ACB 8120 Lecture Notes - Lecture 11: Endolymphatic Duct, Endolymphatic Sac, Otitis Media
12 Apr 2020
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Explain the anatomy of middle ear infection and which regions have potential to spread to ear. Typically follows an upper respiratory infection (bacteria crawls up the pharyngotympanic tube into the middle ear where it is moist, warm and closed, to begin infection) Tympanostomy tubes (by cutting through the tympanic membrane. Describe the anatomical structures of the inner ear. Vestibule contains utricle and saccule (in between semicircular canals and cochlea; entry way) Blood supply: labyrinthine artery (branch of vertebral basilar a. ) Discriminate between endolymph and perilymph in terms of their origin, composition and reabsorption mechanisms. Spaces around ducts (called bony labyrinth) are filled with perilymph. Both fluids are constantly produced and recycled (similarly to the aqueous humor of the eye). They are returned to the circulation through assigned ducts: Endolymphatic duct -> endolymphatic sac -> subdural space (near dura matter) Perilymphatic duct -> subarachnoid space (where perilymph combines with csf) Similar to extracellular fluid . dumped into csf via.
