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Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)
| Stapedius | ||
|---|---|---|
 | ||
| The medial wall and part of the posterior and anterior walls of the right tympanic cavity, lateral view. | ||
| Gray's | subject #230 | |
| Origin: | walls of pyramidal eminence | |
| Insertion: | neck of stapes | |
| Blood: | ||
| Nerve: | facial nerve | |
| Action: | ||
The stapedius is the smallest striated muscle in the human body. At just over one millimeter in length, its purpose is to stabilize the smallest bone in the body, the stapes. It prevents excess movement by the stapes, helping to control the conduction of sound waves from the external environment to the inner ear: compare the role of the tensor tympani muscle. Paralysis of the stapedius allows wider oscillation of the stapes, resulting in heightened reaction of the auditory ossicles to sound vibration. Loud noises become deafening.
The stapedius is innervated by a branch of Cranial Nerve VII, the facial nerve.
External links[]
Sensory system: Auditory and Vestibular systems (TA A15.3, GA 10.1029) | |||||||||||||||
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| Outer ear |
Pinna (Helix, Antihelix, Tragus, Antitragus, Incisura anterior auris, Earlobe) • Ear canal • Auricular muscles | ||||||||||||||
| Middle ear |
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| Inner ear/ (membranous labyrinth, bony labyrinth) |
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| This page uses Creative Commons Licensed content from Wikipedia (view authors). |
- fr:Muscle de l'étrier
- fi:Jalustinlihas
- id:Otot stapedius
- nl:Musculus stapedius