21. The life cycle begins in infected meningeal tissues in the central nervous system where adult worms lay eggs. 22. From there on, umbellulone is able to reach the perivascular sensory nerve endings of the meningeal vessels. 23. Subsequent experiments revealed that meningeal lymphatic vessels absorb cerebrospinal fluid and drain into the deep cervical lymph nodes. 24. Importantly, the meningeal lymphatics present several unique attributes that differentiate them from lymphatic vessels in peripheral organs. 25. They pierce the arachnoid matter and the meningeal layer in the dura and drain into the cranial venous sinuses. 26. Malignant cells carried in the CSF may spread ( rarely ) to the spinal cord or cause meningeal gliomatosis. 27. He and his colleagues also demonstrated that JCV can infect meningeal and choroid plexus cells and cause JCV meningitis. 28. A posterior meningocele ( pronounced ) or meningeal cyst ( pronounced ) is the least common form of spina bifida. 29. Evidence from Canada seems to support this since the western distribution of meningeal worm has changed little since the 1960s. 30. Feigenbaum F1, Henderson FC . Giant sacral meningeal diverticula : surgical implications of the " thecal tip " sign.