posterior fossa cisterns presentation

1. POSTERIOR FOSSA CISTERNS

2. INTRODUCTION
• The subarachnoid space, expands at the base of the brain , to form
compartments filled CSF
• Numerous trabeculae, septa, and membranes cross the space
• divide the subarachnoid space into smaller compartments
• the cranial nerves and major intracranial arteries and veins pass
through
• natural pathway through which most operations for intracranial
aneurysms, extra axial brain tumors

3. Unpaired cisterns
1. Interpeduncular cistern
2. Prepontine cistern
3. Premedullary cistern
4. Quadrigeminal cistern
5. Cisterna magna
Paired cisterns
1. Cerebellopontine cistern
2. Cerebellomedullary cistern

4. ARACHNOID MEMBRANES
• Liliequist's membrane - separates chiasmatic and interpeduncular
cisterns
• Anterior pontine membrane - prepontine and cerebellopontine
cisterns
• Lateral pontomesencephalic membrane - ambient and
cerebellopontine cisterns
• Medial pontomedullary membrane - premedullary and prepontine
cisterns
• Lateral pontomedullary membrane - cerebellopontine and
cerebellomedullary cisterns