 2 internal cerebral veins)
