Bickerstaff's encephalitis is a rare inflammatory disorder of the central nervous system, first described by Edwin Bickerstaff in 1951. It may also affect the peripheral nervous system, and has features in common with both Miller Fisher syndrome and GuillainâBarrÃ© syndrome. 1  1 Signs and symptoms.  2 Pathophysiology.
Pathophysiology. Tears are produced in the lacrimal gland and drain through the upper and lower puncta into the canaliculi and then into the lacrimal sac and nasolacrimal duct (see Figure: Anatomy of the lacrimal system. ). Obstruction of tear drainage can lead to stasis and infection.
â¢ Lacrimal Apparatus What is the opening between the upper and lower lid called? Lacrimal Apparatus â¢ Lacrimal Apparatus âLacrimal gland âlocated under the frontal bone at upperâouter angle of the orbit âLacrimal canals/ducts (6â12) âConjunctival sac âPuncta (um)â¦drainage ports (2 ea eye) âCanaliculi (us) âLacrimal sac âNasolacrimal duct âdrains into the nose