Chapter 6 LAB Flashcards
Be able to identify the Anterior and Posterior Circulations
What arteries make up the Posterior Circulation?
The Vertebral-Basilar system, which consists of:
1) Vertberal Arteries
2) Anterior Spinal
3) Posterior Cerebral Arteries
4) Posterior Inferior Cerebellar Artery
5) Posterior Cerebral
6) Superior Cerebellar
7) Anterior Inferior Cerebellar
What structure does the vertebral artery supply?
Posterior Circulation to CNS structures (spinal cord, brainstem, cerebellum, cerebrum)
What structure(s) does the anterior spinal artery supply?
Anterior/medial medulla and anterior spinal cord
What structure does the posterior inferior cerebellar artery supply?
Cerebellum and lateral portion of the medulla; spinal cord via posterior spinal artery
What structure does the basilar artery supply?
Basal pons; entire brainstem superior to the medulla
What structure does the anterior inferior cerebellar artery supply?
Cerebellum (middle cerebellar peduncle, tonsil, and part of the posterior lobe) and tegmentum of the pons (posterior to the pons)
What structure does the superior cerebellar artery supply?
Cerebellum (anterior lobe and superior cerebellar peduncle); midbrain
What structure does the posterior cerebral artery supply?
midbrain; medial parts of the temporal lobe and entire occipital lobe
What arteries make up the circle of willis?
1) Anterior cerebral artery
2) Anterior communicating artery
3) Internal Charotid Artery (part of it)
4) Posterior Cerebral Artery
5) Posterior Communicating Artery
Describe the Middle Cerebral Arteries
Located within the lateral fissure
Supply most of the lateral hemispheres of the cerebrum
Describe the anterior cerebral arteries (where they lie, what they do).
Course along and supply the anterior and medial surface of the cerebral hemispheres
They branch from the internal charotid arteries.
Describe the posterior cerebral artery (PCA)
course along the supero-lateral margin of the midbrain
Supply midbrain, medial portions of the temporal lobe and the occipital lobe.
What do cerebral veins do and where do they empy?
Collect blood from the capillaries and drain into a series of veins called the superficial and deep cerebral vein. These then drain into the dural venous sinuses.
Where do superficial cerebral veins lie?
In the subarachnoid space along thhe surface of the cerebrum
Where do superficial veins drain into?
The dural venous sinuses; paticularly the superior sagittal sinus
What are thhe deep cerebral veins?
1) Internal Cerebral Vein
2) Great Cerebral Vein (of Galen)
What does the internal cerebral vein drain?
Drains the thalamus and other deeper cortical structures
Where does the Great Cerebral Vein of Galen drain into?
Drains into the straight sinus
Where does the Great Cerebral Vein (of Galen) lie?
Inferior to the caudal portion of the corpus callosum and superior to the cerebellum on the midline
What is the falx cerebri?
Sheet of dura that separates the two hemispheres of the brain
What is the tentorium cerebelli?
Sheet of dura that separates the occipital lobes from the cerebellar lobes.
Identify the ventricular system and label its parts
What is non-communicating hydrocephalus?
Results from the blockage of portions of the ventricular system
