Perilymphatic duct

Perilymphatic duct is a part of the inner ear that is involved in the circulation of perilymph, a fluid that fills the space between the bony labyrinth and the membranous labyrinth of the ear. The perilymphatic duct is also known as the endolymphatic duct or aqueduct of cochlea, and it connects the scala tympani of the cochlea to the subarachnoid space.

Etymology

The term "perilymphatic" is derived from the Greek words "peri," meaning around or surrounding, and "lymphatic," referring to the clear fluid that circulates through the lymphatic system. The term "duct" comes from the Latin "ductus," meaning a leading or conducting, and refers to a tube or channel for the passage of fluids.

Structure and Function

The perilymphatic duct is a small, narrow tube that extends from the scala tympani of the cochlea to the subarachnoid space. It is responsible for draining the perilymph from the inner ear into the subarachnoid space, where it is reabsorbed into the bloodstream. This helps to maintain the correct pressure and volume of perilymph in the inner ear, which is essential for normal hearing and balance.

Related Terms

• Inner ear: The innermost part of the ear, containing the cochlea, vestibule, and semicircular canals.
• Perilymph: A fluid that fills the space between the bony labyrinth and the membranous labyrinth of the ear.
• Bony labyrinth: A complex system of passages in the inner ear, filled with perilymph.
• Membranous labyrinth: A system of membrane-covered tubes and sacs within the bony labyrinth, filled with endolymph.
• Scala tympani: A spiral-shaped cavity in the cochlea, filled with perilymph.
• Cochlea: A spiral-shaped part of the inner ear, responsible for hearing.
• Subarachnoid space: A space between the arachnoid mater and pia mater of the brain and spinal cord, filled with cerebrospinal fluid.