Definition

Noun: 1. An opening in the bony wall of the cochlea, covered by a membrane and connected to the base of the stapes (stirrup bone) of the middle ear: It is one of the two openings (the other being the round window) from the middle ear into the inner ear. Vibrations of the stapes against the membrane of the oval window transmit sound waves into the fluid of the inner ear.

Usage

• The oval window is a critical structure in the chain of auditory ossicles, allowing mechanical sound vibrations to enter the fluid-filled cochlea.
• In otosclerosis, abnormal bone growth can fix the stapes to the oval window, causing conductive hearing loss.
• The vibration of the stapes footplate creates waves in the perilymph by pushing on the membrane of the oval window.

Advanced Usage

• Anatomical relationships: The term is used to describe precise anatomical positioning, e.g., "The footplate of the stapes is seated in the oval window."
• Pathological contexts: Used when discussing diseases or surgical procedures involving the middle and inner ear, such as stapedectomy, which involves operating on the stapes and oval window.

Variants and Related Words

• Fenestra ovalis: The full Latin anatomical term for the oval window.
• Round window (fenestra cochleae): The other, membrane-covered opening in the cochlea that allows fluid displacement.
• Stapes: The stirrup-shaped bone whose footplate attaches to the oval window.
• Cochlea: The spiral-shaped, fluid-filled organ of hearing in the inner ear, into which the oval window leads.

Synonyms

• Fenestra vestibuli: A synonym used in formal anatomical terminology, emphasizing its connection to the vestibule of the inner ear.

Related Phrases/Concepts

• Oval window niche: The recess in the middle ear wall where the oval window is located.
• Oval window membrane: The thin, flexible tissue that covers the opening and transmits vibrations.

Noun

1. fenestra that has the base of the stapes attached to it