sinus tympani


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tym·pan·ic si·nus

[TA]
a depression in the tympanic cavity posterior to the tympanic promontory.
Synonym(s): sinus tympani [TA]

sinus tympani

A recess in the medial wall of the tympanic cavity beside the promontory and adjacent to the round window. The sinus tympani can be > 3 mm deep.
See also: sinus
References in periodicals archive ?
The paint mark in the sinus tympani was placed by reversing the orientation of the temporal bone, which allowed for better visualization of the posterior tympanic cavity.
More notable is the finding that ICWM with otoendoscopy was superior to CWDM in providing visualization of the sinus tympani.
For instance, the facial canal, which lies in the lateral wall of the sinus tympani, may protrude into the sinus to form a recess under the nerve.
Removal of the middle or inferior portion of the posterior canal wall can increase the amount of exposure to the hypotympanum and to the region of the sinus tympani.