Figure 7

(A) Overview of the complete organization of the arachnoid membrane groups at the level of the tentorium, posterior fossa and the craniovertebral junction (AP view). (B) The complex relations of the tentorial and clival membrane group at the level of the tentorial edge. (C) Axial view of the relations of the neurovascular structures to the inner membranes at the level of the craniovertebral junction. Left side of the drawing: the level of the C1 spinal nerve. Rigth side: level of the C2 spinal nerve.

AICA=anterior inferior cerebellar artery, APM=anterior pontine membrane, ASA=anterior spinal artery, C1 root=C1 spinal nerve, C2 root=C2 spinal nerve, CNIII=oculomotor nerve, CNIV=trochlear nerve, CNV=trigeminal nerve, CNVI=abducent nerve, CNVII-VIII=vestibulocochlear and facial nerves, CNIX=glossopharyngeal nerve, CNX=vagal nerve, CNXI=accessory nerve, CNXII=hypoglossal nerve, ex.=exit, ins.=insertion, LD=denticulate ligament, LMM=lateral mesencephalic membrane, LM-ML=mesencephalic leaf of the Liliequist’s membrane complex, OA=outer arachnoid, PCA=posterior cerebral artery, PCM=posterior cerebral membrane, PICA=posterior inferior cerebellar artery, PM=pontomedullary membrane, RM=rhomboid membrane, SCM=superior cerebellar membrane, tent.=tentorium, TrM=trigeminal membrane, VA=vertebral artery.

© De Gruyter