Origin
The pyramidal eminence of the tympanic cavity.
Insertion
Stapes
Blood supply
Stapedial branch of the posterior auricular artery.
Nerve supply
Facial nerve.
Action
It pulls the neck of the stapes bone when there is a loud sound, to reduce the excessive vibration and protect the inner ear.
Disease/Injury
Hyperacusis occurs when there is injury to the nerve supplying this muscle. Hyperacusis means normal sounds are perceived very loudly.
Muscle Exercise
NA
Interesting facts
It is the smallest muscle of the human body. This muscle is only 1 mm in length.
