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.
Accessory Structures â¢ Lacrimal apparatus â Each eye has a lacrimal apparatus. A lacrimal apparatus consists of the â¢ (1) lacrimal gland and â¢ (2) the structures which drain the secretions (tears) from the lacrimal apparatus. â Each lacrimal gland is located superiorly and laterally to each eyeball.igure 18.3 A lacrimal apparatus consists of the (1) lacrimal gland and (2) the structures which drain the secretions (tears) from the lacrimal apparatus. Accessory Structures â¢ Extrinsic eye muscles The six muscles which move the eyeball are called the extrinsic eye muscles.